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Scawtite

A valid IMA mineral species
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00873720017271926388176.jpg
Scawtite

Commercial Quarry, Sky Blue Hill, Crestmore quarries, Crestmore, Jurupa Valley, Riverside County, California, USA
00064570017271926417509.jpg
Scawtite, etc.

Christmas Mine, Christmas, Banner Mining District, Gila County, Arizona, USA
02547380017271926441376.jpg
Scawtite, etc.

Zeilberg Quarry, Maroldsweisach, Haßberge District, Lower Franconia, Bavaria, Germany
00873720017271926388176.jpg
Scawtite

Commercial Quarry, Sky Blue Hill, Crestmore quarries, Crestmore, Jurupa Valley, Riverside County, California, USA
00064570017271926417509.jpg
Scawtite, etc.

Christmas Mine, Christmas, Banner Mining District, Gila County, Arizona, USA
02547380017271926441376.jpg
Scawtite, etc.

Zeilberg Quarry, Maroldsweisach, Haßberge District, Lower Franconia, Bavaria, Germany
00873720017271926388176.jpg
Scawtite

Commercial Quarry, Sky Blue Hill, Crestmore quarries, Crestmore, Jurupa Valley, Riverside County, California, USA
00064570017271926417509.jpg
Scawtite, etc.

Christmas Mine, Christmas, Banner Mining District, Gila County, Arizona, USA
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About ScawtiteHide

06199440017271926499928.jpg
Scawt Hill

Scawt Hill, Larne, County Antrim, Northern Ireland, UK
Formula:
Ca7(Si3O9)2CO3 · 2H2O
Colour:
Colourless
Lustre:
Vitreous
Hardness:
4½ - 5
Specific Gravity:
2.71
Crystal System:
Monoclinic
Name:
Named by Cecil Edgar Tilley (Professor of Petrology and Geology at Cambridge University) in 1930 after its discovery locality, Scawt Hill, Larne, Co. Antrim, Northern Ireland, UK.
This page provides mineralogical data about Scawtite.


Unique IdentifiersHide

Mindat ID:
3552
Long-form identifier:
mindat:1:1:3552:7

IMA Classification of ScawtiteHide

IMA status:
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Ca7(Si3O9)2(CO3) · 2H2O
First published:
1930
Type description reference:
Tilley, C. E. (1930) Scawtite, a new mineral from Scawt Hill, Co. Antrim. Mineralogical Magazine and Journal of the Mineralogical Society, 22 (128) 222-224 doi:10.1180/minmag.1930.022.128.03

Classification of ScawtiteHide

Strunz-mindat (2026):
9.CK.15

9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
Dana 8th ed.:
64.2.1.1

64 : CYCLOSILICATES Rings with Other Anions and Insular Silicate Groups
2 : Rings with Other Anions and Insular Silicate Groups: 3-membered rings with other anion groups
Hey's CIM Ref.:
17.4.4

17 : Silicates Containing other Anions
4 : Silicates with carbonates

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
ScwIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of ScawtiteHide

Lustre:
Vitreous
Transparency:
Transparent
Colour:
Colourless
Hardness:
4½ - 5 on Mohs scale
Cleavage:
Imperfect/Fair
{010} fair
{100} poor
Density:
2.71 g/cm3 (Measured)    2.74 g/cm3 (Calculated)

Optical Data of ScawtiteHide

Type:
Biaxial (+)
RI values:
nα = 1.597 - 1.603 nβ = 1.606 - 1.609 nγ = 1.618 - 1.621
2V:
Measured: 74° to 78°, Calculated: 74°
Max. Birefringence:
δ = 0.018 - 0.021
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.

Surface Relief:
Moderate
Dispersion:
r < v weak

Chemistry of ScawtiteHide

Mindat Formula:
Ca7(Si3O9)2CO3 · 2H2O
Element Weights:
Element% weight
O44.171 %
Ca33.675 %
Si20.228 %
C1.442 %
H0.484 %

Calculated from ideal end-member formula.
Elements listed:
C, Ca, H, O, Si - search for minerals with similar chemistry
Common Impurities:
Ti,Al,Fe,Mn,Mg

Chemical AnalysisHide

Crystallography of ScawtiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 10.118(3) Å, b = 15.187(4) Å, c = 6.626(1) Å
β = 100.55(2)°
Ratio:
a:b:c = 0.666 : 1 : 0.436
Unit Cell V:
1,000.95 ų (Calculated from Unit Cell)
Z:
2
Morphology:
parallel to slightly divergent aggregates
Comment:
Space Group: I2/m:

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000391ScawtitePluth J J, Smith J V (1973) The crystal structure of scawtite Note sample is from Crestmore, California, USA American Mineralogist 58 1097-109719730293
0006058ScawtiteGrice J D (2005) The structure of spurrite, tilleyite and scawtite, and relationships to other silicate-carbonate minerals The Canadian Mineralogist 43 1489-15002005Scawt Hill, near Larne, County Antrim, Ireland0293
0020470ScawtiteZhang L, Fu P, Yang H, Yu K, Zhou Z (1992) Crystal structure of Scawtite Chinese Science Bulletin 37 930-9341992Zoulou iron deposit, Anhui Province, China0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.04 Å(10)
1.898 Å(6)
2.495 Å(5)
2.24 Å(5)
4.56 Å(4)
2.79 Å(4)
6.05 Å(3)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47)
High-? alteration and/or metamorphism
31 : Thermally altered carbonate, phosphate, and iron formations

Type Occurrence of ScawtiteHide

Other Language Names for ScawtiteHide

Dutch:Scawtiet
German:Scawtit
Simplified Chinese:片柱钙石
Spanish:Scawtita

Common AssociatesHide

Associated Minerals Based on Photo Data:
7 photos of Scawtite associated with TobermoriteCa5Si6O17 · 5H2O
4 photos of Scawtite associated with PlombièriteCa5Si6O16(OH)2 · 7H2O
4 photos of Scawtite associated with SpinelMgAl2O4
4 photos of Scawtite associated with ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2O
3 photos of Scawtite associated with XonotliteCa6(Si6O17)(OH)2
3 photos of Scawtite associated with GehleniteCa2Al[AlSiO7]
3 photos of Scawtite associated with LarniteCa2SiO4
2 photos of Scawtite associated with StringhamiteCaCu(SiO4) · H2O
1 photo of Scawtite associated with Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
1 photo of Scawtite associated with JenniteCa9(Si3O9)2(OH)8 · 8H2O

Related Minerals - Strunz-mindat GroupingHide

9.CK.AdachiiteCaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.Magnesio-dutrowiteNa(Mg2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.DarrellhenryiteNa(Al2Li)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.Fluor-schorlNaFe2+3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.PrincivalleiteNa(Mn2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.Alumino-oxy-rossmanite◻Al3Al6(Si5AlO18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.DutrowiteNa(Fe2+2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.Ferro-bosiiteNaFe3+3(Al4Fe2+2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.BosiiteNaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.Celleriite◻(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05FeruviteCaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Chromium-draviteNaMg3Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Fluor-rossmanite◻(Al2Li)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m (3 2/m) : R3m
9.CK.05Oxy-schorlNa(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Fluor-elbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05DraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Oxy-uviteCaMg3Al6(Si6O18)(BO3)3(OH)3O
9.CK.05Fluor-uviteCaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Foitite◻(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Vanadio-oxy-draviteNaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Fluor-buergeriteNaFe3+3Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
9.CK.05Unnamed (F analogue of feruvite)CaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3F
9.CK.05ErtliteNaAl3Al6(Si4B2O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05TsilaisiteNaMn2+3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05UviteCaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Fluor-tsilaisiteNaMn2+3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Oxy-foitite◻(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m (3 2/m) : R3m
9.CK.05LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Vanadio-oxy-chromium-draviteNaV3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
9.CK.05Rossmanite◻(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Oxy-vanadium-draviteNaV3(V4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05OleniteNaAl3Al6(Si6O18)(BO3)3O3(OH)Trig. 3m : R3m
9.CK.05UM2000-64-SiO:BFeHKMg(K,Na)Fe3+3(Mg2Fe3+4)Si6O18(BO3)3(OH)3O
9.CK.05Magnesio-lucchesiiteCaMg3Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05PovondraiteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05LucchesiiteCaFe2+3 Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Chromo-alumino-povondraiteNaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Fluor-draviteNaMg3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Oxy-draviteNa(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Oxy-chromium-draviteNaCr3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
9.CK.05Luinaite-(OH)NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)Mon. m : Bm
9.CK.05SchorlNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Magnesio-foitite◻(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05MaruyamaiteK(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.10Abenakiite-(Ce)Na26Ce6(Si6O18)(PO4)6(CO3)6(SO2)OTrig. 3 : R3
9.CK.20Thorosteenstrupine(Ca,Th,Mn)3Si4O11F · 6H2O
9.CK.20Steenstrupine-(Ce)Na14Mn2+2Fe3+2Ce6Zr(Si6O18)2(PO4)6(PO3OH)(OH)2 · 2H2OTrig. 3m (3 2/m) : R3m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for ScawtiteHide

References for ScawtiteHide

Reference List:
Tilley, C. E. (1930) Scawtite, a new mineral from Scawt Hill, Co. Antrim. Mineralogical Magazine and Journal of the Mineralogical Society, 22 (128) 222-224 doi:10.1180/minmag.1930.022.128.03
Foshag, W. F. (1935) New mineral names. American Mineralogist, 20 (5). 403-404
Murdoch, Joseph (1955) Scawtite from Crestmore, California. American Mineralogist, 40 (5-6). 505-509
McConnell, J. D. C. (1955) A chemical, optical and x-ray study of scawtite from Ballycraigy, Larne, N. Ireland. American Mineralogist, 40 (5-6) 510-514
McConnell, Duncan, Murdoch, Joseph (1958) The crystal chemistry of scawtite. American Mineralogist, 43 (5-6) 498-502
Harker, R. I. (1965) Scawtite and its synthesis. Mineralogical Magazine and Journal of the Mineralogical Society, 34 (268). 232-236 doi:10.1180/minmag.1965.034.268.18
Pluth, J. J., Smith, J. V. (1973) The crystal structure of scawtite, Ca7(Si6O18)(CO3).2H2O. Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 29 (1). 73-80 doi:10.1107/s0567740873002001
Zhang, L., Fu, P., Yang, H., Yu, K., and Zhou, Z. (1992) Crystal structure of scawtite. Chinese Sci. Bulletin: 37: 930-934.
Jambor, John L., Grew, Edward S. (1994) New Mineral Names. American Mineralogist, 79 (3-4) 387-391
(2001) Scawtite. Handbook of Mineralogy. Mineralogical Society of America
Grice, J. D. (2005) The structure of spurrite, tilleyite and scawtite, and relationships to other silicate-carbonate minerals. The Canadian Mineralogist, 43 (5). 1489-1500 doi:10.2113/gscanmin.43.5.1489

Localities for ScawtiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Australia
 
  • Tasmania
    • Huon Valley municipality
      • Huon-Channel region
        • Weld river district
Bottrill et al. (2008)
China
 
  • Anhui
    • Huaibei
      • Suixi Co.
Liming Zhang et al. (1991)
  • Hebei
    • Handan
      • She County
Cao Zhengmin et al. (1987)
Cuba
 
  • Cienfuegos Province
Chukanov (2014)
Germany
 
  • Bavaria
    • Lower Franconia
      • Haßberge District
        • Maroldsweisach
Tron et al. (1987)
Hungary
 
  • Veszprém County
    • Sümeg District
      • Sümeg
Kónya-MÁFI
Indonesia
 
  • West Java Province
Newman (1973)
Ireland
 
  • Connacht
    • Sligo County
      • Killala Bay
Bull. Soc. Franç. Minéralo. ...
Italy
 
  • Veneto
    • Vicenza Province
      • Altissimo
        • Tesoro Mountain
Boscardin et al. (2011)
      • Cornedo Vicentino
        • Spagnago
50 +2 other references
      • Rotzo
Collections Alessandro Mattiello and ... +1 other reference
      • Schio
        • Tretto
          • Val Munari
            • Contrade Maglio-Pornaro
Mattioli et al. (2014)
Japan
 
  • Fukushima Prefecture
Matsuyama (2001)
  • Hiroshima Prefecture
    • Shoubara City
3 +2 other references
Yamada (2004)
  • Okayama Prefecture
    • Takahashi City
      • Bitchū
        • Fuka
Kusachi et al. (1991) +1 other reference
New Zealand
 
  • Northland Region
    • Kaipara District
Mason (1957) +1 other reference
Baker et al. (1980)
Norway
 
  • Telemark
    • Skien
Jamtveit et al. (1997)
Poland
 
  • Lower Silesian Voivodeship
    • Kłodzko County
      • Gmina Nowa Ruda
        • Przygórze
          • Bolesław Mine
Łukasz Kruszewski PXRD data
Romania
 
  • Hunedoara County
    • Vaţa de Jos
      • Cerboia Valley
Marincea +2 other references
UK
 
  • Northern Ireland
    • County Antrim
McConnell (1954) +3 other references
      • Larne
        • Glenoe
Henmi et al. (1973)
Tilley (1930) +2 other references
  • Scotland
    • Highland
      • Fort William and Ardnamurchan
        • Ardnamurchan
Agrell (1965)
USA
 
  • Arizona
    • Gila County
      • Banner Mining District
        • Christmas
Anthony et al. (1995)
  • California
    • Riverside County
      • Jurupa Valley
        • Crestmore
Murdoch (1955) +1 other reference
            • Sky Blue Hill
Murdoch (1954) +3 other references
  • Montana
    • Cascade County
      • Neihart Mining District (Montana Mining District)
Taylor (1935) +2 other references
Quick NavTopAbout ScawtiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Chemical AnalysisCrystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
 
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