Mineralogy Database

Roselite-beta Mineral Data

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General Roselite-beta Information

Help on Chemical  Formula: Chemical Formula: Ca2(Co,Mg)(AsO4)2•2(H2O)
Help on Composition: Composition: Molecular Weight = 444.30 gm
   Calcium    18.04 %  Ca   25.24 % CaO
   Magnesium   1.37 %  Mg    2.27 % MgO
   Cobalt      9.95 %  Co   12.65 % CoO
   Arsenic    33.73 %  As   51.73 % As2O5
   Hydrogen    0.91 %  H     8.11 % H2O
   Oxygen     36.01 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Co0.75Mg0.25(AsO4)2•2(H2O)
Help on Environment: Environment: Secondary arsenate mineral.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1955
Help on Locality: Locality: Schneeberg, Saxony, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its dimorphic relationship with roselite.
Help on Name Pronunciation: Name Pronunciation: Roselite-beta Say ROSELITE-BETA
Help on Synonym: Synonym: Beta-roselite

Roselite-beta Image

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Comments: Clear, rose-colored roselite-beta crystalline grains.
Location: Bou Azzer, Anti-Atlas Mountains, Morocco. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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Comments: Deep red, well crystallized roselite-beta covering a small pocket in white calcite.
Location: Ahrbar, Bou-Azzer area. Scale: 7 x 4 x 4.5 cm.
© Fabre Minerals

Roselite-beta Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7659:1:0.723
Help on Cell Dimensions: Cell Dimensions: a = 5.89, b = 7.69, c = 5.56, Z = 1; alpha = 112.6°, beta = 70.8°, gamma = 119.4° V = 191.29 Den(Calc)= 3.86
Help on Crystal System: Crystal System: Triclinic Space Group: P 1 or P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.78(1), 1.714(0.8), 3.2(0.8),3.07(0.8), 3.56(0.6), 2.16(0.4), 3.33(0.4), 5.07(0.3),

Physical Properties of Roselite-beta

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Dark rose red.
Help on Density: Density: 3.71
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: pale red

Optical Properties of Roselite-beta

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.039 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1996,KPDmeas= 0.1991,KC= 0.1916
Ncalc = 1.71
Help on Optical Data: Optical Data: Biaxial (-), a=1.723, b=1.737, g=1.756, bire=0.0330

Calculated Properties of Roselite-beta

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.56 gm/cc
note: Specific Gravity of Roselite-beta =3.71 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0017853601
Boson Index = 0.9982146399
Help on Photoelectric: Photoelectric: PERoselite-beta = 28.49 barns/electron
U=PERoselite-beta x rElectron Density= 101.47 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Roselite-beta is Not Radioactive

Roselite-beta Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.02)where A++ (B++)2 (XO4) � x(H2O)
  (40.02.02)Fairfieldite Subgroup (Triclinic: P-1�) Fairfieldite Ca2(Mn,Fe)(PO4)2•2(H2O) P1 1 Messelite Ca2(Fe,Mn)(PO4)2•2(H2O) P1 1 Collinsite Ca2(Mg,Fe)(PO4)2•2(H2O) P1 1 Cassidyite Ca2(Ni,Mg)(PO4)2•2(H2O) P1 1 Talmessite Ca2Mg(AsO4)2•2(H2O) P1 1 Gaitite Ca2Zn(AsO4)2•2(H2O) P1 1 Roselite-beta Ca2(Co,Mg)(AsO4)2•2(H2O) P 1 or P1 Tri Parabrandtite Ca2Mn(AsO4)•2(H2O) P1,P 1 Tri Hillite! Ca2(Zn,Mg)[PO4]2•2(H2O) P1 1 Nickeltalmessite! Ca2Ni(AsO4)2•2H2O P 1
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 Roselite-beta Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Roselite-beta :
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 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 08.CG.10





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