Bermanite Mineral Data

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

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

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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)

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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:

PE_Bermanite= 9.69 barns/electron
U=PE_Bermanite 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: