Bermanite Mineral Data (original) (raw)
General Bermanite Information
Chemical Formula:
Mn++Mn+++2(PO4)2(OH)2•4(H2O)
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
Empirical Formula:
Mn2+Mn3+2(PO4)2(OH)2•4(H2O)
Environment:
A late-stage hydrothermal mineral replacing primary phosphate phases, usually triplite or lithiophilite, in complex granite pegmatites.
IMA Status:
Valid Species (Pre-IMA) 1936
Locality:
In the USA, from the 7U7 Ranch, 40 km west of Hillside, Bagdad district, Yavapai Co., Arizona. Link to MinDat.org Location Data.
Name Origin:
In honor of Dr. Harry Berman (1902-1944), Professor of Mineralogy, Harvard University, Cambridge, Massachusetts, USA.
Name Pronunciation:
Bermanite + Pronunciation 
Synonym:
ICSD 12125
PDF 20-712
Vierlingite
Bermanite Image
Images:
Bermanite Crystallography
Axial Ratios:
a:b:c =0.2829:1:0.2819
Cell Dimensions:
a = 5.446, b = 19.25, c = 5.428, Z = 2; beta = 110.29° V = 533.74 Den(Calc)= 2.87
Crystal System:
Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 21
X Ray Diffraction:
By Intensity(I/Io): 9.68(1), 4.81(0.65), 5.08(0.65),
Forms:
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| | Forms:( 1 1 1) ( 0 1 0) ( 1 1 1) ( 1 1 0) ( 0 0 1) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
Crystal Structure:
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| | Kampf A R , Moore P B , American Mineralogist , 61 (1976) p.1241-1248, The crystal structure of bermanite, a hydrated manganese phosphate | | -------------------------------------------------------------------------------------------------------------------------------------------- |
Physical Properties of Bermanite
Cleavage:
{001} Perfect, {110} Indistinct
Color:
Light red, Dark reddish brown.
Density:
2.84
Diaphaneity:
Transparent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Hardness:
3.5 - Copper Penny
Luster:
Vitreous - Resinous
Optical Properties of Bermanite
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
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
Electron Density:
Bulk Density (Electron Density)=2.80 gm/cc
note: Specific Gravity of Bermanite =2.84 gm/cc.
Fermion Index:
Fermion Index = 0.0002365889
Boson Index = 0.9997634111
Photoelectric:
PEBermanite = 9.69 barns/electron
U=PEBermanite x rElectron Density= 27.11 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bermanite is Not Radioactive
Bermanite Classification
Dana Class:
42.11.17.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
(42.11)where (AB)4 (XO4)3 Zq � x(H2O)
(42.11.17)Bermanite Group
42.11.17.01 Bermanite MnMn2(PO4)2(OH)2•4(H2O) P 21 2
42.11.17.02 Ercitite! Na2(H2O)4[Mn2(OH)2(PO4)2] C mca 2/m 2/m 2/m
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
References:
NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
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
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Bermanite Specimen Label here :
Bermanite
Mn++Mn+++2(PO4)2(OH)2•4(H2O)
Dana No: 42.11.17.01 Strunz No: 08.DC.20
Locality:
Notes: