Huangite Mineral Data

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General Huangite Information

Chemical Formula:

Ca0.5Al3(SO4)2(OH)6

Composition:

Molecular Weight = 395.15 gm

Calcium 5.07 % Ca 7.10 % CaO

Aluminum 20.48 % Al 38.70 % Al₂O₃

Hydrogen 1.53 % H 13.68 % H₂O

Sulfur 16.23 % S 40.52 % SO₃

Oxygen 56.68 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca_0.5Al₃(SO₄)₂(OH)₆

Environment:

Product of acid sulfate hydrothermal alteration of rhyolite tuffs and andesites.

IMA Status:

Approved IMA 1992

Locality:

El Indio mine, El Indio-Tambo district, east of La Serena, Coquimbo, Chile. Link to MinDat.org Location Data.

Name Origin:

Named for Yunhui Huang (1926- ), Chinese mineralogist, Institute of Mineral Deposit Geology and Mineral Resources, Beijing, China

Name Pronunciation:

Huangite

Synonym:

IMA1991-009

Huangite Image

Images:

Huangite

Comments: BSE image of alunite (light gray), natroaluminite (dark gray), minamiite (gray slender zone banded by natroaluminite), and huangite (medium gray).
Location: Sulfuric altered andesite, Okumanza, Gunma Prefecture, Japan. Scale: Picture Size 0.31 x 0.24 mm.
© Mineralogical Journal

Huangite Crystallography

Axial Ratios:

a:c = 1:4.79979

Cell Dimensions:

a = 6.983, c = 33.517, Z = 6; V = 1,415.40 Den(Calc)= 2.78

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.97(1), 4.91(0.75), 2.231(0.51),

Physical Properties of Huangite

Cleavage:

{???} Perfect

Color:

White, Yellowish.

Diaphaneity:

Transparent

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Huangite

Optical Data:

NCalc= 1.59 - from Gladstone-Dale relationship (KC = 0.2132) where Ncalc=Dcalc*KC+1

Calculated Properties of Huangite

Electron Density:

Bulk Density (Electron Density)=2.80 gm/cc
note: Specific Gravity of Huangite =2.78 gm/cc.

Fermion Index:

Fermion Index = 0.0015600612
Boson Index = 0.9984399388

Photoelectric:

PE_Huangite= 2.23 barns/electron
U=PE_Huangite x rElectron Density= 6.24 barns/cc.

Radioactivity:

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

Huangite Classification

Dana Class:

30.02.04.08 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.02)where (A B)2 XO4 Zq

(30.02.04)Alunite Group (Alunite Subgroup)

30.02.04.01 Alunite KAl3(SO4)2(OH)6 R 3m, R 3m Trig

30.02.04.02 Natroalunite NaAl3(SO4)2(OH)6 R 3m 3 2/m

30.02.04.03 Schlossmacherite (H3O,Ca)Al3(AsO4,SO4)2(OH)6 R 3m 3 2/m

30.02.04.04 Osarizawaite PbCuAl2(SO4)2(OH)6 R 3m 3m

30.02.04.05 Minamiite (Na,Ca,K)Al3(SO4)2(OH)6 R 3m 3 2/m

30.02.04.06 Ammonioalunite (NH4)Al3(SO4)2(OH)6 R 3m 3 2/m

30.02.04.07 Walthierite Ba0.5Al3(SO4)2(OH)6 R 3m 3 2/m

30.02.04.08 Huangite Ca0.5Al3(SO4)2(OH)6 R 3m 3 2/m

Strunz Class:

07.BC.10 07 - SULFATES (SELENATES, TELLURATES)

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

07.BC -With medium-sized and large cations

07.BC.10 Alunite KAl3(SO4)2(OH)6 R 3m, R 3m Trig

07.BC.10 Ammonioalunite (NH4)Al3(SO4)2(OH)6 R 3m 3 2/m

07.BC.10 Ammoniojarosite (NH4)Fe3(SO4)2(OH)6 R 3m 3m

07.BC.10 Beaverite PbCu(Fe,Al)2(SO4)2(OH)6 R 3m 3m

07.BC.10 Argentojarosite AgFe3(SO4)2(OH)6 R 3m 3m

07.BC.10 Huangite Ca0.5Al3(SO4)2(OH)6 R 3m 3 2/m

07.BC.10 Dorallcharite (Tl,K)Fe3(SO4)2(OH)6 R 3m 3 2/m

07.BC.10 Jarosite KFe3(SO4)2(OH)6 R 3 3

07.BC.10 Hydroniumjarosite (H3O)Fe3(SO4)2(OH)6 R 3m 3m

07.BC.10 Minamiite (Na,Ca,K)Al3(SO4)2(OH)6 R 3m 3 2/m

07.BC.10 Natrojarosite NaFe3(SO4)2(OH)6 R 3m 3m

07.BC.10 Natroalunite NaAl3(SO4)2(OH)6 R 3m 3 2/m

07.BC.10 Osarizawaite PbCuAl2(SO4)2(OH)6 R 3m 3m

07.BC.10 Plumbojarosite PbFe6(SO4)4(OH)12 R 3m 3 2/m

07.BC.10 Schlossmacherite (H3O,Ca)Al3(AsO4,SO4)2(OH)6 R 3m 3 2/m

07.BC.10 Walthierite Ba0.5Al3(SO4)2(OH)6 R 3m 3 2/m

Other Huangite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Am.Min.,Vol.77,p1275-1284,1992)

See Also:

Links to other databases for Huangite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Huangite Specimen Label here :

Huangite

Ca0.5Al3(SO4)2(OH)6
Dana No: 30.02.04.08 Strunz No: 07.BC.10
Locality:

Notes: