General Sturmanite Information![]() Ca6(Fe+++,Al,Mn++)2(SO4)2[B(OH)4](OH)12•25(H2O) |
![]() Molecular Weight = 1,265.59 gm |
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Calcium 19.00 % Ca 26.59 % CaO |
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Manganese 1.30 % Mn 1.68 % MnO |
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Aluminum 1.28 % Al 2.42 % Al2O3 |
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Iron 5.30 % Fe 7.57 % Fe2O3 |
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Boron 0.85 % B 2.75 % B2O3 |
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Hydrogen 5.26 % H 46.97 % H2O |
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Sulfur 5.07 % S 12.65 % SO3 |
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Oxygen 61.95 % O |
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100.00 % 100.63 % = TOTAL OXIDE |
![]() Ca6Fe3+1.2Al0.6Mn2+0.3(SO4)2B(OH)16·25(H2O) |
![]() Approved IMA 1983 |
![]() Black Rock mine, Kuruman district, Cape Province, South Africa. Link to MinDat.org Location Data. |
![]() Named for B. Darko Sturman (1937-), Canadian mineralogist, Royal Ontario Museum, Toronto, Canada. |
![]() Sturmanite + Pronunciation |
![]() ![]() IMA1981-011 |
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Sturmanite Crystallography![]() a:c = 1:1.9525 |
![]() a = 11.16, c = 21.79, Z = 2; V = 2,350.26 Den(Calc)= 1.79 |
![]() Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: P 31c |
![]() By Intensity(I/Io): 9.67(1), 3.89(0.7), 5.58(0.7), |
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| Physical Properties of Sturmanite![]() {1010} Perfect |
![]() Greenish yellow, Yellow, Yellow green, Orange brown. |
![]() 1.847 |
![]() Transparent to Translucent |
![]() Hexagonal - Six-sided crystal shape in cross-section or habit. |
![]() Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
![]() Pyramidal - Crystals are shaped like pyramids. |
![]() 2.5 - Finger Nail |
![]() Non-fluorescent. |
![]() Vitreous (Glassy) |
![]() yellow white |
| Optical Properties of Sturmanite![]() pale green. |
![]() pale yellowish green. |
![]() CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC) |
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2807,KPDmeas= 0.2721,KC= 0.276 Ncalc = 1.49 - 1.51 ![]() Uniaxial (+), w=1.5, e=1.505, bire=0.0050. |
| Calculated Properties of Sturmanite![]() Bulk Density (Electron Density)=1.93 gm/cc |
note: Specific Gravity of Sturmanite =1.85 gm/cc. ![]() Fermion Index = 0.0037641249 |
Boson Index = 0.9962358751 ![]() PESturmanite = 4.51 barns/electron |
U=PESturmanite x rElectron Density= 8.72 barns/cc. ![]() GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Sturmanite is Not Radioactive | Sturmanite Classification![]() 32.04.04.02 (32)Compound Sulfates |
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(32.04)(hydrous) with poly-anionic formula |
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(32.04.04)Charlesite Group |
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![]() 07.DG.15 07 - SULFATES (SELENATES, TELLURATES) |
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07.D - Sulfates (selenates, etc.) with additional anions, with H2O |
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07.DG -With large and medium sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3 |
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| Other Sturmanite Information![]() NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) |
![]() Links to other databases for Sturmanite : |
1 - Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Athena 4 - EUROmin Project 5 - Ecole des Mines de Paris 6 - GeoScienceWorld 7 - Google Images 8 - Google Scholar 9 - Handbook of Mineralogy (MinSocAm) 10 - Handbook of Mineralogy (UofA) 11 - MinDAT 12 - Mineralienatlas (Deutsch) 13 - Online Mineral Museum 14 - QUT Mineral Atlas 15 - Ruff.Info Search for Sturmanite using: Visit our Advertisers for Sturmanite : A Bijoux Google Search for SturmaniteAdam's Minerals Google Search for Sturmanite Cape Minerals Google Search for Sturmanite Dakota Matrix Minerals Google Search for Sturmanite Excalibur Mineral Corp. Google Search for Sturmanite Exceptional Minerals Google Search for Sturmanite John Betts Fine Minerals Search for Sturmanite McDougall Minerals Google Search for Sturmanite Mineral News Website Link Rock and Mineral Shows Google Search for Sturmanite Weinrich Minerals, Inc. Google Search for Sturmanite Ask about Sturmanite here : Print or Cut-and-Paste your Sturmanite Specimen Label here :
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