Caichengyunite Mineral Data

General Caichengyunite Information

Chemical Formula:

Fe++3Al2(SO4)6•30(H2O)

Composition:

Molecular Weight = 1,345.76 gm

Aluminum 4.39 % Al 8.30 % Al₂O₃

Iron 13.16 % Fe 16.92 % FeO

Hydrogen 4.43 % H 39.62 % H₂O

Sulfur 14.30 % S 35.70 % SO₃

Oxygen 63.72 % O

______ ______

100.00 % 100.54 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_3.17Al_2.19(SO₄)₆•29.6(H₂O)

Environment:

Forms on the underground walls of the mine.

IMA Status:

Not Submitted IMA 2004 (Dana # Added)

Locality:

Pb-Zn mine near the village of Longshu, Hiudong County, Sichuan Province, China. Link to MinDat.org Location Data.

Name Origin:

Named for Cai Chen Yung (1907-1982), Chinese geologist and teacher.

Caichengyunite Crystallography

Axial Ratios:

a:b:c =0.3162:1:0.9382

Cell Dimensions:

a = 7.63, b = 24.13, c = 22.64, Z = 4; beta = 111.06° V = 3,889.87 Den(Calc)= 2.30

Crystal System:

Monoclinic Space Group: Mono

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

By Intensity(I/I_o): 4.886(1)(131), 3.776(0.21)(124), 5.494(0.14)(121),3.252(0.13)(036), 2.727(0.12)(205,117),

Physical Properties of Caichengyunite

Color:

Grayish white.

Density:

2.2

Diaphaneity:

Transparent

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Water Soluble - Water soluble mineral.

Hardness:

1.5-2 - Talc-Gypsum

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Caichengyunite

Gladstone-Dale:

CI meas= 0.12 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.158 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2078,KPDmeas= 0.2172,KC= 0.2469
Ncalc = 1.54 - 1.57

Optical Data:

Biaxial (+), a=1.4756, b=1.4775, g=1.4805, bire=0.0049

Calculated Properties of Caichengyunite

Electron Density:

Bulk Density (Electron Density)=2.27 gm/cc
note: Specific Gravity of Caichengyunite =2.20 gm/cc.

Fermion Index:

Fermion Index = 0.0041736278
Boson Index = 0.9958263722

Photoelectric:

PE_{Caichengyunite}= 4.81 barns/electron
U=PE_{Caichengyunite} x rElectron Density= 10.92 barns/cc.

Radioactivity:

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

Caichengyunite Classification

Dana Class:

29.09.04.01 (29)Hydrated Acid and Sulfates

(29.09)with miscellaneous formulae

(29.09.04)Dana Group

29.09.04.01 Caichengyunite! Fe3Al2(SO4)6•30(H2O) Mono Mono

Strunz Class:

07.CB.95 07 - SULFATES (SELENATES, TELLURATES)

07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O

07.CB -With only medium-sized cations

07.CB.95 Caichengyunite! Fe3Al2(SO4)6•30(H2O) Mono Mono

Other Caichengyunite Information

References:

NAME( AmMin, v 89, p 894) PHYS. PROP.(AmMin, v 89, p 894) OPTIC PROP.(AmMin, v 89, p 894)

See Also:

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

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Caichengyunite

Fe++3Al2(SO4)6•30(H2O)
Dana No: 29.09.04.01 Strunz No: 07.CB.95
Locality:

Notes:

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