Bermanite Mineral Data

Bermanite Mineral Data +

[Content and History] [Recent Issues] [Back Issues] [Subscriptions] [Contacts]
See Also: [Diamond Crystals] [Excalibur Minerals] [Hudson Institute] [Minerals on CDROM]
Mineral News was founded some twenty years ago and has developed a following of
avid mineral collectors seeking timely information about new finds and other items
of interest to the collector community. Articles are solicited from collector and scientific authors.

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:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
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 large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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)

Search for Bermanite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Bermanite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Bermanite Mineral Data :

Ask about Bermanite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Bermanite

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

Notes: