Conichalcite Mineral Data

Conichalcite Mineral Data +

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General Conichalcite Information

Chemical Formula:

CaCu(AsO4)(OH)

Composition:

Molecular Weight = 259.55 gm

Calcium 15.44 % Ca 21.61 % CaO

Copper 24.48 % Cu 30.65 % CuO

Arsenic 28.87 % As 44.28 % As₂O₅

Hydrogen 0.39 % H 3.47 % H₂O

Oxygen 30.82 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaCu(AsO₄)(OH)

IMA Status:

Valid Species (Pre-IMA) 1849

Locality:

Link to MinDat.org Location Data.

Synonym:

Higginsite

ICSD 64694

PDF 37-448

Conichalcite Image

Images:

Click Here for Larger Conichalcite Image

Conichalcite Willemite

Comments: Conichalcite with willemite.
Location: Collected from the 30 level of the Tsumeb mine. Tsumeb, Namibia. Scale: 2.1 x 1.5 cm.
© John Veevaert

Images:

Conichalcite Cornubite

Comments: Blue green crystalline cornubite alteration of enargite with green conichalcite in white calcite.
Location: Lime Bluff Quarry, Lycoming County, Pennsylvania, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Conichalcite Crystallography

Axial Ratios:

a:b:c =0.7994:1:0.6297

Cell Dimensions:

a = 7.382, b = 9.234, c = 5.815, Z = 4; V = 396.38 Den(Calc)= 4.35

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

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

By Intensity(I/I_o): 2.842(1), 3.118(0.9), 2.594(0.5),

Forms:

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Forms: [ 8 2 5] [ 0 1 1] [ 0 2 1] [ 1 1 1] [ 2 2 1] [ 0 4 1] [ 2 0 3] [ 1 1 0] [ 2 0 1] [ 0 0 1]

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Crystal Structure:

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Qurashi M M , Barnes W H , The Canadian Mineralogist , 7 (1963) p.561-577, The structures of the minerals of the descloizite and adelite groups:, IV - desclozite and conichalcite (part 2) The structure of conichalcite

Physical Properties of Conichalcite

Cleavage:

None

Color:

Yellow green, Emerald green.

Density:

4.1

Diaphaniety:

Subtranslucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Magnetism:

Nonmagnetic

Streak:

light green

Optical Properties of Conichalcite

Gladstone-Dale:

CI meas= -0.072 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1829,KPDmeas= 0.194,KC= 0.181

Optical Data:

Biaxial (+/-), a=1.73-1.8, b=1.795-1.831, g=1.771-1.846, bire=0.0410-0.0460

Calculated Properties of Conichalcite

Electron Density:

r_electron=4.12 gm/cc
note: r_Conichalcite=4.35 gm/cc.

Fermion Index

Fermion Index = 0.00035
Boson Index = 0.99965

Photoelectric:

PE_Conichalcite= 32.59 barns/electron
U=PE_Conichalcite x r_electron= 134.37 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Conichalcite is Not Radioactive

Conichalcite Classification

Dana Class:

41.5.1.2 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.5)where (A B)2 (XO4) Zq

(41.5.1)Dana Group

41.5.1.1 Adelite CaMg(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.2 Conichalcite CaCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.3 Austinite CaZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.4 Duftite-beta PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.5 Gabrielsonite PbFe(AsO4)(OH) P 2₁m mm2

41.5.1.6 Tangeite CaCu(VO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.7 Nickelaustinite Ca(Ni,Zn)(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.8 Cobaltaustinite CaCo(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.9 Arsendescloizite PbZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.10 Gottlobite! CaMg(VO4,AsO4)(OH) P 2₁2₁2₁ 2 2 2

Strunz Class:

VII/B.26-50 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.26 - Adelite - Duftite group

VII/B.26-10 Adelite CaMg(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-15 Gottlobite! CaMg(VO4,AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-20 Nickelaustinite Ca(Ni,Zn)(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-30 Cobaltaustinite CaCo(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-40 Austinite CaZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-50 Conichalcite CaCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-60 Tangeite CaCu(VO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-70 Gabrielsonite PbFe(AsO4)(OH) P 2₁m mm2

VII/B.26-80 Duftite-alpha PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-80* Duftite-beta PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

Other Conichalcite Information

References:

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

See Also:

Links to other databases for Conichalcite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST
18 - YupRocks

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Conichalcite

CaCu(AsO4)(OH)
Dana No: 41.5.1.2 Strunz No: VII/B.26-50
Locality:

Notes: