Keyite Mineral Data + 
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- 38.3.8.1 Keyite Cu3(Zn,Cu)4Cd2(AsO4)6·2(H2O) I2/a 2/m
- VII/A.09-10 Lammerite Cu3[(As,P)O4]2 P 21/a 2/m
- VII/A.09-20 Stranskiite Zn2Cu(AsO4)2 P1 1
- VII/A.09-30 Keyite Cu3(Zn,Cu)4Cd2(AsO4)6·2(H2O) I2/a 2/m
- VII/A.09-40 Xanthiosite Ni3(AsO4)2 P 21/a 2/m
General Keyite Information |
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 Chemical Formula: |
Cu++3(Zn,Cu)4Cd2(AsO4)6·2(H2O) | ||
| Composition: |
Molecular Weight = 1,520.19 gm | ||
| Calcium 0.26 % Ca 0.37 % CaO | |||
| Manganese 0.72 % Mn 1.04 % Mn2O3 | |||
| Zinc 14.19 % Zn 17.67 % ZnO | |||
| Cadmium 12.57 % Cd 14.36 % CdO | |||
| Copper 15.05 % Cu 16.94 % Cu2O | |||
| Arsenic 29.57 % As 45.36 % As2O5 | |||
| Hydrogen 0.27 % H 2.37 % H2O | |||
| Oxygen 27.36 % O | |||
| ______ ______ | |||
| 100.00 % 98.11 % = TOTAL OXIDE | |||
| Empirical Formula: |
Cu3.6Zn3.3Cd1.7Mn3+0.2Ca0.1(AsO4)6·2(H2O) | ||
| Environment: |
Secondary mineral in the oxidized zone of a dolostone-hosted hydrothermal polymetallic ore deposit. | ||
| IMA Status: |
Approved IMA 1977 | ||
| Locality: |
Tsumeb, Namibia. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Charles Locke Key (1935-), Canton, Connecticut, USA, American mineral dealer who furnished the first specimens. | ||
| Synonym: |
ICSD 82482 | ||
| PDF 29-256 | |||
Keyite Image | |||
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Images:
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Keyite Crystallography |
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| Axial Ratios: |
a:b:c =0.9118:1:0.5352 | ||
| Cell Dimensions: |
a = 11.654, b = 12.78, c = 6.84, Z = 2; beta = 99.11° V = 1,005.89 Den(Calc)= 5.02 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/a | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.795(1), 2.876(0.9), 3.29(0.9), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Keyite |
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| Cleavage: |
[001] Good | ||
| Color: |
Azure. | ||
| Density: |
4.95 | ||
| Diaphaniety: |
Translucent | ||
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | ||
| Habit: |
Tabular - Form dimensions are thin in one direction. | ||
| Hardness: |
3.5-4 - Copper Penny-Fluorite | ||
| Streak: |
light blue | ||
Optical Properties of Keyite |
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| Gladstone-Dale: |
CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1663,KPDmeas= 0.1687,KC= 0.1717 |
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| Optical Data: |
Biaxial (?), a=1.8, g=1.87, bire=0.0700 | ||
| Pleochroism (x): |
pale blue. | ||
| Pleochroism (y): |
greenish blue. | ||
| Pleochroism (z): |
deep blue. | ||
Calculated Properties of Keyite |
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| Electron Density: |
relectron=4.57 gm/cc |
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| Fermion Index |
Fermion Index = 0.03741 Boson Index = 0.96259 |
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| Photoelectric: |
PEKeyite = 67.96 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Keyite is Not Radioactive |
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Keyite Classification |
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| Dana Class: |
38.3.8.1 (38)Anhydrous Phosphates, etc | ||
| (38.3)(A+ B++)3 (XO4)2 | |||
| (38.3.8)Dana Group | |||
| Strunz Class: |
VII/A.09-30 VII - Phosphates, Arsenates and Vanadates | ||
| VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of medium and big size: Mg, Mn,Fe, Cu, Zn, and Ca, Na | |||
| VII/A.09 - Lammerite - Xanthiosite series | |||
Other Keyite Information |
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| References: |
NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4) | ||
| See Also: |
Links to other databases for Keyite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris Search for Keyite using: Visit our Advertisers for Keyite : Translate Keyite Mineral Data : Ask about Keyite here : Print or Cut-and-Paste your Keyite Specimen Label here :
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