Bianchite Mineral Data

General Bianchite Information

Chemical Formula:

(Zn,Fe++)(SO4)•6(H2O)

Composition:

Molecular Weight = 267.16 gm

Zinc 18.36 % Zn 22.85 % ZnO

Iron 5.23 % Fe 6.72 % FeO

Hydrogen 4.53 % H 40.46 % H₂O

Sulfur 12.00 % S 29.97 % SO₃

Oxygen 59.89 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn_0.75Fe²⁺_0.25(SO₄)•6(H₂O)

Environment:

Post-mine mineral, typically in efflorescences on mine walls, an alteration product of oxidizing sulfides.

IMA Status:

Valid Species (Pre-IMA) 1930

Locality:

Cave del Predil, Raibl mine, south of Tarvisio, Friuli-Venezia Giulia, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Angelo Bianchi (1892-1970), Italian mineralogist, University of Padova, Padova, Italy.

Name Pronunciation:

Bianchite + Pronunciation

Synonym:

ICSD 41708

PDF 16-Dec

Bianchite Image

Images:

Bianchite

Comments: White powdery crust of bianchite on clear to white gypsum.
Location: Glomsrudhollen, Amot, Modum, Buskerud, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bianchite Crystallography

Axial Ratios:

a:b:c =1.402:1:3.4011

Cell Dimensions:

a = 10.096, b = 7.201, c = 24.492, Z = 8; beta = 98.27° V = 1,762.08 Den(Calc)= 2.01

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 4.42(1), 4.03(0.9), 2.965(0.8),

Physical Properties of Bianchite

Color:

Colorless, Yellow, Yellowish white, White, Light blue.

Density:

2.03

Diaphaneity:

Transparent

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Bianchite

Gladstone-Dale:

CI meas= 0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2411,KPDmeas= 0.2388,KC= 0.2393
Ncalc = 1.48 - 1.49

Optical Data:

Biaxial (-), a=1.465, b=1.494, g=1.495, bire=0.0300, 2V(Calc)=20, 2V(Meas)=10.

Calculated Properties of Bianchite

Electron Density:

Bulk Density (Electron Density)=2.08 gm/cc
note: Specific Gravity of Bianchite =2.03 gm/cc.

Fermion Index:

Fermion Index = 0.0098287267
Boson Index = 0.9901712733

Photoelectric:

PE_Bianchite= 10.90 barns/electron
U=PE_Bianchite x rElectron Density= 22.68 barns/cc.

Radioactivity:

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

Bianchite Classification

Dana Class:

29.06.08.02 (29)Hydrated Acid and Sulfates

(29.06)where A XO4 · x(H2O)

(29.06.08)Hexahydrite Group (Space Group: C2/c)

29.06.08.01 Hexahydrite MgSO4•6(H2O) A2/a 2/m

29.06.08.02 Bianchite (Zn,Fe)(SO4)•6(H2O) C 2/c 2/m

29.06.08.03 Ferrohexahydrite FeSO4•6(H2O) C 2/c 2/m

29.06.08.04 Nickelhexahydrite (Ni,Mg,Fe)(SO4)•6(H2O) C 2/c 2/m

29.06.08.05 Moorhouseite (Co,Ni,Mn)SO4•6(H2O) C 2/c 2/m

29.06.08.06 Chvaleticeite (Mn,Mg)SO4•6(H2O) C 2/c 2/m

Strunz Class:

07.CB.25 07 - SULFATES (SELENATES, TELLURATES)

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

07.CB -With only medium-sized cations

07.CB.25 Bianchite (Zn,Fe)(SO4)•6(H2O) C 2/c 2/m

07.CB.25 Ferrohexahydrite FeSO4•6(H2O) C 2/c 2/m

07.CB.25 Chvaleticeite (Mn,Mg)SO4•6(H2O) C 2/c 2/m

07.CB.25 Hexahydrite MgSO4•6(H2O) A2/a 2/m

07.CB.25 Moorhouseite (Co,Ni,Mn)SO4•6(H2O) C 2/c 2/m

07.CB.25 Nickelhexahydrite (Ni,Mg,Fe)(SO4)•6(H2O) C 2/c 2/m

Other Bianchite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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Ask about Bianchite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Print or Cut-and-Paste your Bianchite Specimen Label here :

Bianchite

(Zn,Fe++)(SO4)•6(H2O)
Dana No: 29.06.08.02 Strunz No: 07.CB.25
Locality:

Notes: