General Shigaite Information![]() Mn++7Al4(SO4)2(OH)22•8(H2O) |
![]() Molecular Weight = 1,202.90 gm |
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Manganese 31.97 % Mn 41.28 % MnO |
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Aluminum 8.97 % Al 16.95 % Al2O3 |
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Hydrogen 3.18 % H 28.46 % H2O |
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Sulfur 5.33 % S 13.31 % SO3 |
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Oxygen 50.54 % O |
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100.00 % 100.00 % = TOTAL OXIDE |
![]() Mn2+7Al4(SO4)2(OH)22•8(H2O) |
![]() Found in manganosite-rhodocrosite-sonolite ore. |
![]() Approved IMA 1985 |
![]() Loi mine, Shinga Prefecture, Japan. Link to MinDat.org Location Data. |
![]() Named for the locality. |
![]() Shigaite |
![]() ![]() ICSD 82492 |
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PDF 38-428 |
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Shigaite Crystallography![]() a:c = 1:3.47708 |
![]() a = 9.512, c = 33.074, Z = 3; V = 2,591.56 Den(Calc)= 2.31 |
![]() Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3 |
![]() By Intensity(I/Io): 10.98(1), 2.547(0.9), 5.47(0.9), |
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| Physical Properties of Shigaite![]() {0001} Perfect, {0001} Good |
![]() Light yellow, Orange. |
![]() 2.32 |
![]() Transparent to Translucent |
![]() Flexible - Flexible fragments. |
![]() Hexagonal - Six-sided crystal shape in cross-section or habit. |
![]() Tabular - Form dimensions are thin in one direction. |
![]() 2 - Gypsum |
![]() Non-fluorescent. |
![]() yellow white |
| Optical Properties of Shigaite![]() very light yellow. |
![]() light yellow. |
![]() 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 ![]() Uniaxial (-), w=1.546. |
| Calculated Properties of Shigaite![]() Bulk Density (Electron Density)=2.31 gm/cc |
note: Specific Gravity of Shigaite =2.31 gm/cc. ![]() Fermion Index = 0.0006472376 |
Boson Index = 0.9993527624 ![]() PEShigaite = 8.58 barns/electron |
U=PEShigaite x rElectron Density= 19.81 barns/cc. ![]() GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Shigaite is Not Radioactive | Shigaite Classification![]() 31.01.02.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen |
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(31.01)where (A+ B++)m (XO4)p Zq·x(H2O), where m:p>6:1 |
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(31.01.02)Dana Group |
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![]() 07.DD.35 07 - SULFATES (SELENATES, TELLURATES) |
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07.D - Sulfates (selenates, etc.) with additional anions, with H2O |
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07.DD -With only medium-sized cations; sheets of edge-sharing octahedra |
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| Other Shigaite Information![]() NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) |
![]() 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 : A Bijoux Google Search for ShigaiteAdam's Minerals Google Search for Shigaite Cape Minerals Google Search for Shigaite Dakota Matrix Minerals Google Search for Shigaite Excalibur Mineral Corp. Google Search for Shigaite Exceptional Minerals Google Search for Shigaite John Betts Fine Minerals Search for Shigaite McDougall Minerals Google Search for Shigaite Mineral News Website Link Rock and Mineral Shows Google Search for Shigaite Weinrich Minerals, Inc. Google Search for Shigaite Ask about Shigaite here : Print or Cut-and-Paste your Shigaite Specimen Label here :
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