Rostite Mineral Data

Rostite Mineral Data +

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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.

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

Optical Data:

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

Calculated Properties of Rostite

Electron Density:

r_electron=1.97 gm/cc
note: r_Rostite=1.89 gm/cc.

Fermion Index

Fermion Index = 0.00137
Boson Index = 0.99863

Photoelectric:

PE_Rostite= 1.30 barns/electron
U=PE_Rostite x r_electron= 2.56 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rostite is Not Radioactive

Rostite Classification

Dana Class:

31.9.11.2 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.9)where (A+ B++) (XO4) Zq·x(H2O)

(31.9.11)Dana Group

31.9.11.1 Khademite Al(SO4)F·5(H2O) Pcab 2/m 2/m 2/m

31.9.11.2 Rostite AlSO4(OH,F)·5(H2O) Pcba 2/m 2/m 2/m

Strunz Class:

VI/D.06-20* VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size

VI/D.06 - Aluminite series, Jurbanite - Zaherite

VI/D.06-10 Jurbanite Al(SO4)(OH)·5(H2O) P 2₁/n 2/m

VI/D.06-20 Khademite Al(SO4)F·5(H2O) Pcab 2/m 2/m 2/m

VI/D.06-20* Rostite AlSO4(OH,F)·5(H2O) Pcba 2/m 2/m 2/m

VI/D.06-30 Meta-aluminite Al2(SO4)(OH)4·5(H2O) P 2₁/c ? 2/m

VI/D.06-40 Aluminite Al2(SO4)(OH)4·7(H2O) P 2₁/c 2/m

VI/D.06-50 Basaluminite Al4(SO4)(OH)10·5(H2O) P 2₁ 2

VI/D.06-60 Felsobanyaite Al4(SO4)(OH)10·5(H2O) Unk Hex

VI/D.06-70 Hydrobasaluminite Al4(SO4)(OH)10·12-36(H2O) Unk. Mono

VI/D.06-80 Zaherite Al12(SO4)5(OH)26·20H20 P1 or P1 Tri

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Rostite

AlSO4(OH,F)·5(H2O)
Dana No: 31.9.11.2 Strunz No: VI/D.06-20*
Locality:

Notes: