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Shigaite Mineral Data |
General Shigaite Information |
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Mn++7Al4(SO4)2(OH)22•8(H2O) | ||
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Molecular Weight = 1,202.90 gm | ||
Manganese 31.97 % Mn 41.28 % MnO | |||
Aluminum 8.97 % Al 16.95 % Al2O3 | |||
Hydrogen 3.18 % H 28.46 % H2O | |||
Sulfur 5.33 % S 13.31 % SO3 | |||
Oxygen 50.54 % O | |||
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100.00 % 100.00 % = TOTAL OXIDE | |||
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Mn2+7Al4(SO4)2(OH)22•8(H2O) | ||
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Found in manganosite-rhodocrosite-sonolite ore. | ||
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Approved IMA 1985 | ||
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Loi mine, Shinga Prefecture, Japan. Link to MinDat.org Location Data. | ||
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Named for the locality. | ||
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Shigaite ![]() |
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ICSD 82492 | ||
PDF 38-428 | |||
Shigaite Image | |||
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Shigaite Crystallography |
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a:c = 1:3.47708 | ||
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a = 9.512, c = 33.074, Z = 3; V = 2,591.56 Den(Calc)= 2.31 | ||
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Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3 | ||
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By Intensity(I/Io): 10.98(1), 2.547(0.9), 5.47(0.9), | ||
Physical Properties of Shigaite |
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{0001} Perfect, {0001} Good | ||
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Light yellow, Orange. | ||
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2.32 | ||
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Transparent to Translucent | ||
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Flexible - Flexible fragments. | ||
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Hexagonal - Six-sided crystal shape in cross-section or habit. | ||
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Tabular - Form dimensions are thin in one direction. | ||
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2 - Gypsum | ||
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Non-fluorescent. | ||
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yellow white | ||
Optical Properties of Shigaite |
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very light yellow. | ||
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light yellow. | ||
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CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2364,KPDmeas= 0.2353,KC= 0.2367 Ncalc = 1.55 |
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Uniaxial (-), w=1.546. | ||
Calculated Properties of Shigaite |
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Bulk Density (Electron Density)=2.31 gm/cc note: Specific Gravity of Shigaite =2.31 gm/cc. |
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Fermion Index = 0.0006472376 Boson Index = 0.9993527624 |
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PEShigaite = 8.58 barns/electron U=PEShigaite x rElectron Density= 19.81 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Shigaite is Not Radioactive |
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Shigaite Classification |
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31.01.02.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen | ||
(31.01)where (A+ B++)m (XO4)p Zq�x(H2O), where m:p>6:1 | |||
(31.01.02)Dana Group | |||
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07.DD.35 07 - SULFATES (SELENATES, TELLURATES) | ||
07.D - Sulfates (selenates, etc.) with additional anions, with H2O | |||
07.DD -With only medium-sized cations; sheets of edge-sharing octahedra | |||
Other Shigaite Information |
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NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) | ||
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Links to other databases for Shigaite : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 - Am. Min. Crystal Structure Database 4 - Athena 5 - EUROmin Project 6 - Ecole des Mines de Paris 7 - GeoScienceWorld 8 - Google Images 9 - Google Scholar 10 - Handbook of Mineralogy (MinSocAm) 11 - Handbook of Mineralogy (UofA) 12 - MinDAT 13 - Mineralienatlas (Deutsch) 14 - Online Mineral Museum 15 - QUT Mineral Atlas 16 - Ruff.Info 17 - WWW-MINCRYST Search for Shigaite using: Visit our Advertisers for Shigaite : Ask about Shigaite here : Print or Cut-and-Paste your Shigaite Specimen Label here :
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