Keyite Mineral Data

Keyite Mineral Data +

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General Keyite Information

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:

Cu_3.6Zn_3.3Cd_1.7Mn³⁺_0.2Ca_0.1(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

Images:

Keyite

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

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.795(1), 2.876(0.9), 3.29(0.9),

Crystal Structure:

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Cooper M A , Hawthorne F C , The Canadian Mineralogist , 34 (1996) p.623-630, The crystal structure of keyite, Cu3(Zn,Cu)4Cd2(AsO4)6(H2O)2, an oxysalt mineral, with essential cadmium

Physical Properties of Keyite

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

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

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

Electron Density:

r_electron=4.57 gm/cc
note: r_Keyite=4.95 gm/cc.

Fermion Index

Fermion Index = 0.03741
Boson Index = 0.96259

Photoelectric:

PE_Keyite= 67.96 barns/electron
U=PE_Keyite x r_electron= 310.71 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Keyite is Not Radioactive

Keyite Classification

Dana Class:

38.3.8.1 (38)Anhydrous Phosphates, etc

(38.3)(A+ B++)3 (XO4)2

(38.3.8)Dana Group

38.3.8.1 Keyite Cu3(Zn,Cu)4Cd2(AsO4)6·2(H2O) I2/a 2/m

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

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

Other Keyite Information

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

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Translate Keyite Mineral Data :

Ask about Keyite here :
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Print or Cut-and-Paste your Keyite Specimen Label here :

Keyite

Cu++3(Zn,Cu)4Cd2(AsO4)6·2(H2O)
Dana No: 38.3.8.1 Strunz No: VII/A.09-30
Locality:

Notes: