Quenstedtite Mineral Data

Quenstedtite Mineral Data +

General Quenstedtite Information

Chemical Formula:

Fe+++2(SO4)3·10(H2O)

Composition:

Molecular Weight = 580.04 gm

Iron 19.26 % Fe 27.53 % Fe₂O₃

Hydrogen 3.48 % H 31.06 % H₂O

Sulfur 16.58 % S 41.41 % SO₃

Oxygen 60.68 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺₂(SO₄)₃·10(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1889

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after the German mineralogist, F. A. Quenstedt (1809-1889).

Synonym:

ICSD 6223

PDF 17-160

Quenstedtite Image

Images:

Quenstedtite

Comments: White crystalline quenstedtite crust.
Location: Richelsdorf, Hessen, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Quenstedtite Crystallography

Axial Ratios:

a:b:c =0.262:1:0.277

Cell Dimensions:

a = 6.184, b = 23.6, c = 6.539, Z = 2; alpha = 94.18°, beta = 101.73°, gamma = 96.27° V = 926.33 Den(Calc)= 2.08

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 4.109(1), 4.217(0.87), 5.837(0.66),

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Crystal Structure:

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Thomas J N , Robinson P D , Fang J H , American Mineralogist , 59 (1974) p.582-586, Crystal structures and mineral chemistry of hydrated ferric sulfates. IV. The, crystal structure of quenstedtite

Physical Properties of Quenstedtite

Cleavage:

[010] Perfect

Color:

White, Light violet, Red violet.

Density:

2.14

Diaphaniety:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

light violet blue

Optical Properties of Quenstedtite

Gladstone-Dale:

CI meas= -0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2736,KPDmeas= 0.2659,KC= 0.2656

Optical Data:

Biaxial (+), a=1.547, b=1.566, g=1.594, bire=0.0470, 2V(Calc)=82, 2V(Meas)=70.

Calculated Properties of Quenstedtite

Electron Density:

r_electron=2.18 gm/cc
note: r_Quenstedtite=2.14 gm/cc.

Fermion Index

Fermion Index = 0.00562
Boson Index = 0.99438

Photoelectric:

PE_Quenstedtite= 6.59 barns/electron
U=PE_Quenstedtite x r_electron= 14.40 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Quenstedtite is Not Radioactive

Quenstedtite Classification

Dana Class:

29.8.5.1 (29)Hydrated Acid and Sulfates

(29.8)where (A)2 (XO4)3 · x(H2O)

(29.8.5)Dana Group

29.8.5.1 Quenstedtite Fe2(SO4)3·10(H2O) P1 1

Strunz Class:

VI/C.08-60 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium size

VI/C.08 - Rhomboclase - Meta-alunogen series

VI/C.08-10 Rhomboclase (H5O2)Fe(SO4)2·2(H2O) P nma 2/m 2/m 2/m

VI/C.08-20 Lausenite Fe2(SO4)3·6(H2O) Unk. Mono

VI/C.08-30 Kornelite Fe2(SO4)3·7(H2O) P 2₁/c 2/m

VI/C.08-40 Coquimbite Fe2(SO4)3·9(H2O) P 3c 3 2/m

VI/C.08-50 Paracoquimbite Fe2(SO4)3·9(H2O) R 3 3

VI/C.08-60 Quenstedtite Fe2(SO4)3·10(H2O) P1 1

VI/C.08-70 Alunogen Al2(SO4)3·17(H2O) P1 1

VI/C.08-80 Meta-alunogen Al4(SO4)6·27(H2O) Mono

Other Quenstedtite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Quenstedtite :
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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Quenstedtite

Fe+++2(SO4)3·10(H2O)
Dana No: 29.8.5.1 Strunz No: VI/C.08-60
Locality:

Notes: