Clinoclase Mineral Data

Clinoclase Mineral Data +

General Clinoclase Information

Chemical Formula:

Cu3(AsO4)(OH)3

Composition:

Molecular Weight = 380.58 gm

Copper 50.09 % Cu 62.70 % CuO

Arsenic 19.69 % As 30.20 % As₂O₅

Hydrogen 0.79 % H 7.10 % H₂O

Oxygen 29.43 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₃(AsO₄)(OH)₃

IMA Status:

Valid Species (Pre-IMA) 1868

Locality:

Link to MinDat.org Location Data.

Name Origin:

From the Greek, klineis - "to incline" and klas - "to break."

Synonym:

ICSD 68456

PDF 42-1357

Clinoclase Image

Images:

Clinoclase

Comments: Acicular, radiating crystals of clinoclase.
Location: Majuba Hill mine, Pershing County, Nevada, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Clinoclase

Comments: Divergent, elongated, bladed blue crystals of clinoclase to 1mm on matrix.
Location: Majuba Hill mine, Pershing Co., Nevada, USA. Scale: Picture size 5x7 mm.
© Tom Loomis / Dakota Matrix

Clinoclase Crystallography

Axial Ratios:

a:b:c =1.9259:1:1.1219

Cell Dimensions:

a = 12.48, b = 6.48, c = 7.27, Z = 4; beta = 80.5° V = 579.86 Den(Calc)= 4.36

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 3.587(1), 3.139(0.25), 7.21(0.2),

Forms:

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Forms: [ 2 0 1] [ 1 1 1] [ 3 0 2] [ 1 1 0] [ 1 0 0] [ 0 0 1]

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Crystal Structure:

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Eby R K , Hawthorne F C , Acta Crystallographica, Section C , 46 (1990) p.2291-2294, Clinoclase and the geometry of [5]-coordinate Cu2+ in minerals

Physical Properties of Clinoclase

Cleavage:

[001] Perfect

Color:

Dark verdigris green, Blackish blue green, Blackish green.

Density:

4.19 - 4.4, Average = 4.29

Diaphaniety:

Subtransparent to translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

None.

Luster:

Vitreous - Pearly

Streak:

bluish green

Optical Properties of Clinoclase

Gladstone-Dale:

CI meas= -0.084 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.068 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1919,KPDmeas= 0.1948,KC= 0.1797

Optical Data:

Biaxial (-), a=1.73, b=1.87, g=1.91, bire=0.1800, 2V(Calc)=52, 2V(Meas)=30. Dispersion relatively strong.

Calculated Properties of Clinoclase

Electron Density:

r_electron=4.10 gm/cc
note: r_Clinoclase=4.36 gm/cc.

Fermion Index

Fermion Index = 0.00014
Boson Index = 0.99986

Photoelectric:

PE_Clinoclase= 35.98 barns/electron
U=PE_Clinoclase x r_electron= 147.59 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Clinoclase is Not Radioactive

Clinoclase Classification

Dana Class:

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

(41.3)where (A B)3 (XO4) Zq

(41.3.1)Dana Group

41.3.1.1 Clinoclase Cu3(AsO4)(OH)3 P 2₁/a 2/m

41.3.1.2 Gilmarite! Cu3(AsO4)(OH)3 P1 1

Strunz Class:

VII/B.13-20 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.13 - Pseudomalachite group, Cornetite - Clinoclase series

VII/B.13-10 Cornetite Cu3(PO4)(OH)3 P bca 2/m 2/m 2/m

VII/B.13-20 Clinoclase Cu3(AsO4)(OH)3 P 2₁/a 2/m

VII/B.13-30 Gilmarite! Cu3(AsO4)(OH)3 P1 1

Other Clinoclase Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Clinoclase :
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 - theimage

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

Clinoclase

Cu3(AsO4)(OH)3
Dana No: 41.3.1.1 Strunz No: VII/B.13-20
Locality:

Notes: