Mineralogy Database

Keyite Mineral Data

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General Keyite Information

Help on Chemical  Formula: Chemical Formula: Cu++3(Zn,Cu)4Cd2(AsO4)6•2(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Cu3.6Zn3.3Cd1.7Mn3+0.2Ca0.1(AsO4)6•2(H2O)
Help on Environment: Environment: Secondary mineral in the oxidized zone of a dolostone-hosted hydrothermal polymetallic ore deposit.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Tsumeb, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Charles Locke Key (1935-), Canton, Connecticut, USA, American mineral dealer who furnished the first specimens.
Help on Name Pronunciation: Name Pronunciation: Keyite Say KEYITE
Help on Synonym: Synonym: ICSD 82482
  PDF 29-256

Keyite Image

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Comments: Brilliant blue keyite crystals on a matrix of white, metallic suflide-arsenide ore.
Location: Tsumeb, Namibia. Scale: 0.9 x 0.7 x 0.7 cm.
© Rob Lavinsky

Keyite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9118:1:0.5352
Help on Cell Dimensions: Cell Dimensions: a = 11.654, b = 12.78, c = 6.84, Z = 2; beta = 99.11° V = 1,005.89 Den(Calc)= 5.02
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: I2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.795(1), 2.876(0.9), 3.29(0.9),

Physical Properties of Keyite

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: Azure.
Help on Density: Density: 4.95
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Streak: Streak: light blue

Optical Properties of Keyite

Help on Gladstone-Dale: 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
Ncalc = 1.85 - 1.86
Help on Optical Data: Optical Data: Biaxial (?), a=1.8, g=1.87, bire=0.0700
Help on Pleochroism (x): Pleochroism (x): pale blue.
Help on Pleochroism (y): Pleochroism (y): greenish blue.
Help on Pleochroism (z): Pleochroism (z): deep blue.

Calculated Properties of Keyite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.57 gm/cc
note: Specific Gravity of Keyite =4.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEKeyite = 67.96 barns/electron
U=PEKeyite x rElectron Density= 310.71 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Keyite is Not Radioactive

Keyite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.03)(A+ B++)3 (XO4)2
  (38.03.08)Dana Group Keyite Cu3(Zn,Cu)4Cd2(AsO4)6•2(H2O) I2/a 2/m
Help on  Strunz Class: Strunz Class: 08.CA.50 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CA -With small and large/medium cations
08.CA.50 Keyite Cu3(Zn,Cu)4Cd2(AsO4)6•2(H2O) I2/a 2/m

Other Keyite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Keyite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.CA.50





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