Langite Mineral Data

General Langite Information

Chemical Formula:

Cu4(SO4)(OH)6•2(H2O)

Composition:

Molecular Weight = 488.32 gm

Copper 52.05 % Cu 65.16 % CuO

Hydrogen 2.06 % H 18.45 % H₂O

Sulfur 6.57 % S 16.40 % SO₃

Oxygen 39.32 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₄(SO₄)(OH)₆•2(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1864

Locality:

Fowey Consols, Tywardreath, Par Area, St Austell District, Cornwall, England, UK Link to MinDat.org Location Data.

Name Origin:

Named after the Viennese physicist, V. von Lang (1838-1921).

Name Pronunciation:

Langite

Synonym:

ICSD 201837

PDF 43-671

Langite Image

Images:

Langite

Comments: Bluish, tabular blades of twinned langite crystals on matrix.
Location: Mollau, France. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Langite

Comments: Encrustation of small (less than one mm.) sky blue langite crystals, on matrix.
Location: Lubietova, Slovakia. Scale: Picture size 1.5 cm.
© Sandro Maggia/Minernet.it

Langite Crystallography

Axial Ratios:

a:b:c =1.1796:1:1.8576

Cell Dimensions:

a = 7.118, b = 6.034, c = 11.209, Z = 2; beta = 90.02° V = 481.43 Den(Calc)= 3.37

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Pc

Forms:

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Forms: ( 0 1 0) ( 1 1 0) ( 0 2 1) ( 0 0 1)

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Crystal Structure:

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Galy J , Jaud J , Pulou R , Sempere R , Bulletin de Mineralogie , 107 (1984) p.641-648, Structure cristalline de la langite, Cu4[SO4(OH)6H2O]*H2O, Locality: Mazega, Aveyrone, France

Physical Properties of Langite

Cleavage:

{001} Perfect, {010} Distinct

Color:

Blue green, Green blue, Sky blue.

Density:

3.5

Diaphaneity:

Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Concretionary - Rounded massive fine-grained materials.

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Vitreous (Glassy)

Streak:

greenish blue

Optical Properties of Langite

Gladstone-Dale:

CI meas= -0.066 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.107 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2241,KPDmeas= 0.2158,KC= 0.2025
Ncalc = 1.68 - 1.71

Optical Data:

Biaxial (-), a=1.708, b=1.76, g=1.798, bire=0.0900, 2V(Calc)=78, 2V(Meas)=65.

Calculated Properties of Langite

Electron Density:

Bulk Density (Electron Density)=3.41 gm/cc
note: Specific Gravity of Langite =3.50 gm/cc.

Fermion Index:

Fermion Index = 0.0006843094
Boson Index = 0.9993156906

Photoelectric:

PE_Langite= 22.95 barns/electron
U=PE_Langite x rElectron Density= 78.31 barns/cc.

Radioactivity:

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

Langite Classification

Dana Class:

31.04.03.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.04)where (A+ B++)4 (XO4) Zq·x(H2O)

(31.04.03)Dana Group

31.04.03.01 Langite Cu4(SO4)(OH)6•2(H2O) Pc m

Strunz Class:

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

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DD -With only medium-sized cations; sheets of edge-sharing octahedra

07.DD.10 Langite Cu4(SO4)(OH)6•2(H2O) Pc m

07.DD.10 Posnjakite Cu4(SO4)(OH)6•(H2O) C 2/c 2/m

07.DD.10 Wroewolfeite Cu4(SO4)(OH)6•2(H2O) Pc m

Other Langite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

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

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Ask about Langite here :
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Print or Cut-and-Paste your Langite Specimen Label here :

Langite

Cu4(SO4)(OH)6•2(H2O)
Dana No: 31.04.03.01 Strunz No: 07.DD.10
Locality:

Notes: