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:

Clairite Rostite

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 - Dipyramidal H-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) Zqï¿½x(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

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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:

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