Rostite Mineral Data

General Rostite Information

Chemical Formula:

AlSO4(OH,F)•5(H2O)

Composition:

Molecular Weight = 230.53 gm

Aluminum 11.70 % Al 22.11 % Al₂O₃

Hydrogen 4.72 % H 42.20 % H₂O

Sulfur 13.91 % S 34.73 % SO₃

Oxygen 68.02 % O

Fluorine 1.65 % F 1.65 % F

- % F -0.69 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al(SO₄)(OH)_0.8F_0.2•5(H₂O)

Environment:

Burning mine waste heaps with copiapite and ammonia alum. Dimorphous with jurbanite, compare khademite. Redefined 1987.

IMA Status:

Approved IMA 1979

Locality:

Schoeller Coal Mine, Libusin, Kladno district, Bohemia, Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named for Rudolph Rost (1912-), Czech mineralogist.

Name Pronunciation:

Rostite

Synonym:

Lapparentite

Rostite Image

Images:

Rostite Clairite

Comments: Brownish crystals of clairite on white massive rostite.
Location: Anna Mine, Alsdorf, Aachen, North Rhine-Westphalia, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Rostite

Comments: White crystals of rostite on a dark matrix.
Location: Alsdorf, Aachen, North Rhine-Westphalia, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Rostite Crystallography

Axial Ratios:

a:b:c =0.8567:1:0.834

Cell Dimensions:

a = 11.175, b = 13.043, c = 10.878, Z = 8; V = 1,585.53 Den(Calc)= 1.93

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcba

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

By Intensity(I/I_o): 4.26(1), 4.19(0.6), 3.91(0.5),2.03(0.1), 2.5(0.1), 2.73(0.1), 3.27(0.1), 3.35(0.1),

Physical Properties of Rostite

Color:

White.

Density:

1.892

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Streak:

white

Optical Properties of Rostite

Gladstone-Dale:

CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2444,KPDmeas= 0.2493,KC= 0.2515
Ncalc = 1.48 - 1.49

Optical Data:

Biaxial (+), a=1.461, b=1.47, g=1.484, bire=0.0230

Calculated Properties of Rostite

Electron Density:

Bulk Density (Electron Density)=1.97 gm/cc
note: Specific Gravity of Rostite =1.89 gm/cc.

Fermion Index:

Fermion Index = 0.0013767971
Boson Index = 0.9986232029

Photoelectric:

PE_Rostite= 1.30 barns/electron
U=PE_Rostite x rElectron Density= 2.56 barns/cc.

Radioactivity:

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

Rostite Classification

Dana Class:

31.09.11.02 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.09)where (A+ B++) (XO4) Zq·x(H2O)

(31.09.11)Dana Group

31.09.11.01 Khademite Al(SO4)F•5(H2O) Pcab 2/m 2/m 2/m

31.09.11.02 Rostite AlSO4(OH,F)•5(H2O) Pcba 2/m 2/m 2/m

Strunz Class:

07.DB.10 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DB -With only medium-sized cations; insular octahedra and finite groups

07.DB.10 Khademite Al(SO4)F•5(H2O) Pcab 2/m 2/m 2/m

07.DB.10 Rostite AlSO4(OH,F)•5(H2O) Pcba 2/m 2/m 2/m

Other Rostite Information

References:

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

See Also:

Links to other databases for Rostite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

Search for Rostite using:

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

Visit our Advertisers for Rostite :

A Bijoux Google Search for Rostite
Adam's Minerals Google Search for Rostite
Cape Minerals Google Search for Rostite
Dakota Matrix Minerals Google Search for Rostite
Excalibur Mineral Corp. Google Search for Rostite
Exceptional Minerals Google Search for Rostite
John Betts Fine Minerals Search for Rostite
McDougall Minerals Google Search for Rostite
Mineral News Website Link
Rock and Mineral Shows Google Search for Rostite
Weinrich Minerals, Inc. Google Search for Rostite

Ask about Rostite 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 Rostite Specimen Label here :

Rostite

AlSO4(OH,F)•5(H2O)
Dana No: 31.09.11.02 Strunz No: 07.DB.10
Locality:

Notes: