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Fe2+3Al2(SO4)6 · 30H2O
grayish white
Vitreous, Silky
1½ - 2
Specific Gravity:
Crystal System:
Named for Chinese geology professor Cai Chen Yung (1907-1982)
Grayish-white filiform, fibrous aggregates.

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Classification of CaichengyuniteHide

Unnamed (probably valid)
Approval History:
Unnamed, but probably valid.

Physical Properties of CaichengyuniteHide

Vitreous, Silky
grayish white
1½ - 2 on Mohs scale
2.20 g/cm3 (Measured)    2.19 g/cm3 (Calculated)

Optical Data of CaichengyuniteHide

Biaxial (+)
RI values:
nα = 1.476 nβ = 1.478 nγ = 1.481
Max Birefringence:
δ = 0.005
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Optical Extinction:
inclined extinction 5-10o parallel to the fibers

Chemical Properties of CaichengyuniteHide

Fe2+3Al2(SO4)6 · 30H2O

Crystallography of CaichengyuniteHide

Crystal System:
Cell Parameters:
a = 7.63 Å, b = 24.13 Å, c = 22.64 Å
β = 111.06°
a:b:c = 0.316 : 1 : 0.938
Unit Cell V:
3,889.87 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
5.494 (14)
4.886 (100)
3.776 (21)
3.252 (13)
2.727 (12)

First Recorded Occurrence of CaichengyuniteHide

Fluorescence of CaichengyuniteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for CaichengyuniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ru-bo Zhang, et al. Caichengyunite: a hydrous sulphate mineral. J. Central Soutn Univ Technolo 3394),331-334(2002) [Am. Min.89,894(2004)](abstract)

Internet Links for CaichengyuniteHide

Localities for CaichengyuniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
China (FRL)
  • Sichuan Province
    • Liangshan Autonomous Prefecture
      • Huidong Co.
Am.Min. 89,894(2004)
Mineral and/or Locality  
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