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Bannisterite Mineral Data |
General Bannisterite Information |
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KCa(Mn,Fe++,Zn,Mg)21(Si,Al)32O76(OH)16•4-12(H2O) | ||
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Molecular Weight = 3,734.70 gm | ||
Potassium 0.84 % K 1.01 % K2O | |||
Sodium 0.12 % Na 0.17 % Na2O | |||
Calcium 0.97 % Ca 1.35 % CaO | |||
Magnesium 1.89 % Mg 3.13 % MgO | |||
Manganese 17.95 % Mn 23.17 % MnO | |||
Aluminum 2.17 % Al 4.10 % Al2O3 | |||
Zinc 3.68 % Zn 4.58 % ZnO | |||
Iron 5.23 % Fe 5.58 % FeO / 1.28 % Fe2O3 | |||
Silicon 21.43 % Si 45.85 % SiO2 | |||
Hydrogen 1.09 % H 9.74 % H2O | |||
Oxygen 44.64 % O | |||
______ ______ | |||
100.00 % 99.96 % = TOTAL OXIDE | |||
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K0.8Na0.2Ca0.9Mn2+12.2Fe2+2.9Mg2.9Zn2.1Fe3+0.6Si28.5Al3O76(OH)16�12.2(H2O) | ||
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Metamorphosed Mn-Zn orebodies. | ||
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Valid Species (Pre-IMA) 1936 | ||
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In the Banallt mine, Rhiw, Lleyn Peninsula, Wales. Link to MinDat.org Location Data. | ||
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Named for Dr. Frederick Allen Bannister (1901-?), formerly Keeper of Minerals, British Museum (Natural History), London, England. | ||
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Bannisterite + Pronunciation ![]() |
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ICSD 80078 | ||
PDF 46-1281 | |||
Bannisterite Image | |||
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Bannisterite Crystallography |
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a:b:c =1.3602:1:1.507 | ||
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a = 22.265, b = 16.368, c = 24.668, Z = 4; beta = 94.285° V = 8,964.72 Den(Calc)= 2.77 | ||
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Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/a | ||
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By Intensity(I/Io): 12.33(1), 3.44(0.2), 4.1(0.16), | ||
Physical Properties of Bannisterite |
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{001} Perfect, {???} Distinct | ||
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Dark brown, Black. | ||
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2.83 - 2.84, Average = 2.83 | ||
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Translucent | ||
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Aggregates - Made of numerous individual crystals or clusters. | ||
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Bladed - Aggregates of thin lath-like crystals (e.g. kyanite). | ||
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Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | ||
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4 - Fluorite | ||
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Resinous | ||
Optical Properties of Bannisterite |
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CI meas= 0.042 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2116,KPDmeas= 0.2067,KC= 0.2158 Ncalc = 1.6 - 1.61 |
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Biaxial (?), a=1.544-1.574, b=1.586-1.611, g=1.589-1.612, bire=0.0380-0.0450, 2V(Calc)=18-28, 2V(Meas)=small. Dispersion r < v moderate. | ||
Calculated Properties of Bannisterite |
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Bulk Density (Electron Density)=2.73 gm/cc note: Specific Gravity of Bannisterite =2.77 gm/cc. |
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Fermion Index = 0.01 Boson Index = 0.99 |
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PEBannisterite = 8.99 barns/electron U=PEBannisterite x relectron= 24.57 barns/cc. |
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GRapi = 11.93 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Bannisterite |
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Bannisterite Classification |
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74.01.01.04 (74)Phyllosilicate Modulated Layers | ||
(74.01)with joined islands | |||
(74.01.01)Stilpnomelane group | |||
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09.EG.75 09 - SILICATES (Germanates) | ||
09.E - Phyllosilicates | |||
09.EG -Double nets with 6-membered and larger rings | |||
Other Bannisterite Information |
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NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2) | ||
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Links to other databases for Bannisterite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 5 - Franklin Minerals(Dunn) 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 16 - WWW-MINCRYST Search for Bannisterite using: Visit our Advertisers for Bannisterite : Ask about Bannisterite here : Print or Cut-and-Paste your Bannisterite Specimen Label here :
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