Gilmarite Mineral Data

General Gilmarite 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

Environment:

Small geodes in narrow carbonate veins. A triclinic polymorph of clinoclase.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Roua deposit, Guillaumes municipality, about 50 km from Nice, France. Link to MinDat.org Location Data.

Name Origin:

Named for Gilbert Mari (1944-), mineralogist at the University of Nice-Sophia Antipolis, France.

Synonym:

ICSD 87869

IMA1996-017

Gilmarite Image

Images:

Gilmarite

Comments: Scanning electron image of prismatic gilmarite crystals (Eur. J. Mineral, 11:549).
Location: Roua deposit, Guillaumes municipality, about 50 km from Nice, France. Scale: Picture size 80 µm.
© Eur. J. Mineral

Gilmarite Crystallography

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

By Intensity(I/I_o): 4.613(1), 3.39(0.6), 4.58(0.5),2.543(0.4), 2.714(0.4), 2.445(0.3),

Physical Properties of Gilmarite

Color:

Greenish blue.

Optical Properties of Gilmarite

Gladstone-Dale:

CI meas= -0.056 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1857,KPDmeas= 0.1897,KC= 0.1797
Ncalc = 1.75 - 1.77

Calculated Properties of Gilmarite

Electron Density:

Bulk Density (Electron Density)=4.04 gm/cc
note: Specific Gravity of Gilmarite =4.29 gm/cc.

Fermion Index:

Fermion Index = 0.0001424449
Boson Index = 0.9998575551

Photoelectric:

PE_Gilmarite= 35.98 barns/electron
U=PE_Gilmarite x rElectron Density= 145.22 barns/cc.

Radioactivity:

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

Gilmarite Classification

Dana Class:

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

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

(41.03.01)Clinoclase Group

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

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

41.03.01.03 Lapeyreite! Cu3O[AsO3(OH)]2•H2O C 2/m 2/m

Strunz Class:

08.BE.25 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BE -With only medium-sized cations, (OH, etc.):RO4 > 2:1

08.BE.25 Arhbarite Cu2Mg(AsO4)(OH)3 P1 1

08.BE.25 Gilmarite! Cu3(AsO4)(OH)3 P1 1

Other Gilmarite Information

See Also:

Links to other databases for Gilmarite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Gilmarite

Cu3(AsO4)(OH)3
Dana No: 41.03.01.02 Strunz No: 08.BE.25
Locality:

Notes: