Rosslerite Mineral Data

Rosslerite Mineral Data +

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General Rosslerite Information

Chemical Formula:

Mg(AsO3OH)·7(H2O)

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

Empirical Formula:

Mg(AsO₃OH)·7(H₂O)

Environment:

Secondary mineral with other arsenates in oxidized zone of arsenical ore deposits.

IMA Status:

Valid Species (Pre-IMA) 1861

Locality:

Bieber, near Hanau, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Karl Rössler of Hanau, Germany.

Synonym:

Roesslerite

Wapplerite

Rosslerite Image

Images:

Rosslerite

Comments: Colorless crystals of r?sslerite.
Location: J?chymov (St Joachimsthal), Krusn? Hory (Erzgebirge), Z?padocesk? Kraj, Bohemia, Czech Republic. Scale: Picture size 3.5 mm.
© Thomas Witzke / Abraxas-Verlag

Rosslerite Crystallography

Axial Ratios:

a:b:c =0.4481:1:0.2598

Cell Dimensions:

a = 11.531, b = 25.73, c = 6.687, Z = 8; beta = 95.12° V = 1,976.07 Den(Calc)= 1.95

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a

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

By Intensity(I/I_o): 4.08(1), 4.72(0.8), 6.49(0.8),

Crystal Structure:

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Ferraris G , Franchini-Angela M , Acta Crystallographica, Section B , 29 (1973) p.286-292, Hydrogen bonding in the crystalline state. Crystal structure of MgHAsO4*7H2O, roesslerite, Note: B(1,3) of O2 was altered to reproduce axial lengths, Locality: synthetic

Physical Properties of Rosslerite

Color:

Colorless, White.

Density:

1.93

Diaphaniety:

Transparent

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous - Dull

Optical Properties of Rosslerite

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

Optical Data:

Biaxial (+), a=1.525, b=1.53, g=1.55, bire=0.0250

Calculated Properties of Rosslerite

Electron Density:

r_electron=1.99 gm/cc
note: r_Rosslerite=1.95 gm/cc.

Fermion Index

Fermion Index = 0.00867
Boson Index = 0.99133

Photoelectric:

PE_Rosslerite= 16.75 barns/electron
U=PE_Rosslerite x r_electron= 33.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rosslerite is Not Radioactive

Rosslerite Classification

Dana Class:

39.1.9.1 (39)Hydrated Acid Phosphates, etc

(39.1)A+ [HXO4] · x(H2O)

(39.1.9)Dana Group

39.1.9.1 Rosslerite Mg(AsO3OH)·7(H2O) A2/a 2/m

39.1.9.2 Phosphorrosslerite Mg(PO3OH)·7(H2O) A2/a 2/m

Strunz Class:

VII/C.15-30 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.15 - Brassite - Rösslerite series

VII/C.15-10 Brassite Mg(AsO3OH)·4(H2O) P bca 2/m 2/m 2/m

VII/C.15-20 Phosphorrosslerite Mg(PO3OH)·7(H2O) A2/a 2/m

VII/C.15-30 Rosslerite Mg(AsO3OH)·7(H2O) A2/a 2/m

Other Rosslerite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Rosslerite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Rosslerite

Mg(AsO3OH)·7(H2O)
Dana No: 39.1.9.1 Strunz No: VII/C.15-30
Locality:

Notes: