Rosslerite Mineral Data

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 Rï¿½ssler of Hanau, Germany.

Name Pronunciation:

Rosslerite + Pronunciation

Synonym:

Roesslerite

Wapplerite

Rosslerite Image

Images:

Rosslerite

Comments: Colorless crystals of rÃ¶sslerite.
Location: JÃ¡chymov (St Joachimsthal), KrusnÃ© Hory (Erzgebirge), ZÃ¡padoceskÃ½ 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 - Prismatic H-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),

Physical Properties of Rosslerite

Color:

Colorless, White.

Density:

1.93

Diaphaneity:

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
Ncalc = 1.48 - 1.49

Optical Data:

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

Calculated Properties of Rosslerite

Electron Density:

Bulk Density (Electron Density)=1.99 gm/cc
note: Specific Gravity of Rosslerite =1.95 gm/cc.

Fermion Index:

Fermion Index = 0.0086700162
Boson Index = 0.9913299838

Photoelectric:

PE_Rosslerite= 16.75 barns/electron
U=PE_Rosslerite x rElectron Density= 33.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rosslerite is Not Radioactive

Rosslerite Classification

Dana Class:

39.01.09.01 (39)Hydrated Acid Phosphates, etc

(39.01)A+ [HXO4] ï¿½ x(H2O)

(39.01.09)Dana Group

39.01.09.01 Rosslerite Mg(AsO3OH)•7(H2O) A2/a 2/m

39.01.09.02 Phosphorrosslerite Mg(PO3OH)•7(H2O) A2/a 2/m

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 ï¿½ 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

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 - 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
15 - WWW-MINCRYST

Search for Rosslerite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Rosslerite :

Ask about Rosslerite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Rosslerite Specimen Label here :

Rosslerite

Mg(AsO3OH)•7(H2O)
Dana No: 39.01.09.01 Strunz No: 08.CE.20
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.