Mineralogy Database

Rosslerite Mineral Data

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General Rosslerite Information

Help on Chemical  Formula: Chemical Formula: Mg(AsO3OH)•7(H2O)
Help on Composition: Composition: Molecular Weight = 290.34 gm
   Magnesium   8.37 %  Mg   13.88 % MgO
   Arsenic    25.80 %  As   39.58 % As2O5
   Hydrogen    5.21 %  H    46.54 % H2O
   Oxygen     60.62 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg(AsO3OH)•7(H2O)
Help on Environment: Environment: Secondary mineral with other arsenates in oxidized zone of arsenical ore deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1861
Help on Locality: Locality: Bieber, near Hanau, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Karl R�ssler of Hanau, Germany.
Help on Name Pronunciation: Name Pronunciation: Rosslerite + Pronunciation Say ROSSLERITE
Help on Synonym: Synonym: Roesslerite

Rosslerite Image

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Comments: Colorless crystals of rösslerite.
Location: Jáchymov (St Joachimsthal), Krusné Hory (Erzgebirge), Západoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 3.5 mm.
© Thomas Witzke / Abraxas-Verlag

Rosslerite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4481:1:0.2598
Help on Cell Dimensions: Cell Dimensions: a = 11.531, b = 25.73, c = 6.687, Z = 8; beta = 95.12° V = 1,976.07 Den(Calc)= 1.95
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.08(1), 4.72(0.8), 6.49(0.8),

Physical Properties of Rosslerite

Help on Color: Color: Colorless, White.
Help on Density: Density: 1.93
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Vitreous - Dull

Optical Properties of Rosslerite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.108 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.097 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2744,KPDmeas= 0.2772,KC= 0.2501
Ncalc = 1.48 - 1.49
Help on Optical Data: Optical Data: Biaxial (+), a=1.525, b=1.53, g=1.55, bire=0.0250

Calculated Properties of Rosslerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.99 gm/cc
note: Specific Gravity of Rosslerite =1.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0086700162
Boson Index = 0.9913299838
Help on Photoelectric: Photoelectric: PERosslerite = 16.75 barns/electron
U=PERosslerite x rElectron Density= 33.29 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rosslerite is Not Radioactive

Rosslerite Classification

Help on  Dana Class: Dana Class: (39)Hydrated Acid Phosphates, etc
  (39.01)A+ [HXO4] � x(H2O)
  (39.01.09)Dana Group Rosslerite Mg(AsO3OH)•7(H2O) A2/a 2/m Phosphorrosslerite Mg(PO3OH)•7(H2O) A2/a 2/m
Help on  Strunz Class: Strunz Class: 08.CE.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CE -With only medium-sized cations, RO4:H2O � 1:2.5
08.CE.20 Rosslerite Mg(AsO3OH)•7(H2O) A2/a 2/m
08.CE.20 Phosphorrosslerite Mg(PO3OH)•7(H2O) A2/a 2/m

Other Rosslerite Information

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

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Dana No: Strunz No: 08.CE.20





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