Claraite Mineral Data

General Claraite Information

Chemical Formula:

(Cu,Zn)3(CO3)(OH)4•4(H2O)

Composition:

Molecular Weight = 392.58 gm

Zinc 16.66 % Zn 20.73 % ZnO

Copper 32.37 % Cu 40.52 % CuO

Hydrogen 3.08 % H 27.53 % H₂O

Carbon 3.06 % C 11.21 % CO₂

Oxygen 44.83 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₂Zn(CO₃)(OH)₄•4(H₂O)

Environment:

Secondary mineral.

IMA Status:

Approved IMA 1982

Locality:

Clara Mine, Black Forest, Wolfach, Schwarzwald, Baden-Wï¿½rttemberg, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Claraite Image

Images:

Claraite

Comments: Green, round spherical grain of claraite on fluorite.
Location: Clara Mine, Oberwolfach, Wolfach Valley, Black Forest, Baden-WÃ¼rttemberg, Germany. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Claraite Crystallography

Axial Ratios:

a:b:c =1.7783:1:0.9053

Cell Dimensions:

a = 14.28, b = 8.03, c = 7.27, Z = 4; alpha = 79.16°, beta = 107.9°, gamma = 99.68° V = 768.04 Den(Calc)= 3.39

Crystal System:

Triclinic Space Group: P1 or P1

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

By Intensity(I/I_o): 13.47(1)(100), 7.84(0.9)(010), 3.65(0.8)(120,021),2.96(0.6)(410,211,4115.17(0.6)(2

Physical Properties of Claraite

Cleavage:

{1010} Perfect

Color:

Blue.

Density:

3.35

Diaphaneity:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

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

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Optical Properties of Claraite

Dichroism (e):

colorless or colorless.

Dichroism (w):

pale green or bluish green.

Gladstone-Dale:

CI meas= 0.048 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.054 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2071,KPDmeas= 0.2084,KC= 0.2189
Ncalc = 1.73 - 1.74

Optical Data:

Uniaxial (-), e=1.645, w=1.751, bire=0.1060.

Calculated Properties of Claraite

Electron Density:

Bulk Density (Electron Density)=3.31 gm/cc
note: Specific Gravity of Claraite =3.35 gm/cc.

Fermion Index:

Fermion Index = 0.0073854748
Boson Index = 0.9926145252

Photoelectric:

PE_Claraite= 21.99 barns/electron
U=PE_Claraite x rElectron Density= 72.80 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Claraite is Not Radioactive

Claraite Classification

Dana Class:

16b.04.03.01 (16b)Carbonates - Hydroxyl or Halogen

(16b.04)where (A)m (B)n (XO3)p Zq ï¿½ x(H2O), with (m+n):p=8:1

(16b.04.03)Dana Group

16b.04.03.01 Claraite (Cu,Zn)3(CO3)(OH)4•4(H2O) P1 or P1 Tri

Strunz Class:

05.DA.30 05 - CARBONATES (NITRATES)

05.D - Carbonates with Additional Anions, with H2O

05.DA -With medium-sized cations

05.DA.30 Claraite (Cu,Zn)3(CO3)(OH)4•4(H2O) P1 or P1 Tri

Other Claraite Information

References:

NAME( Dana8) PHYS. PROP.(AmMin, Vol 88, p 254) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Claraite :
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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Print or Cut-and-Paste your Claraite Specimen Label here :

Claraite

(Cu,Zn)3(CO3)(OH)4•4(H2O)
Dana No: 16b.04.03.01 Strunz No: 05.DA.30
Locality:

Notes:

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