General Wallkilldellite Information
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 Chemical Formula: |
Ca4Mn++6As+++++4O16(OH)8•18(H2O) |
| Composition: |
Molecular Weight = 1,505.95 gm |
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Calcium 10.65 % Ca 14.89 % CaO |
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Manganese 21.89 % Mn 28.26 % MnO |
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Arsenic 19.90 % As 30.52 % As2O5 |
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Hydrogen 2.94 % H 26.32 % H2O |
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Oxygen 44.62 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Ca4Mn2+6As4O16(OH)8•18(H2O) |
| Environment: |
Massive granular franklinite-willemite ore from a metamorphosed stratiform zinc orebody. |
| IMA Status: |
Approved IMA 1983 |
| Locality: |
Sterling Hill, Ogdensburg, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the dell of the Wallkill River, in which both the Sterling Hill and the Franklin deposits were discovered. |
| Name Pronunciation: |
Wallkilldellite + Pronunciation  |
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Wallkilldellite Image |
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Images:
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Wallkilldellite
Comments: Dark red to black tiny crystals in veins in matrix.
Location: Starlera Mine, Val Ferrera, Graubünden, Switzerland.
Scale: Picture Size 1 x 1.5 cm.
© Diederik Visser |
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Wallkilldellite Crystallography
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| Axial Ratios: |
a:c = 1:3.61051 |
| Cell Dimensions: |
a = 6.506, c = 23.49, Z = 1; V = 861.08 Den(Calc)= 2.90 |
| Crystal System: |
Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmc |
| X Ray Diffraction: |
By Intensity(I/Io): 11.5(1), 5.61(0.9), 2.844(0.6), |
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Physical Properties of Wallkilldellite
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| Cleavage: |
{0001} Perfect |
| Color: |
Dark red. |
| Density: |
2.85 |
| Hardness: |
3 - Calcite |
| Luster: |
Vitreous (Glassy) |
| Streak: |
light orange |
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Optical Properties of Wallkilldellite
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| Gladstone-Dale: |
CI meas= -0.131 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.111 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.251,KPDmeas= 0.2554,KC= 0.2259
Ncalc = 1.64 - 1.66 |
| Optical Data: |
Uniaxial (-), w=1.728. |
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Calculated Properties of Wallkilldellite
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| Electron Density: |
Bulk Density (Electron Density)=2.86 gm/cc
note: Specific Gravity of Wallkilldellite =2.90 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0003623103
Boson Index = 0.9996376897 |
| Photoelectric: |
PEWallkilldellite = 19.98 barns/electron
U=PEWallkilldellite x rElectron Density= 57.08 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wallkilldellite is Not Radioactive |
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Wallkilldellite Classification
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| Dana Class: |
42.04.12.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.04)where (AB)5 (XO4)2 Zq � x(H2O) |
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(42.04.12)Wallkilldellite Group |
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42.04.12.01 Wallkilldellite Ca4Mn6As4O16(OH)8•18(H2O) P 6/mmc 6/m 2/m 2/m |
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42.04.12.02 Wallkilldellite-(Fe)! (Ca,Cu)4Fe6[(As,Si)O4]4(OH)8•18(H2O) P 63/mmc, P 63mc, or P 62c Hex
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| Strunz Class: |
08.DL.20 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.D - Phosphates, etc |
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08.DL -With large and medium-sized cations, (OH, etc.):RO4 = 2:1 |
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08.DL.20 Wallkilldellite Ca4Mn6As4O16(OH)8•18(H2O) P 6/mmc 6/m 2/m 2/m |
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08.DL.20 Wallkilldellite-(Fe)! (Ca,Cu)4Fe6[(As,Si)O4]4(OH)8•18(H2O) P 63/mmc, P 63mc, or P 62c Hex |
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08.DL.20 Joelbruggerite! Pb3Zn3SbAs2O13(OH) P 321 3 2 |
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Other Wallkilldellite Information
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| References: |
NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
Links to other databases for Wallkilldellite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
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Print or Cut-and-Paste your Wallkilldellite Specimen Label here :
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Wallkilldellite
Ca4Mn++6As+++++4O16(OH)8•18(H2O)
Dana No: 42.04.12.01 Strunz No: 08.DL.20
Locality:
Notes:
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