Mineralogy Database

Bermanite Mineral Data

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General Bermanite Information

Help on Chemical  Formula: Chemical Formula: Mn++Mn+++2(PO4)2(OH)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 460.83 gm
   Manganese   35.76 %  Mn   15.39 % MnO / 34.26 % Mn2O3
   Phosphorus  13.44 %  P    30.80 % P2O5
   Hydrogen     2.19 %  H    19.55 % H2O
   Oxygen      48.61 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+Mn3+2(PO4)2(OH)2•4(H2O)
Help on Environment: Environment: A late-stage hydrothermal mineral replacing primary phosphate phases, usually triplite or lithiophilite, in complex granite pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1936
Help on Locality: Locality: In the USA, from the 7U7 Ranch, 40 km west of Hillside, Bagdad district, Yavapai Co., Arizona. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: In honor of Dr. Harry Berman (1902-1944), Professor of Mineralogy, Harvard University, Cambridge, Massachusetts, USA.
Help on Name Pronunciation: Name Pronunciation: Bermanite + Pronunciation Say BERMANITE
Help on Synonym: Synonym: ICSD 12125
  PDF 20-712

Bermanite Image

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Comments: Brown bermanite crystal.
Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Bermanite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.2829:1:0.2819
Help on Cell Dimensions: Cell Dimensions: a = 5.446, b = 19.25, c = 5.428, Z = 2; beta = 110.29° V = 533.74 Den(Calc)= 2.87
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.68(1), 4.81(0.65), 5.08(0.65),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 1) ( 0 1 0) ( 1 1 1) ( 1 1 0) ( 0 0 1)

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Bermanite

Help on Cleavage: Cleavage: {001} Perfect, {110} Indistinct
Help on Color: Color: Light red, Dark reddish brown.
Help on Density: Density: 2.84
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous - Resinous

Optical Properties of Bermanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2509,KPDmeas= 0.2535,KC= 0.2563
Ncalc = 1.73 - 1.74
Help on Optical Data: Optical Data: Biaxial (-), a=1.687, b=1.725, g=1.748, bire=0.0610, 2V(Calc)=74, 2V(Meas)=74.

Calculated Properties of Bermanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.80 gm/cc
note: Specific Gravity of Bermanite =2.84 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002365889
Boson Index = 0.9997634111
Help on Photoelectric: Photoelectric: PEBermanite = 9.69 barns/electron
U=PEBermanite x rElectron Density= 27.11 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bermanite is Not Radioactive

Bermanite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.17)Bermanite Group Bermanite MnMn2(PO4)2(OH)2•4(H2O) P 21 2 Ercitite! Na2(H2O)4[Mn2(OH)2(PO4)2] C mca 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.DC.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
08.DC.20 Bermanite MnMn2(PO4)2(OH)2•4(H2O) P 21 2

Other Bermanite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Bermanite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.DC.20





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