Wallkilldellite
A valid IMA mineral species
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About Wallkilldellite
Wallkill Valley, USA
Formula:
Ca2Mn2+3(AsO4)2(OH)4 · 9H2O
Colour:
Dark red to nearly black
Lustre:
Resinous, Pearly
Hardness:
3
Specific Gravity:
2.85
Crystal System:
Hexagonal
Name:
Named in 1983 by Pete J. Dunn and Donald Ralph Peacor for its discovery locality, the Sterling Mine in the Wallkill Dell (Wallkill Valley), Ogdensburg, New Jersey, USA. No suffix for the manganese dominance was added by the IMA. Any entries that use "-(Mn)" are in error.
Unique Identifiers
Mindat ID:
4237
Long-form identifier:
mindat:1:1:4237:2
Similar Names
| Wallkilldellite-(Fe) | A valid IMA mineral species | (Ca,Cu)4Fe62+(AsO4,SiO4)4(OH,O)8 · 18H2O |
IMA Classification of Wallkilldellite
Approved
Approval year:
1982
First published:
1983
Classification of Wallkilldellite
8.DL.20
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
L : With large and medium-sized cations, (OH, etc.):RO4 = 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
L : With large and medium-sized cations, (OH, etc.):RO4 = 2:1
20.8.16
20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Wlk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Wallkilldellite
Resinous, Pearly
Transparency:
Translucent
Comment:
Vitreous on cleavage surfaces; slightly resinous on fracture surfaces
Colour:
Dark red to nearly black
Streak:
Pale orange
Hardness:
3 on Mohs scale
Cleavage:
Perfect
{0001}
{0001}
Density:
2.85(5) g/cm3 (Measured) 2.90 g/cm3 (Calculated)
Optical Data of Wallkilldellite
Type:
Uniaxial (-)
Pleochroism:
Weak
Comments:
O = reddish orange; E = pale pinkish orange
Chemistry of Wallkilldellite
Mindat Formula:
Ca2Mn2+3(AsO4)2(OH)4 · 9H2O
Element Weights:
Crystallography of Wallkilldellite
Crystal System:
Hexagonal
Cell Parameters:
a = 6.506(7) Å, c = 23.49(3) Å
Ratio:
a:c = 1 : 3.611
Unit Cell V:
861.08 ų (Calculated from Unit Cell)
Z:
1
Comment:
Point Group: 6/m 2/m 2/m, 6 m2, or 6mm.: Space Group: P63/mmc, P6 2c, or P63mc.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 11.5 Å | (100) |
| 5.61 Å | (90) |
| 5.05 Å | (10) |
| 4.56 Å | (40) |
| 4.06 Å | (5) |
| 3.92 Å | (2) |
| 3.25 Å | (40) |
| 2.936 Å | (10) |
| 2.844 Å | (60) |
| 2.810 Å | (1) |
| 2.748 Å | (50) |
| 2.545 Å | (50) |
| 2.349 Å | (40) |
| 2.182 Å | (20) |
| 2.136 Å | (30) |
| 2.101 Å | (20) |
| 1.886 Å | (2) |
| 1.794 Å | (5) |
| 1.727 Å | (2) |
| 1.611 Å | (5) |
| 1.492 Å | (2) |
| 1.446 Å | (5) |
| 1.425 Å | (2) |
| 1.341 Å | (5) |
Comments:
ICDD 35-608
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Wallkilldellite
General Appearance of Type Material:
Flattened, radial clusters of platy crystals without obvious morphological characteristics other than the extremely platy habit. Crystal size is approximately 0.1 mm and aggregates to 0.5 mm.
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, 113445; National Museum of Natural History, Washington, D.C., USA, 149767.
Geological Setting of Type Material:
Massive, granular, franklinite/willemite ore with abundant calcite.
Associated Minerals at Type Locality:
Synonyms of Wallkilldellite
Other Language Names for Wallkilldellite
Relationship of Wallkilldellite to other Species
Structurally related to group(s):
Common Associates
Associated Minerals Based on Photo Data:
| 2 photos of Wallkilldellite associated with Conichalcite | CaCu(AsO4)(OH) |
| 2 photos of Wallkilldellite associated with Cobaltlotharmeyerite | CaCo2(AsO4)2 · 2H2O |
| 1 photo of Wallkilldellite associated with Scheuchzerite | Na(Mn,Mg,Zn)9[VSi9O28(OH)](OH)3 |
| 1 photo of Wallkilldellite associated with Bergslagite | CaBeAsO4(OH) |
| 1 photo of Wallkilldellite associated with Castellaroite | Mn2+3(AsO4)2 · 4H2O |
| 1 photo of Wallkilldellite associated with Mansfieldite | AlAsO4 · 2H2O |
| 1 photo of Wallkilldellite associated with Braunite | Mn2+Mn3+6(SiO4)O8 |
Related Minerals - Strunz-mindat Grouping
| 8.DL.05 | Foggite | CaAl(PO4)(OH)2 · H2O |
| 8.DL.10 | Fluorowardite | NaAl3(PO4)2F2(OH)2(H2O)2 |
| 8.DL.10 | Wardite | NaAl3(PO4)2(OH)4 · 2H2O |
| 8.DL.10 | Millisite | (Na,K)CaAl6(PO4)4(OH)9 · 3H2O |
| 8.DL.10 | Cyrilovite | NaFe3+3(PO4)2(OH)4 · 2H2O |
| 8.DL.15 | Petersite-(Ce) | Cu6Ce(PO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Nd) | NdCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Y) | YCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Ce) | CeCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(Dy) | (Dy,La)Cu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Agardite-(La) | LaCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Petersite-(Y) | (Y,Ce,Nd)Cu6(PO4)3(OH)6 · 3H2O |
| 8.DL.15 | Zálesíite | CaCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O |
| 8.DL.15 | Mixite | BiCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Petersite-(La) | Cu6La(PO4)3(OH)6 · 3H2O |
| 8.DL.15 | Goudeyite | AlCu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.15 | Calciopetersite | CaCu6(PO4)2(PO3OH)(OH)6 · 3H2O |
| 8.DL.15 | Plumboagardite | (Pb,REE,Ca)Cu6(AsO4)3(OH)6 · 3H2O |
| 8.DL.20 | Dugganite | Pb3Zn3(AsO4)2(TeO6) |
| 8.DL.20 | Wallkilldellite-(Fe) | (Ca,Cu)4Fe2+6(AsO4,SiO4)4(OH,O)8 · 18H2O |
| 8.DL.20 | Cheremnykhite | Pb3Zn3(VO4)2(TeO6) |
| 8.DL.20 | Kuksite | Pb3Zn3(PO4)2(TeO6) |
| 8.DL.25 | Angastonite | CaMgAl2(PO4)2(OH)4 · 7H2O |
| 8.DL.30 | Långbanshyttanite | Pb2Mn2Mg(AsO4)2(OH)4 · 6H2O |
Fluorescence of Wallkilldellite
Not fluorescent in UV
Other Information
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 Wallkilldellite
mindat.org URL:
https://www.mindat.org/min-4237.html
Please feel free to link to this page.
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Search Engines:
External Links:
References for Wallkilldellite
Localities for Wallkilldellite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Argentina | |
| Ronald G. Simpson (2017) +1 other reference |
France | |
| Favreau G. et al. (1996) |
| |
Greece | |
| Möckel (2001) |
Italy | |
| AMI UK Service |
| Analyses of Anthony Kampf of Natural ... +1 other reference |
| analysed by Dr. Anthony Kampf |
| Castellaro et al. (2023) |
| Analyses of Anthony Kampf of Natural ... +1 other reference |
| Cámara et al. (2017) |
| Armellino et al. (2019) |
Japan | |
| Matsubara (2001) |
Morocco | |
| Georges FAVREAU collection & EDX ... |
North Macedonia | |
| Đorđević et al. (2021) |
Switzerland | |
| |
| Sorrell (n.d.) |
| Brugger J. (1996) +1 other reference | |
| Lapis 27 (11) +1 other reference |
| Roth et al. (2011) |
| Ansermet (2012) |
| Ansermet (2012) +1 other reference |
USA | |
| Steven Kuitems |
| Steven Kuitems | |
| Heixong Yang | |
| Dunn et al. (1983) +1 other reference |
Monte Nero Mine, Rocchetta di Vara, La Spezia Province, Liguria, Italy