Guyanaite Mineral Data + 
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- 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
- 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
General Guyanaite Information |
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 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 | |||
Search for Guyanaite Images | |||
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Images:
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Guyanaite Crystallography |
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| 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 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.224(1), 1.636(0.4), 2.432(0.4), | ||
Physical Properties of Guyanaite |
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| Color: |
Greenish brown, Golden brown, Reddish brown. | ||
| Density: |
4.53 | ||
| Streak: |
brown | ||
Optical Properties of Guyanaite |
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| 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 |
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| Optical Data: |
Biaxial (?), b=1.9 | ||
Calculated Properties of Guyanaite |
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| Electron Density: |
relectron=4.37 gm/cc |
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| Fermion Index |
Fermion Index = 0.05829 Boson Index = 0.94171 |
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| Photoelectric: |
PEGuyanaite = 13.79 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Guyanaite is Not Radioactive |
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Guyanaite Classification |
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| Dana Class: |
6.1.2.3 (6)Hydroxides and Oxides Containing Hydroxyl | ||
| (6.1)where X+++O OH | |||
| (6.1.2)Dana Group | |||
| 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 | |||
Other Guyanaite Information |
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| 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 Search for Guyanaite using: Visit our Advertisers for Guyanaite : Translate Guyanaite Mineral Data : Ask about Guyanaite here : Print or Cut-and-Paste your Guyanaite Specimen Label here :
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