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Griffithite Mineral Data |
General Griffithite Information |
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4(Mg,Fe,Ca)O.(Al,Fe)2O3.5SiO2•7(H2O) | |
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Molecular Weight = 764.30 gm | |
Calcium 2.10 % Ca 2.93 % CaO | ||
Magnesium 7.63 % Mg 12.66 % MgO | ||
Aluminum 5.30 % Al 10.01 % Al2O3 | ||
Iron 12.42 % Fe 11.28 % FeO / 5.22 % Fe2O3 | ||
Silicon 18.37 % Si 39.31 % SiO2 | ||
Hydrogen 1.85 % H 16.50 % H2O | ||
Oxygen 52.33 % O | ||
______ ______ | ||
100.00 % 97.91 % = TOTAL OXIDE | ||
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Mg2.4Fe2+1.2Ca0.4Al1.5Fe3+0.5Si5O18�7(H2O) | |
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Amygdaloidal cavities in basalt. A variety of ferroan saponite. | |
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Not Approved IMA | |
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Cahuenga Pass, Griffith Park, Los Angeles, California, USA. Link to MinDat.org Location Data. | |
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Named after its locality. | |
Griffithite Crystallography |
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Monoclinic | |
Physical Properties of Griffithite |
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{001} Perfect | |
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Dark green. | |
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2.31 | |
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Subtransparent to subtranslucent | |
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Platy - Sheet forms (e.g. micas). | |
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1 - Talc | |
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Non-fluorescent. | |
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Vitreous - Dull | |
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Magnetic after heating | |
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green | |
Optical Properties of Griffithite |
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CI meas= -0.028 (Excellent) - where the CI = (1-KPDmeas/KC) KPDmeas= 0.2341,KC= 0.2277 Ncalc = 1.53 |
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Biaxial (-), a=1.485, b=1.565, g=1.572, bire=0.0870 | |
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pale yellow. | |
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olive green. | |
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brownish green. | |
Calculated Properties of Griffithite |
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Bulk Density (Electron Density)=2.32 gm/cc note: Specific Gravity of Griffithite =2.31 gm/cc. |
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Fermion Index = 0.01 Boson Index = 0.99 |
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PEGriffithite = 4.93 barns/electron U=PEGriffithite x rElectron Density= 11.46 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Griffithite is Not Radioactive |
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Griffithite Classification |
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71.00.00.00 (71)Phyllosilicate Minerals | |
(71.00)Without Dana Classification Numbers | ||
(71.00.00)Chlorite Group | ||
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09.EC.45 09 - SILICATES (Germanates) | |
09.E - Phyllosilicates | ||
09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets | ||
Other Griffithite Information |
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NAME( Ford32) PHYS. PROP.(Dana) OPTIC PROP.(Ford32) | |
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Links to other databases for Griffithite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - GeoScienceWorld 4 - Google Images 5 - Google Scholar 6 - MinDAT 7 - Mineralienatlas (Deutsch) 8 - Online Mineral Museum 9 - QUT Mineral Atlas 10 - Ruff.Info Search for Griffithite using: Visit our Advertisers for Griffithite : Ask about Griffithite here : Print or Cut-and-Paste your Griffithite Specimen Label here :
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