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Caichengyunite

Valid as an unnamed mineral

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Formula:

Fe²⁺₃Al₂(SO₄)₆ · 30H₂O

Colour:

Grayish white

Lustre:

Vitreous, Silky

Hardness:

1½ - 2

Specific Gravity:

2.20

Crystal System:

Monoclinic

Name:

Named for Chinese geology professor Cai Chen Yung (1907-1982).

First Recorded Locality:

ⓘ Longshu Pb-Zn deposit, Huidong County, Liangshan Yi, Sichuan, China

Grayish-white filiform, fibrous aggregates.

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Unique IdentifiersHide

Mindat ID:

39649

Long-form identifier:

mindat:1:1:39649:9

GUID
(UUID V4):

4f2959b6-7697-4702-b284-96bbcd158cf8

IMA Classification of CaichengyuniteHide

IMA status notes:

Unnamed (probably valid)

First published:

2002

Approval history:

Unnamed, but probably valid.

Classification of CaichengyuniteHide

Strunz-mindat (2024):

7.CB.57

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H₂O
B : With only medium-sized cations

Physical Properties of CaichengyuniteHide

Lustre:

Vitreous, Silky

Transparency:

Transparent

Colour:

Grayish white

Streak:

White

Hardness:

1½ - 2 on Mohs scale

Density:

2.20 g/cm³ (Measured) 2.19 g/cm³ (Calculated)

Optical Data of CaichengyuniteHide

Type:

Biaxial (+)

RI values:

n_α = 1.476 n_β = 1.478 n_γ = 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:

Moderate

Optical Extinction:

Inclined extinction 5-10° parallel to the fibers.

Chemistry of CaichengyuniteHide

Mindat Formula:

Fe²⁺₃Al₂(SO₄)₆ · 30H₂O

Elements listed:

Al, Fe, H, O, S - search for minerals with similar chemistry

Crystallography of CaichengyuniteHide

Crystal System:

Monoclinic

Cell Parameters:

a = 7.63 Å, b = 24.13 Å, c = 22.64 Å
β = 111.06°

Ratio:

a:b:c = 0.316 : 1 : 0.938

Unit Cell V:

3,889.87 Å³ (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
5.494 Å	(14)
4.886 Å	(100)
3.776 Å	(21)
3.252 Å	(13)
2.727 Å	(12)

First Recorded Occurrence of CaichengyuniteHide

First Recorded Locality:

ⓘ Longshu Pb-Zn deposit, Huidong County, Liangshan Yi, Sichuan, China

General Appearance of First Recorded Material:

Grayish white, filiform, fibrous aggregates with grains up to 30 mm long and 0.01 mm in diameter.

Place of Conservation of First Recorded Material:

not given

Geological Setting of First Recorded Material:

Underground walls of an oxidized Pb-Zn ore deposit.

Associated Minerals at First Recorded Locality:

Related Minerals - Strunz-mindat Grouping Hide

7.CB.	Sarvodaite	Al₂(SO₄)₃ · 5H₂O	Mon. 2/m : P2₁/m
7.CB.02	Voudourisite	CdSO₄ · H₂O	Mon. 2/m : P2₁/m
7.CB.05	Dwornikite	Ni(SO₄) · H₂O	Mon. 2/m : B2/b
7.CB.05	Gunningite	ZnSO₄ · H₂O	Mon. 2/m : B2/b
7.CB.05	Kieserite	MgSO₄ · H₂O	Mon. 2/m : B2/b
7.CB.05	Poitevinite	(Cu,Fe)SO₄ · H₂O	Tric. 1 : P1
7.CB.05	Szmikite	MnSO₄ · H₂O	Mon. 2/m : B2/b
7.CB.05	Szomolnokite	FeSO₄ · H₂O	Mon. 2/m : B2/b
7.CB.05	Cobaltkieserite	CoSO₄ · H₂O	Mon. 2/m : B2/b
7.CB.07	Sanderite	MgSO₄ · 2H₂O	Orth. 2 2 2 : P2₁ 2₁ 2₁
7.CB.10	Bonattite	CuSO₄ · 3H₂O	Mon. m : Bb
7.CB.12	Belogubite	CuZn(SO₄)₂ · 10H₂O	Tric. 1 : P1
7.CB.15	Aplowite	(Co,Mn,Ni)SO₄ · 4H₂O	Mon. 2/m
7.CB.15	Boyleite	(Zn,Mg)SO₄ · 4H₂O	Mon. 2/m : P2₁/b
7.CB.15	Ilesite	(Mn,Zn,Fe)SO₄ · 4H₂O	Mon. 2/m
7.CB.15	Rozenite	FeSO₄ · 4H₂O	Mon. 2/m : P2₁/b
7.CB.15	Starkeyite	MgSO₄ · 4H₂O	Mon. 2/m : P2₁/b
7.CB.15	Drobecite	CdSO₄ · 4H₂O	Mon. 2/m : P2₁/m
7.CB.15	Cranswickite	MgSO₄ · 4H₂O	Mon. m : Bb
7.CB.20	Chalcanthite	CuSO₄ · 5H₂O	Tric. 1 : P1
7.CB.20	Jôkokuite	MnSO₄ · 5H₂O	Tric. 1 : P1
7.CB.20	Pentahydrite	MgSO₄ · 5H₂O	Tric. 1 : P1
7.CB.20	Siderotil	FeSO₄ · 5H₂O	Tric.
7.CB.25	Bianchite	Zn(SO₄) · 6H₂O	Mon. 2/m : P2/m
7.CB.25	Chvaleticeite	Mn(SO₄) · 6H₂O	Mon. 2/m : B2/b
7.CB.25	Ferrohexahydrite	FeSO₄ · 6H₂O	Mon. 2/m : B2/b
7.CB.25	Hexahydrite	MgSO₄ · 6H₂O	Mon. 2/m : P2/m
7.CB.25	Moorhouseite	Co(SO₄) · 6H₂O	Mon. 2/m : B2/b
7.CB.25	Nickelhexahydrite	Ni(SO₄) · 6H₂O	Mon. 2/m : B2/b
7.CB.30	Retgersite	NiSO₄ · 6H₂O	Tet. 4 2 2 : P4₁ 2₁ 2
7.CB.35	Bieberite	CoSO₄ · 7H₂O	Mon. 2/m : P2/m
7.CB.35	Boothite	CuSO₄ · 7H₂O	Mon. 2/m : P2₁/b
7.CB.35	Mallardite	MnSO₄ · 7H₂O	Mon. 2/m : P2/m
7.CB.35	Melanterite	Fe²⁺(H₂O)₆SO₄ · H₂O	Mon. 2/m : P2₁/b
7.CB.35	Zincmelanterite	(Zn,Cu,Fe)SO₄ · 7H₂O	Mon. 2/m : P2₁/b
7.CB.35	Alpersite	(Mg,Cu)(SO₄) · 7H₂O	Mon. 2/m : P2₁/b
7.CB.40	Epsomite	MgSO₄ · 7H₂O	Orth. 2 2 2 : P2₁ 2₁ 2₁
7.CB.40	Goslarite	ZnSO₄ · 7H₂O	Orth. 2 2 2 : P2₁ 2₁ 2₁
7.CB.40	Morenosite	NiSO₄ · 7H₂O	Orth. 2 2 2 : P2₁ 2₁ 2₁
7.CB.45	Alunogen	Al₂(SO₄)₃ · 17H₂O	Tric. 1 : P1
7.CB.45	Meta-alunogen	Al₂(SO₄)₃ · 12H₂O	Orth.
7.CB.50	Aluminocoquimbite	Al₂Fe₂(SO₄)₆(H₂O)₁₂ · 6H₂O	Trig. 3m (3 2/m) : P3 1c
7.CB.50	Lazaridisite	3CdSO₄ · 8H₂O	Mon. 2/m : B2/b
7.CB.52	Pararaisaite	CuMg[Te⁶⁺O₄(OH)₂] · 6H₂O	Mon. 2/m : P2₁/b
7.CB.55	Coquimbite	AlFe₃(SO₄)₆(H₂O)₁₂ · 6H₂O	Trig. 3m (3 2/m) : P3 1c
7.CB.55	Paracoquimbite	Fe₄(SO₄)₆(H₂O)₁₂ · 6H₂O	Trig. 3 : R3
7.CB.55	Rhomboclase	(H₅O₂)Fe³⁺(SO₄)₂ · 2H₂O	Orth. mmm (2/m 2/m 2/m) : Pnma
7.CB.55	Raisaite	CuMg[Te⁶⁺O₄(OH)₂] · 6H₂O	Mon. 2/m : B2/b
7.CB.60	Kornelite	Fe₂(SO₄)₃ · 7H₂O	Mon. 2/m : P2₁/m
7.CB.65	Quenstedtite	Fe₂(SO₄)₃ · 11H₂O	Tric. 1 : P1
7.CB.70	Lausenite	Fe₂(SO₄)₃ · 5H₂O	Mon. 2/m : P2₁/m
7.CB.75	Lishizhenite	ZnFe₂(SO₄)₄ · 14H₂O	Tric. 1 : P1
7.CB.75	Römerite	Fe²⁺Fe³⁺₂(SO₄)₄ · 14H₂O	Tric. 1 : P1
7.CB.80	Ransomite	CuFe₂(SO₄)₄ · 6H₂O	Mon. 2/m : P2₁/b
7.CB.85	Apjohnite	Mn²⁺Al₂(SO₄)₄ · 22H₂O	Mon. 2/m : P2₁/b
7.CB.85	Bílinite	Fe²⁺Fe³⁺₂(SO₄)₄ · 22H₂O	Mon. 2/m : P2₁/b
7.CB.85	Dietrichite	(Zn,Fe²⁺,Mn²⁺)Al₂(SO₄)₄ · 22H₂O	Mon. 2/m : P2₁/b
7.CB.85	Halotrichite	FeAl₂(SO₄)₄ · 22H₂O	Mon. 2 : P2
7.CB.85	Pickeringite	MgAl₂(SO₄)₄ · 22H₂O	Mon. 2/m : P2₁/b
7.CB.85	Redingtonite	(Fe²⁺,Mg,Ni)(Cr,Al)₂(SO₄)₄ · 22H₂O	Mon. 2
7.CB.85	Wupatkiite	(Co,Mg,Ni)Al₂(SO₄)₄ · 22H₂O	Mon. 2/m : P2₁/b
7.CB.90	Meridianiite	MgSO₄ · 11H₂O	Tric. 1 : P1

Fluorescence of CaichengyuniteHide

In UV light:

Not fluorescent.

Other InformationHide

Notes:

Rapidly soluble in water.

Health Risks:

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

Internet Links for CaichengyuniteHide

mindat.org URL:

https://www.mindat.org/min-39649.html
Please feel free to link to this page.

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References for CaichengyuniteHide

Reference List:

Ru-bo Zhang, Yu-yu Zhang, Zhou Hong, Zi-hua Mao, Fa-lu Liu, Ji Xi (2002) Caichengyunite (Fe32+Al2(SO4)6·30H2O): A hydrous sulphate mineral. Journal Central South University of Technology, 33(4), 331–334. (in Chinese, English abs.)

Jambor, J.L., Roberts, A.C. (2004) New Mineral Names. American Mineralogist, 89, 894–897.

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

China (FRL)