Bermanite Mineral Data

Bermanite Mineral Data +

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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.

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

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

3.5 - Copper Penny

Luster:

Vitreous - Resinous

Optical Properties of Bermanite

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:

r_electron=2.83 gm/cc
note: r_Bermanite=2.87 gm/cc.

Fermion Index

Fermion Index = 0.00023
Boson Index = 0.99977

Photoelectric:

PE_Bermanite= 9.69 barns/electron
U=PE_Bermanite x r_electron= 27.40 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bermanite is Not Radioactive

Bermanite Classification

Dana Class:

42.11.17.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.17)Dana Group

42.11.17.1 Bermanite MnMn2(PO4)2(OH)2·4(H2O) P 2₁ 2

42.11.17.2 Ercitite! Na(Mn,Fe)(PO4)(OH)·2(H2O) P 2₁/n 2/m

Strunz Class:

VII/D.11-40 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.11 - Strunzite series

VII/D.11-10 Ferrostrunzite FeFe2(PO4)2(OH)2·6(H2O) P 1,P1 Tri

VII/D.11-20 Strunzite MnFe2(PO4)2(OH)2·6(H2O) P1 1

VII/D.11-30 Ferristrunzite FeFe2(PO4)2(OH)3·5(H2O) P1,P 1 Tri

VII/D.11-40 Bermanite MnMn2(PO4)2(OH)2·4(H2O) P 2₁ 2

VII/D.11-50 Cacoxenite (Fe,Al)25(PO4)17O6(OH)12·75(H2O) P 6/mmm 6/m 2/m 2/m

VII/D.11-60 Tinticite Fe5(PO4,VO4)4·7(H2O) P1 1

VII/D.11-70 Beraunite FeFe5(PO4)4(OH)5·4(H2O) C 2/c 2/m

VII/D.11-71 Oxiberaunite* (Fe,Mn)Fe5(PO4)4O(OH)4·6(H2O) Mono

VII/D.11-90 Souzalite (Mg,Fe)3(Al,Fe)4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-100 Gormanite Fe3Al4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-110 Dufrenite FeFe4(PO4)3(OH)5·2(H2O) C 2/c 2/m

VII/D.11-120 Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12·4(H2O) C 2/c 2/m

VII/D.11-130 Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6·2(H2O) C 2/c 2/m

VII/D.11-135 Ercitite! Na(Mn,Fe)(PO4)(OH)·2(H2O) P 2₁/n 2/m

VII/D.11-140 Kidwellite Na(Fe,Cu)9x(PO4)6(OH)11·3(H2O) P 2/c 2/m

VII/D.11-150 Meurigite! KFe7(PO4)5(OH)7·8(H2O) C 2,Cm,C 2/m Mono

Other Bermanite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Bermanite

Mn++Mn+++2(PO4)2(OH)2·4(H2O)
Dana No: 42.11.17.1 Strunz No: VII/D.11-40
Locality:

Notes: