Choloalite Mineral Data

Choloalite Mineral Data

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General Choloalite Information

Chemical Formula:

CuPb(Te++++O3)2

Composition:

Molecular Weight = 639.96 gm

Copper 9.93 % Cu 12.43 % CuO

Tellurium 39.88 % Te 49.88 % TeO₂

Hydrogen 0.32 % H 2.82 % H₂O

Lead 32.38 % Pb 34.88 % PbO

Oxygen 17.50 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CuPb(TeO₃)₂·(H₂O)

IMA Status:

Approved IMA 1981

Locality:

Bambollita mine, Moctezuma, Sonora, Mexic. Link to MinDat.org Location Data.

Name Origin:

Named from the Nahua "choloa", evasive, in allusion to the fact that the mineral escaped detection in the mine for many years.

Choloalite Image

Images:

Choloalite Hessite

Comments: Sparse green crusts of choloalite with metallic hessite.
Location: McAlpine Mine, Tuolumne County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Choloalite Crystallography

Cell Dimensions:

a = 12.519, Z = 12; V = 1,962.05 Den(Calc)= 6.50

Crystal System:

IsometricSpace Group: Unk

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

By Intensity(I/I_o): 3.036(1), 3.343(0.6), 7.223(0.5),

Crystal Structure:

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Lam A E , Groat L A , Grice J D , Ercit T S , The Canadian Mineralogist , 37 (1999) p.721-729, The crystal structure of choloalite

Physical Properties of Choloalite

Cleavage:

None

Color:

Dark green.

Density:

6.4

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

3 - Calcite

Luster:

Adamantine

Streak:

green

Optical Properties of Choloalite

Gladstone-Dale:

CI meas= 0.084 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.098 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.16,KPDmeas= 0.1625,KC= 0.1773

Optical Data:

Isotropic, n=2.04.

Calculated Properties of Choloalite

Electron Density:

r_electron=5.46 gm/cc
note: r_Choloalite=6.40 gm/cc.

Fermion Index

Fermion Index = 0.1035
Boson Index = 0.8965

Photoelectric:

PE_Choloalite= 730.87 barns/electron
U=PE_Choloalite x r_electron=3,990.80 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Choloalite is Not Radioactive

Choloalite Classification

Dana Class:

34.2.4.1 (34)Selenites - Tellurites - Sulfites

(34.2)as A++ XO3 · x(H2O)

(34.2.4)Dana Group

34.2.4.1 Choloalite CuPb(TeO3)2 Unk Cubic

Strunz Class:

IV/K.05-30 IV - Oxides

IV/K - Sulfides, selenides, tellurides with [XO3]2- groups and related structures

IV/K.05 - Gravegliaite - sophiite series

IV/K.05-05 Gravegliaite Mn(SO3)·3(H2O) P nma 2/m 2/m 2/m

IV/K.05-10 Hannebachite 2CaSO3·(H2O) Pbna 2/m 2/m 2/m

IV/K.05-15 Orschallite Ca3(SO3)2SO4·12(H2O) R 3c 3 2/m

IV/K.05-20 Graemite CuTeO3·(H2O) Pcmm 2/m 2/m 2/m

IV/K.05-30 Choloalite CuPb(TeO3)2 Unk Cubic

IV/K.05-40 Sophiite Zn2(SeO3)Cl2 Pccn 2/m 2/m 2/m

IV/K.05-70 Burnsite! KCdCu7O2(SeO3)2Cl9 P 6₃/mmc 6/m 2/m 2/m

Other Choloalite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Choloalite :
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 -École des Mines de Paris

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Print or Cut-and-Paste your Choloalite Specimen Label here :

Choloalite

CuPb(Te++++O3)2
Dana No: 34.2.4.1 Strunz No: IV/K.05-30
Locality:

Notes: