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Sepiolite Mineral Data + |
General Sepiolite Information |
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| Mg4Si6O15(OH)2·6(H2O) | |||
| Molecular Weight = 613.82 gm | |||
| Magnesium 15.84 % Mg 26.26 % MgO | |||
| Silicon 27.45 % Si 58.73 % SiO2 | |||
| Hydrogen 1.97 % H 17.61 % H2O | |||
| Oxygen 54.74 % O | |||
| ______ ______ | |||
| 100.00 % 102.61 % = TOTAL OXIDE | |||
| Mg4Si6O15·6(H2O) | |||
| Secondary mineral associated with serpentine. Can precipitate from alkali saline waters in arid environments. | |||
| Valid Species (Pre-IMA) 1847 | |||
| Eski Shehr, Asia Minor. Link to MinDat.org Location Data. | |||
| From the Greek, sepia - "cuttlefish" and lithos - "stone." From the German, meerschaum meaning "sea froth." | |||
| ICSD 31142 | |||
| Meerschaum | |||
| PDF 26-1226 | |||
| Sea Foam | |||
Sepiolite Image | |||
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Sepiolite Crystallography |
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| a:b:c =0.4996:1:0.1964 | |||
| a = 13.43, b = 26.88, c = 5.281, Z = 4; V = 1,906.43 Den(Calc)= 2.14 | |||
| Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnan | |||
| By Intensity(I/Io): 12.3(1), 2.58(0.6), 4.4(0.35), | |||
Physical Properties of Sepiolite |
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| [???] Perfect | |||
| Grayish white, Yellowish white, Bluish green white, Reddish white, Gray. | |||
| 2 | |||
| Opaque | |||
| Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). | |||
| Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). | |||
| Fibrous - Crystals made up of fibers. | |||
| 2 - Gypsum | |||
| None. | |||
| Earthy (Dull) | |||
| white | |||
Optical Properties of Sepiolite |
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| CI meas= -0.116 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.043 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2446,KPDmeas= 0.2617,KC= 0.2346 |
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| Biaxial (-), a=1.52, b=1.5202, g=1.53, bire=0.0100, 2V(Calc)=18, 2V(Meas)=20-70. Dispersion none. | |||
Calculated Properties of Sepiolite |
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relectron=2.18 gm/cc |
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| Fermion Index = 0.02892 Boson Index = 0.97108 |
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PESepiolite = 1.43 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Sepiolite is Not Radioactive |
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Sepiolite Classification |
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| 74.3.1b.1 (74)Phyllosilicate Modulated Layers | |||
| (74.3)with joined strips | |||
| (74.3.1b)Palygorskite-sepiolite group (Sepiolite subgroup) | |||
| VIII/H.33-40 VIII - Silicates | |||
| VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others | |||
| VIII/H.33 - Tuperssuatsiaite - Loughlinite series | |||
Other Sepiolite Information |
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| NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) | |||
| Links to other databases for Sepiolite : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Applied Mineralogy 5 -Athena 6 - Crocoite.com Mineral Locations 7 - EUROmin Project 8 - Franklin Minerals(Dunn) 9 -Google Images 10 -Google Scholar 11 -Handbook of Mineralogy (MinSocAm) 12 -Handbook of Mineralogy (UofA) 13 -MinDAT 14 -MinMax(Deutsch) 15 -MinMax(English) 16 -Mineralienatlas (Deutsch) 17 -QUT Mineral Atlas 18 - YupRocks 19 -École des Mines de Paris Search for Sepiolite using: Visit our Advertisers for Sepiolite : Translate Sepiolite Mineral Data : Ask about Sepiolite here : Print or Cut-and-Paste your Sepiolite Specimen Label here :
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