Brandtite Mineral Data (original) (raw)
General Brandtite Information
Chemical Formula:
Ca2(Mn,Mg)(AsO4)2•2(H2O)
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
Empirical Formula:
Ca2Mn2+0.75Mg0.25(AsO4)2•2(H2O)
IMA Status:
Valid Species (Pre-IMA) 1888
Locality:
Harstig mine, Pajsberg near Persberg, Varmland, Sweden. Link to MinDat.org Location Data.
Name Origin:
Named for Georg Brandt (1694-1768), Swedish chemist.
Name Pronunciation:
Brandtite + Pronunciation 
Synonym:
ICSD 36235
PDF 29-348
Brandtite Image
Images:
Brandtite Crystallography
Axial Ratios:
a:b:c =0.4548:1:0.4383
Cell Dimensions:
a = 5.899, b = 12.968, c = 5.684, Z = 2; beta = 108.05° V = 413.42 Den(Calc)= 3.54
Crystal System:
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c
X Ray Diffraction:
By Intensity(I/Io): 3.01(1), 3.241(0.7), 3.373(0.55),
Forms:
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| | Forms:( 1 2 0) ( 0 1 0) ( 1 1 0) ( 1 2 2) ( 1 0 0) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
Crystal Structure:
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| | Herwig S , Hawthorne F C , The Canadian Mineralogist , 44 (2006) p.1181-1196, The topology of hydrogen bonding in brandtite, collinsite and fairfieldite, Locality: Harstig mine, Harstigen, Sweden | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
Physical Properties of Brandtite
Cleavage:
{010} Perfect, {001} Good
Color:
Colorless, White.
Density:
3.67
Diaphaneity:
Transparent to Translucent
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Habit:
Striated - Parallel lines on crystal surface or cleavage face.
Hardness:
3.5 - Copper Penny
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Brandtite
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
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
Electron Density:
Bulk Density (Electron Density)=3.52 gm/cc
note: Specific Gravity of Brandtite =3.67 gm/cc.
Fermion Index:
Fermion Index = 0.0017974823
Boson Index = 0.9982025177
Photoelectric:
PEBrandtite = 27.68 barns/electron
U=PEBrandtite x rElectron Density= 97.49 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Brandtite is Not Radioactive
Brandtite Classification
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
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
References:
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
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: