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Cookeite Mineral Data |
General Cookeite Information |
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LiAl4(Si3Al)O10(OH)8 | ||
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Molecular Weight = 522.16 gm | ||
Lithium 1.33 % Li 2.86 % Li2O | |||
Aluminum 25.84 % Al 48.82 % Al2O3 | |||
Silicon 16.14 % Si 34.52 % SiO2 | |||
Hydrogen 1.54 % H 13.80 % H2O | |||
Oxygen 55.15 % O | |||
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100.00 % 100.00 % = TOTAL OXIDE | |||
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LiAl5Si3O10(OH)8 | ||
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Alteration of lithia tourmalines and lepidolite in pegmatites. | ||
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Valid Species (Pre-IMA) 1866 | ||
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Oxford Co., Maine, USA. Pala, San Diego Co., California, USA. Link to MinDat.org Location Data. | ||
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Named for Josiah B. Cooke, Jr. (1827-1894), American mineralogist and chemist, Harvard University, Cambridge, Massachusetts, USA. | ||
Cookeite Image | |||
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Cookeite Crystallography |
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a:b:c =0.5744:1:3.2138 | ||
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a = 5.13, b = 8.93, c = 28.7, Z = 4; beta = 98.75° V = 1,299.47 Den(Calc)= 2.67 | ||
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Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a | ||
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By Intensity(I/Io): 2.315(1), 3.52(0.9), 4.7(0.9), | ||
Physical Properties of Cookeite |
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{001} Perfect | ||
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White, Green, Brown, Yellowish white, Pinkish white. | ||
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2.67 | ||
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Transparent to translucent | ||
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Flexible - Flexible fragments. | ||
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Micaceous - Platy texture with "flexible" plates. | ||
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Pseudo Hexagonal - Crystals show a hexagonal outline. | ||
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2.5 - Finger Nail | ||
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Non-fluorescent. | ||
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Vitreous (Glassy) | ||
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white | ||
Optical Properties of Cookeite |
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CI meas= 0.044 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.044 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2185,KPDmeas= 0.2185,KC= 0.2286 Ncalc = 1.61 |
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Biaxial (+), a=1.572-1.576, b=1.579-1.584, g=1.589-1.6, bire=0.0170-0.0240 | ||
Calculated Properties of Cookeite |
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Bulk Density (Electron Density)=2.68 gm/cc note: Specific Gravity of Cookeite =2.67 gm/cc. |
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Fermion Index = 0.0087996327 Boson Index = 0.9912003673 |
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PECookeite = 1.42 barns/electron U=PECookeite x rElectron Density= 3.79 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Cookeite is Not Radioactive |
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Cookeite Classification |
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71.04.01.02 (71)Phyllosilicate Sheets of Six-Membered Rings | ||
(71.04)interlayered 1:1, 2:1, and octahedra | |||
(71.04.01)Chlorite group (Tri-Dioctahedral) | |||
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09.EC.55 09 - SILICATES (Germanates) | ||
09.E - Phyllosilicates | |||
09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets | |||
Other Cookeite Information |
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NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
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Links to other databases for Cookeite : 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 - Mineral and Gemstone Kingdom 12 - Mineralienatlas (Deutsch) 13 - Online Mineral Museum 14 - QUT Mineral Atlas 15 - Ruff.Info 16 - Scandinavian mineral gallery 17 - WWW-MINCRYST Search for Cookeite using: Visit our Advertisers for Cookeite : Ask about Cookeite here : Print or Cut-and-Paste your Cookeite Specimen Label here :
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