Guyanaite Mineral Data

Guyanaite Mineral Data +

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General Guyanaite Information

Chemical Formula:

CrO(OH)

Composition:

Molecular Weight = 85.00 gm

Chromium 61.17 % Cr 89.40 % Cr₂O₃

Hydrogen 1.19 % H 10.60 % H₂O

Oxygen 37.64 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CrO(OH)

IMA Status:

Approved IMA 1967

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 2257

PDF 25-1437

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Guyanaite Crystallography

Axial Ratios:

a:b:c =1.1308:1:0.6887

Cell Dimensions:

a = 4.857, b = 4.295, c = 2.958, Z = 2; V = 61.71 Den(Calc)= 4.57

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnnm

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

By Intensity(I/I_o): 3.224(1), 1.636(0.4), 2.432(0.4),

Physical Properties of Guyanaite

Color:

Greenish brown, Golden brown, Reddish brown.

Density:

4.53

Streak:

brown

Optical Properties of Guyanaite

Gladstone-Dale:

CI meas= 0.327 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.333 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1969,KPDmeas= 0.1987,KC= 0.2953

Optical Data:

Biaxial (?), b=1.9

Calculated Properties of Guyanaite

Electron Density:

r_electron=4.37 gm/cc
note: r_Guyanaite=4.53 gm/cc.

Fermion Index

Fermion Index = 0.05829
Boson Index = 0.94171

Photoelectric:

PE_Guyanaite= 13.79 barns/electron
U=PE_Guyanaite x r_electron= 60.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Guyanaite is Not Radioactive

Guyanaite Classification

Dana Class:

6.1.2.3 (6)Hydroxides and Oxides Containing Hydroxyl

(6.1)where X+++O OH

(6.1.2)Dana Group

6.1.2.1 Boehmite AlO(OH) Amam 2/m 2/m 2/m

6.1.2.2 Lepidocrocite FeO(OH) Amam 2/m 2/m 2/m

6.1.2.3 Guyanaite CrO(OH) Pnnm 2/m 2/m 2/m

Strunz Class:

IV/F.07-60 IV - Oxides

IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure

IV/F.07 - Lithiophorite - Grimaldiite series

IV/F.07-10 Lithiophorite (Al,Li)MnO2(OH)2 R 3m 3 2/m

IV/F.07-20 Asbolane (Co,Ni)1-y(MnO2)2-x(OH)2-2y2x·n(H2O) Unk Hex

IV/F.07-30 Heterogenite-2H CoO(OH) P 6₃/mmc 6/m 2/m 2/m

IV/F.07-40 Heterogenite-3R CoO(OH) R 3m 3 2/m

IV/F.07-50 Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m

IV/F.07-60 Guyanaite CrO(OH) Pnnm 2/m 2/m 2/m

IV/F.07-70 Grimaldiite CrO(OH) R 3m 3 2/m

Other Guyanaite 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 Guyanaite :
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 Guyanaite Specimen Label here :

Guyanaite

CrO(OH)
Dana No: 6.1.2.3 Strunz No: IV/F.07-60
Locality:

Notes: