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Bannisterite Mineral Data

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General Bannisterite Information

Help on Chemical  Formula: Chemical Formula: KCa(Mn,Fe++,Zn,Mg)21(Si,Al)32O76(OH)16•4-12(H2O)
Help on Composition: Composition: 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
Help on Empirical Formula: Empirical Formula: K0.8Na0.2Ca0.9Mn2+12.2Fe2+2.9Mg2.9Zn2.1Fe3+0.6Si28.5Al3O76(OH)16�12.2(H2O)
Help on Environment: Environment: Metamorphosed Mn-Zn orebodies.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1936
Help on Locality: Locality: In the Banallt mine, Rhiw, Lleyn Peninsula, Wales. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Dr. Frederick Allen Bannister (1901-?), formerly Keeper of Minerals, British Museum (Natural History), London, England.
Help on Name Pronunciation: Name Pronunciation: Bannisterite + Pronunciation Say BANNISTERITE
Help on Synonym: Synonym: ICSD 80078
  PDF 46-1281
 

Bannisterite Image

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  Bannisterite

Comments: Deep red micaceous bannisterite.
Location: Zinc Mine, Broken Hill, New South Wales, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bannisterite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.3602:1:1.507
Help on Cell Dimensions: Cell Dimensions: a = 22.265, b = 16.368, c = 24.668, Z = 4; beta = 94.285° V = 8,964.72 Den(Calc)= 2.77
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12.33(1), 3.44(0.2), 4.1(0.16),
 

Physical Properties of Bannisterite

Help on Cleavage: Cleavage: {001} Perfect, {???} Distinct
Help on Color: Color: Dark brown, Black.
Help on Density: Density: 2.83 - 2.84, Average = 2.83
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Resinous
 

Optical Properties of Bannisterite

Help on Gladstone-Dale: Gladstone-Dale: 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
Help on Optical Data: Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Bannisterite =2.77 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEBannisterite = 8.99 barns/electron
U=PEBannisterite x relectron= 24.57 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 11.93 (Gamma Ray American Petroleum Institute Units)
Concentration of Bannisterite per GRapi unit = 8.39 (%)

Estimated Radioactivity from Bannisterite - barely detectable

 

Bannisterite Classification

Help on  Dana Class: Dana Class: 74.01.01.04 (74)Phyllosilicate Modulated Layers
  (74.01)with joined islands
  (74.01.01)Stilpnomelane group
 
74.01.01.01 Stilpnomelane K(Fe,Mg,Fe)8(Si,Al)12(O,OH)27•n(H2O) P1 1
 
74.01.01.02 Lennilenapeite K6-7(Mg,Mn,Fe,Fe,Zn)48(Si,Al)72(O,OH)216•16(H2O) Unk (pseudo-HEX) Tri
 
74.01.01.03 Franklinphilite (K,Na)4(Mn,Mg,Zn)48(Si,Al)72(O,OH)216•6(H2O) pseudo-HEX P1 or P1 Tri
 
74.01.01.04 Bannisterite KCa(Mn,Fe,Zn,Mg)21(Si,Al)32O76(OH)16•4-12(H2O) A2/a 2/m
 
74.01.01.05 Middendorfite! K3Na2Mn5Si12(O,OH)36•2H2O P 21/m or P 21 Mono
Help on  Strunz Class: Strunz Class: 09.EG.75 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EG -Double nets with 6-membered and larger rings
 
09.EG.75 Bannisterite KCa(Mn,Fe,Zn,Mg)21(Si,Al)32O76(OH)16•4-12(H2O) A2/a 2/m
 

Other Bannisterite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: 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

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Print or Cut-and-Paste your Bannisterite Specimen Label here :

Bannisterite

KCa(Mn,Fe++,Zn,Mg)21(Si,Al)32O76(OH)16•4-12(H2O)
Dana No: 74.01.01.04 Strunz No: 09.EG.75
Locality:

 

Notes:

 

 
   
 


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