Roselite Mineral Data

Roselite Mineral Data +

General Roselite Information

Chemical Formula:

Ca2(Co,Mg)(AsO4)2·2(H2O)

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

Empirical Formula:

Ca₂Co_0.75Mg_0.25(AsO₄)₂·2(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1825

Locality:

Rappold mines, Schneeberg, Saxony, Germany. Rosas mine at Sulcis, Sardinia. Link to MinDat.org Location Data.

Name Origin:

Named after Gustave Rose (1798-1873), professor on mineralogy at the University of Berlin, Germany.

Synonym:

ICSD 200126

PDF 29-315

Roselite Image

Images:

Roselite

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

Roselite Crystallography

Axial Ratios:

a:b:c =0.4466:1:0.4324

Cell Dimensions:

a = 5.801, b = 12.989, c = 5.617, Z = 2; beta = 107.42° V = 403.83 Den(Calc)= 3.65

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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),

Forms:

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Forms: [ 1 2 2] [ 4 1 0] [ 1 2 0] [ 0 1 0] [ 1 2 2] [ 0 0 1]

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Crystal Structure:

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Hawthorne F C , Ferguson R B , The Canadian Mineralogist , 15 (1977) p.36-42, The crystal structure of roselite

Physical Properties of Roselite

Cleavage:

[010] Perfect, [???] Good

Color:

Dark rose red, Pink.

Density:

3.69

Diaphaniety:

Transparent to translucent

Habit:

Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.

Habit:

Mammillary - Larger "breast-like" rounded forms resembling botryoidal (e.g. malachite).

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

light red

Optical Properties of Roselite

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

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.

Pleochroism (x):

dark rose.

Pleochroism (y):

pale rose.

Pleochroism (z):

paler rose.

Calculated Properties of Roselite

Electron Density:

r_electron=3.54 gm/cc
note: r_Roselite=3.69 gm/cc.

Fermion Index

Fermion Index = 0.00178
Boson Index = 0.99822

Photoelectric:

PE_Roselite= 28.49 barns/electron
U=PE_Roselite x r_electron= 100.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Roselite is Not Radioactive

Roselite Classification

Dana Class:

40.2.3.1 (40)Hydrated Phosphates, etc

(40.2)where A++ (B++)2 (XO4) · x(H2O)

(40.2.3)Roselite Subgroup (Monoclinic: P21/c)

40.2.3.1 Roselite Ca2(Co,Mg)(AsO4)2·2(H2O) P 2₁/c 2/m

40.2.3.2 Brandtite Ca2(Mn,Mg)(AsO4)2·2(H2O) P 2₁/c 2/m

40.2.3.3 Zincroselite Ca2Zn(AsO4)2·2(H2O) P 2₁/c 2/m

40.2.3.4 Wendwilsonite Ca2(Mg,Co)(AsO4)2·2(H2O) P 2₁/c 2/m

40.2.3.5 Manganlotharmeyerite! Ca(Mn,Mg,)2(AsO4)2(OH,H2O)2 C 2/m 2/m

Strunz Class:

VII/C.17-100 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.17 - Collinsite - Wendwilsonite series

VII/C.17-10 Collinsite Ca2(Mg,Fe)(PO4)2·2(H2O) P1 1

VII/C.17-15 Hillite! Ca2(Zn,Mg)[PO4]2·2(H2O) P1 1

VII/C.17-20 Messelite Ca2(Fe,Mn)(PO4)2·2(H2O) P1 1

VII/C.17-30 Fairfieldite Ca2(Mn,Fe)(PO4)2·2(H2O) P1 1

VII/C.17-40 Cassidyite Ca2(Ni,Mg)(PO4)2·2(H2O) P1 1

VII/C.17-50 Talmessite Ca2Mg(AsO4)2·2(H2O) P1 1

VII/C.17-60 Gaitite Ca2Zn(AsO4)2·2(H2O) P1 1

VII/C.17-70 Parabrandtite Ca2Mn(AsO4)·2(H2O) P1,P 1 Tri

VII/C.17-80 Roselite-beta Ca2(Co,Mg)(AsO4)2·2(H2O) P 1 or P1 Tri

VII/C.17-90 Wendwilsonite Ca2(Mg,Co)(AsO4)2·2(H2O) P 2₁/c 2/m

VII/C.17-100 Roselite Ca2(Co,Mg)(AsO4)2·2(H2O) P 2₁/c 2/m

VII/C.17-110 Brandtite Ca2(Mn,Mg)(AsO4)2·2(H2O) P 2₁/c 2/m

VII/C.17-120 Zincroselite Ca2Zn(AsO4)2·2(H2O) P 2₁/c 2/m

Other Roselite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Roselite

Ca2(Co,Mg)(AsO4)2·2(H2O)
Dana No: 40.2.3.1 Strunz No: VII/C.17-100
Locality:

Notes: