Brandtite Mineral Data + Say BRANDTITE


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General Brandtite Information

Help on Chemical  Formula: Chemical Formula: Ca2(Mn,Mg)(AsO4)2·2(H2O)
Help on Composition: Composition: Molecular Weight = 441.30 gm
   Calcium    18.16 %  Ca   25.41 % CaO
   Magnesium   1.38 %  Mg    2.28 % MgO
   Manganese   9.34 %  Mn   12.06 % MnO
   Arsenic    33.95 %  As   52.08 % As2O5
   Hydrogen    0.91 %  H     8.16 % H2O
   Oxygen     36.25 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Mn2+0.75Mg0.25(AsO4)2·2(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1888
Help on Locality: Locality: Harstig mine, Pajsberg near Persberg, Varmland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Georg Brandt (1694-1768), Swedish chemist.
Help on Synonym: Synonym: ICSD 36235
  PDF 29-348
 

Brandtite Image

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Brandtite

Comments: Clear, crystalline brandtite aggregates.
Location: Harstig mine, Pajsberg, Varmland, Sweden. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Brandtite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4548:1:0.4383
Help on Cell Dimensions: Cell Dimensions: a = 5.899, b = 12.968, c = 5.684, Z = 2; beta = 108.05° V = 413.42 Den(Calc)= 3.54
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.01(1), 3.241(0.7), 3.373(0.55),
Help on Forms: Forms:

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Forms: [ 1 2 0] [ 0 1 0] [ 1 1 0] [ 1 2 2] [ 1 0 0]

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Physical Properties of Brandtite

Help on Cleavage: Cleavage: [010] Perfect, [001] Good
Help on Color: Color: Colorless, White.
Help on Density: Density: 3.67
Help on Diaphaniety: Diaphaniety: Transparent to Translucent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Brandtite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.202,KPDmeas= 0.1949,KC= 0.1938
Help on Optical Data: Optical Data: Biaxial (+), a=1.707-1.709, b=1.711, g=1.724-1.729, bire=0.0170-0.0200, 2V(Calc)=38-60, 2V(Meas)=23. Dispersion r < v strong.
 

Calculated Properties of Brandtite

Help on Electron Density: Electron Density:

relectron=3.52 gm/cc
note: rBrandtite =3.67 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00179
Boson Index = 0.99821
Help on Photoelectric: Photoelectric:

PEBrandtite = 27.68 barns/electron
U=PEBrandtite x relectron= 97.49 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Brandtite is Not Radioactive

 

Brandtite Classification

Help on  Dana Class: Dana Class: 40.2.3.2 (40)Hydrated Phosphates, etc
  (40.2)where A++ (B++)2 (XO4) · x(H2O)
  (40.2.3)Roselite Subgroup (Monoclinic: P21/c)
 
40.2.3.1 Roselite Ca2(Co,Mg)(AsO4)2·2(H2O) P 21/c 2/m
 
40.2.3.2 Brandtite Ca2(Mn,Mg)(AsO4)2·2(H2O) P 21/c 2/m
 
40.2.3.3 Zincroselite Ca2Zn(AsO4)2·2(H2O) P 21/c 2/m
 
40.2.3.4 Wendwilsonite Ca2(Mg,Co)(AsO4)2·2(H2O) P 21/c 2/m
 
40.2.3.5 Manganlotharmeyerite! Ca(Mn,Mg,)2(AsO4)2(OH,H2O)2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: VII/C.17-110 VII - Phosphates, Arsenates and Vanadates
  VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+
  VII/C.17 - Collinsite - Wendwilsonite series
 
VII/C.17-10 Collinsite Ca2(Mg,Fe)(PO4)2·2(H2O) P1 1
 
VII/C.17-15 Hillite! Ca2(Zn,Mg)[PO4]2·2(H2O) P1 1
 
VII/C.17-20 Messelite Ca2(Fe,Mn)(PO4)2·2(H2O) P1 1
 
VII/C.17-30 Fairfieldite Ca2(Mn,Fe)(PO4)2·2(H2O) P1 1
 
VII/C.17-40 Cassidyite Ca2(Ni,Mg)(PO4)2·2(H2O) P1 1
 
VII/C.17-50 Talmessite Ca2Mg(AsO4)2·2(H2O) P1 1
 
VII/C.17-60 Gaitite Ca2Zn(AsO4)2·2(H2O) P1 1
 
VII/C.17-70 Parabrandtite Ca2Mn(AsO4)·2(H2O) P1,P 1 Tri
 
VII/C.17-80 Roselite-beta Ca2(Co,Mg)(AsO4)2·2(H2O) P 1 or P1 Tri
 
VII/C.17-90 Wendwilsonite Ca2(Mg,Co)(AsO4)2·2(H2O) P 21/c 2/m
 
VII/C.17-100 Roselite Ca2(Co,Mg)(AsO4)2·2(H2O) P 21/c 2/m
 
VII/C.17-110 Brandtite Ca2(Mn,Mg)(AsO4)2·2(H2O) P 21/c 2/m
 
VII/C.17-120 Zincroselite Ca2Zn(AsO4)2·2(H2O) P 21/c 2/m
 

Other Brandtite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Brandtite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 - Franklin Minerals(Dunn) 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Brandtite

Ca2(Mn,Mg)(AsO4)2·2(H2O)
Dana No: 40.2.3.2 Strunz No: VII/C.17-110
Locality:

 

Notes:

 

 
   
 
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