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Brandtite Mineral Data

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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 Name Pronunciation: Name Pronunciation: Brandtite + Pronunciation Say BRANDTITE
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 - Prismatic H-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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Help on Above

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 Diaphaneity: Diaphaneity: 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
Ncalc = 1.69 - 1.71
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: Bulk Density (Electron Density)=3.52 gm/cc
note: Specific Gravity of Brandtite =3.67 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0017974823
Boson Index = 0.9982025177
Help on Photoelectric: Photoelectric: PEBrandtite = 27.68 barns/electron
U=PEBrandtite x rElectron Density= 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: 40.02.03.02 (40)Hydrated Phosphates, etc
  (40.02)where A++ (B++)2 (XO4) � x(H2O)
  (40.02.03)Roselite Subgroup (Monoclinic: P21/c)
 
40.02.03.01 Roselite Ca2(Co,Mg)(AsO4)2•2(H2O) P 21/c 2/m
 
40.02.03.02 Brandtite Ca2(Mn,Mg)(AsO4)2•2(H2O) P 21/c 2/m
 
40.02.03.03 Zincroselite Ca2Zn(AsO4)2•2(H2O) P 21/c 2/m
 
40.02.03.04 Wendwilsonite Ca2(Mg,Co)(AsO4)2•2(H2O) P 21/c 2/m
 
40.02.03.05 Manganlotharmeyerite! Ca(Mn,Mg,)2(AsO4)2(OH,H2O)2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.CG.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CG -With large and medium-sized cations, RO4:H2O = 1:1
 
08.CG.10 Brandtite Ca2(Mn,Mg)(AsO4)2•2(H2O) P 21/c 2/m
 
08.CG.10 Roselite Ca2(Co,Mg)(AsO4)2•2(H2O) P 21/c 2/m
 
08.CG.10 Roselite-beta Ca2(Co,Mg)(AsO4)2•2(H2O) P 1 or P1 Tri
 
08.CG.10 Zincroselite Ca2Zn(AsO4)2•2(H2O) P 21/c 2/m
 
08.CG.10 Wendwilsonite Ca2(Mg,Co)(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 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Brandtite

Ca2(Mn,Mg)(AsO4)2•2(H2O)
Dana No: 40.02.03.02 Strunz No: 08.CG.10
Locality:

 

Notes:

 

 
   
 


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