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Guyanaite Mineral Data

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General Guyanaite Information

Help on Chemical  Formula: Chemical Formula: CrO(OH)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: CrO(OH)
Help on Environment: Environment: Fine-grained intergrowth with other chromium oxide-hydroxide minerals. Trimorphous with bracewellite and grimaldiite.
Help on IMA Status: IMA Status: Approved IMA 1967
Help on Locality: Locality: Merume River and its tributaries, Mazaruni district, Guyana. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the localtiy.
Help on Name Pronunciation: Name Pronunciation: Guyanaite + Pronunciation Say GUYANAITE
Help on Synonym: Synonym: ICSD 2257
  PDF 25-1437

Guyanaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.1308:1:0.6887
Help on Cell Dimensions: Cell Dimensions: a = 4.857, b = 4.295, c = 2.958, Z = 2; V = 61.71 Den(Calc)= 4.57
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.224(1), 1.636(0.4), 2.432(0.4),

Physical Properties of Guyanaite

Help on Color: Color: Greenish brown, Golden brown, Reddish brown.
Help on Density: Density: 4.53
Help on Streak: Streak: brown

Optical Properties of Guyanaite

Help on Gladstone-Dale: 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
Ncalc = 2.34 - 2.35
Help on Optical Data: Optical Data: Biaxial (?), b=1.9

Calculated Properties of Guyanaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.37 gm/cc
note: Specific Gravity of Guyanaite =4.53 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEGuyanaite = 13.79 barns/electron
U=PEGuyanaite x rElectron Density= 60.27 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Guyanaite is Not Radioactive

Guyanaite Classification

Help on  Dana Class: Dana Class: (06)Hydroxides and Oxides Containing Hydroxyl
  (06.01)where X+++O OH
  (06.01.02)Boehmite Group Boehmite AlO(OH) Amam 2/m 2/m 2/m Lepidocrocite FeO(OH) Amam 2/m 2/m 2/m Guyanaite CrO(OH) Pnnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.FD.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FD -Hydroxides with OH, without H2O; chains of edge-sharing octahedra
04.FD.10 Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m
04.FD.10 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m
04.FD.10 Guyanaite CrO(OH) Pnnm 2/m 2/m 2/m
04.FD.10 Groutite MnO(OH) Pbnm 2/m 2/m 2/m
04.FD.10 Goethite FeO(OH) Pbnm 2/m 2/m 2/m
04.FD.10 Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m
04.FD.10 Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m

Other Guyanaite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Guyanaite :
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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Dana No: Strunz No: 04.FD.10





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