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Rossmanite Mineral Data |
General Rossmanite Information |
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[ ]LiAl2Al6(Si6O18)(BO3)3(OH)4 | ||
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Molecular Weight = 923.75 gm | ||
Lithium 0.75 % Li 1.62 % Li2O | |||
Aluminum 23.37 % Al 44.15 % Al2O3 | |||
Silicon 18.24 % Si 39.03 % SiO2 | |||
Boron 3.51 % B 11.30 % B2O3 | |||
Hydrogen 0.44 % H 3.90 % H2O | |||
Oxygen 53.69 % O | |||
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100.00 % 100.00 % = TOTAL OXIDE | |||
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LiAl8Si6O18(BO3)3(OH)4 | ||
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Granitic pegmatite hosted by biotite and hornblende gneiss. | ||
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Approved IMA 1998 (Dana # Added) | ||
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Found in the Hradisko quarry, in the Rozn� lepidolite subtype of granitic pegmatite, northeastern part of the Str�zek Moldanubicum, Czech Republic. Link to MinDat.org Location Data. | ||
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Named after George R. Rossman (1945-), California Institute of Technology, Pasadena, CA, USA, in recognition for his work on the spectroscopy of the tourmaline minerals. | ||
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Rossmanite + Pronunciation ![]() |
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ICSD 85557 | ||
IMA1996-018 | |||
PDF (76-1951) | |||
Rossmanite Image | |||
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Rossmanite Crystallography |
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a:c = 1:0.44927 | ||
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a = 15.77, c = 7.085, Z = 3; V = 1,525.93 Den(Calc)= 3.02 | ||
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Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m | ||
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By Intensity(I/Io): 3.95(1), 2.552(0.93), 1.898(0.72), | ||
Physical Properties of Rossmanite |
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None | ||
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Pink, Pale pink. | ||
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3 | ||
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Transparent | ||
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Brittle - Generally displayed by glasses and most non-metallic minerals. | ||
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Columnar - Forms columns | ||
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Crystalline - Coarse - Occurs as well-formed coarse sized crystals. | ||
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Striated - Parallel lines on crystal surface or cleavage face. | ||
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7 - Quartz | ||
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Vitreous (Glassy) | ||
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white | ||
Optical Properties of Rossmanite |
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CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.023 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2101,KPDmeas= 0.2115,KC= 0.2151 Ncalc = 1.65 |
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Uniaxial (-), e=1.624, w=1.645, bire=0.0210. | ||
Calculated Properties of Rossmanite |
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Bulk Density (Electron Density)=2.97 gm/cc note: Specific Gravity of Rossmanite =3.00 gm/cc. |
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Fermion Index = 0.01 Boson Index = 0.99 |
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PERossmanite = 1.44 barns/electron U=PERossmanite x rElectron Density= 4.28 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Rossmanite is Not Radioactive |
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Rossmanite Classification |
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61.03a.01.03 (61)Cyclosilicate Six-Membered Rings | ||
(61.03a)with borate groups (Alkali-Deficient Tourmaline Subgroup) | |||
(61.03a.01)Foitite Subgroup | |||
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09.CK.05 09 - SILICATES (Germanates) | ||
09.C - Cyclosilicates | |||
09.CK -[Si6O18]12- 6-membered single rings, with insular complex anions | |||
Other Rossmanite Information |
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NAME( AmMin) PHYS. PROP.(Am.Min.,Vol.83,p896-900,1998) OPTIC PROP.(AmMin) | ||
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Links to other databases for Rossmanite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - CalTech Mineral Spectroscopy 4 - GeoScienceWorld 5 - Google Images 6 - Google Scholar 7 - MinDAT 8 - Mineralienatlas (Deutsch) 9 - Online Mineral Museum 10 - QUT Mineral Atlas 11 - Ruff.Info 12 - WWW-MINCRYST Search for Rossmanite using: Visit our Advertisers for Rossmanite : Ask about Rossmanite here : Print or Cut-and-Paste your Rossmanite Specimen Label here :
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