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Grimaldiite Mineral Data |
General Grimaldiite Information |
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Cr+++O(OH) | ||
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Molecular Weight = 85.00 gm | ||
Chromium 61.17 % Cr 89.40 % Cr2O3 | |||
Hydrogen 1.19 % H 10.60 % H2O | |||
Oxygen 37.64 % O | |||
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100.00 % 100.00 % = TOTAL OXIDE | |||
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CrO(OH) | ||
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Fine-grained intergrowth with other chromium oxide-hydroxide minerals in alluvial gravels. Trimorphous with bracewellite and guyanaite. | ||
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Approved IMA 1967 | ||
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Basin of the Merume River, Guyana. Link to MinDat.org Location Data. | ||
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Named for Frank Saverio Grimaldi (1915- ), formerly Chief Chemist, U.S. Geological Survey. | ||
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Grimaldiite + Pronunciation ![]() |
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Grimaldiite Image | |||
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Grimaldiite Crystallography |
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a:c = 1:4.50454 | ||
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a = 2.973, c = 13.392, Z = 3; V = 102.51 Den(Calc)= 4.13 | ||
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Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m | ||
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By Intensity(I/Io): 4.44(1), 2.407(0.3), 1.858(0.25), | ||
Physical Properties of Grimaldiite |
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Dark red, Reddish brown. | ||
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4.11 | ||
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Opaque | ||
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3.5-4.5 - Between Copper Penny and Fluorite-Apatite | ||
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Metallic | ||
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red | ||
Optical Properties of Grimaldiite |
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NCalc= 2.22 - from Gladstone-Dale relationship (KC = 0.2953) where Ncalc=Dcalc*KC+1 NCalc= 2.21 - from Gladstone-Dale relationship (KC = 0.2953) where Ncalc=Dmeas*KC+1 |
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Calculated Properties of Grimaldiite |
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Bulk Density (Electron Density)=3.98 gm/cc note: Specific Gravity of Grimaldiite =4.13 gm/cc. |
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Fermion Index = 0.05 Boson Index = 0.95 |
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PEGrimaldiite = 13.79 barns/electron U=PEGrimaldiite x rElectron Density= 54.95 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Grimaldiite is Not Radioactive |
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Grimaldiite Classification |
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06.01.05.01 (06)Hydroxides and Oxides Containing Hydroxyl | ||
(06.01)where X+++O OH | |||
(06.01.05)Dana Group | |||
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04.FE.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate | ||
04.F - Hydroxides (without V or U) | |||
04.FE -Hydroxides with OH, without H2O; sheets of edge-sharing octahedra | |||
Other Grimaldiite Information |
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NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) | ||
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Links to other databases for Grimaldiite : 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 Search for Grimaldiite using: Visit our Advertisers for Grimaldiite : Ask about Grimaldiite here : Print or Cut-and-Paste your Grimaldiite Specimen Label here :
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