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Roselite Mineral Data

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General Roselite 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 IMA Status: IMA Status: Valid Species (Pre-IMA) 1825
Help on Locality: Locality: Rappold mines, Schneeberg, Saxony, Germany. Rosas mine at Sulcis, Sardinia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Gustave Rose (1798-1873), professor on mineralogy at the University of Berlin, Germany.
Help on Name Pronunciation: Name Pronunciation: Roselite Say ROSELITE
Help on Synonym: Synonym: ICSD 200126
  PDF 29-315

Roselite Image

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Comments: Gemmy crystals of roselite.
Location: Bou Azzer, Anti-Atlas Mts., Morocco. Scale: Crystal size 3 mm.
© John Veevaert

Roselite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4466:1:0.4324
Help on Cell Dimensions: Cell Dimensions: a = 5.801, b = 12.989, c = 5.617, Z = 2; beta = 107.42° V = 403.83 Den(Calc)= 3.65
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): 2.99(1), 3.22(0.8), 3.35(0.6),2.76(0.5), 3.4(0.3), 5.09(0.2), 6.44(0.2), 3.75(0.1),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 2 2) ( 4 1 0) ( 1 2 0) ( 0 1 0) ( 1 2 2) ( 0 0 1)

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Physical Properties of Roselite

Help on Cleavage: Cleavage: {010} Perfect, {???} Good
Help on Color: Color: Dark rose red, Pink.
Help on Density: Density: 3.69
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.
Help on Habit: Habit: Mammillary - Larger "breast-like" rounded forms resembling botryoidal (e.g. malachite).
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light red

Optical Properties of Roselite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1998,KPDmeas= 0.1977,KC= 0.1916
Ncalc = 1.7 - 1.71
Help on Optical Data: Optical Data: Biaxial (-), a=1.725, b=1.728, g=1.735, bire=0.0100, 2V(Calc)=68, 2V(Meas)=small. Dispersion r > v weak.
Help on Pleochroism (x): Pleochroism (x): dark rose.
Help on Pleochroism (y): Pleochroism (y): pale rose.
Help on Pleochroism (z): Pleochroism (z): paler rose.

Calculated Properties of Roselite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.54 gm/cc
note: Specific Gravity of Roselite =3.69 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0017853601
Boson Index = 0.9982146399
Help on Photoelectric: Photoelectric: PERoselite = 28.49 barns/electron
U=PERoselite x rElectron Density= 100.93 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Roselite is Not Radioactive

Roselite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.02)where A++ (B++)2 (XO4) � x(H2O)
  (40.02.03)Roselite Subgroup (Monoclinic: P21/c) Roselite Ca2(Co,Mg)(AsO4)2•2(H2O) P 21/c 2/m Brandtite Ca2(Mn,Mg)(AsO4)2•2(H2O) P 21/c 2/m Zincroselite Ca2Zn(AsO4)2•2(H2O) P 21/c 2/m Wendwilsonite Ca2(Mg,Co)(AsO4)2•2(H2O) P 21/c 2/m 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 Roselite 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 :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
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

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Dana No: Strunz No: 08.CG.10





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