General Bannisterite Information![]() KCa(Mn,Fe++,Zn,Mg)21(Si,Al)32O76(OH)16•4-12(H2O) |
![]() 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 |
![]() K0.8Na0.2Ca0.9Mn2+12.2Fe2+2.9Mg2.9Zn2.1Fe3+0.6Si28.5Al3O76(OH)16·12.2(H2O) |
![]() Metamorphosed Mn-Zn orebodies. |
![]() Valid Species (Pre-IMA) 1936 |
![]() In the Banallt mine, Rhiw, Lleyn Peninsula, Wales. Link to MinDat.org Location Data. |
![]() Named for Dr. Frederick Allen Bannister (1901-?), formerly Keeper of Minerals, British Museum (Natural History), London, England. |
![]() Bannisterite + Pronunciation |
![]() ![]() ICSD 80078 |
|
PDF 46-1281 |
| | Bannisterite Image
|
![]()
|
Bannisterite Crystallography![]() a:b:c =1.3602:1:1.507 |
![]() a = 22.265, b = 16.368, c = 24.668, Z = 4; beta = 94.285° V = 8,964.72 Den(Calc)= 2.77 |
![]() Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a |
![]() By Intensity(I/Io): 12.33(1), 3.44(0.2), 4.1(0.16), |
|
![]()
Mouse
|
| Physical Properties of Bannisterite![]() {001} Perfect, {???} Distinct |
![]() Dark brown, Black. |
![]() 2.83 - 2.84, Average = 2.83 |
![]() Translucent |
![]() Aggregates - Made of numerous individual crystals or clusters. |
![]() Bladed - Aggregates of thin lath-like crystals (e.g. kyanite). |
![]() Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
![]() 4 - Fluorite |
![]() Resinous |
| Optical Properties of Bannisterite![]() 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 ![]() 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![]() Bulk Density (Electron Density)=2.73 gm/cc |
note: Specific Gravity of Bannisterite =2.77 gm/cc. ![]() Fermion Index = 0.01 |
Boson Index = 0.99 ![]() PEBannisterite = 8.99 barns/electron |
U=PEBannisterite x relectron= 24.57 barns/cc. ![]() |
GRapi = 11.93 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Bannisterite | Bannisterite Classification![]() 74.01.01.04 (74)Phyllosilicate Modulated Layers |
|
(74.01)with joined islands |
|
(74.01.01)Stilpnomelane group |
|
|
|
|
|
![]() 09.EG.75 09 - SILICATES (Germanates) |
|
09.E - Phyllosilicates |
|
09.EG -Double nets with 6-membered and larger rings |
|
| Other Bannisterite Information![]() NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2) |
![]() 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 : A Bijoux Google Search for BannisteriteAdam's Minerals Google Search for Bannisterite Cape Minerals Google Search for Bannisterite Dakota Matrix Minerals Google Search for Bannisterite Excalibur Mineral Corp. Google Search for Bannisterite Exceptional Minerals Google Search for Bannisterite John Betts Fine Minerals Search for Bannisterite McDougall Minerals Google Search for Bannisterite Mineral News Website Link Rock and Mineral Shows Google Search for Bannisterite Weinrich Minerals, Inc. Google Search for Bannisterite Ask about Bannisterite here : Print or Cut-and-Paste your Bannisterite Specimen Label here :
| |
|
| |