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Langite Mineral Data

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General Langite Information

Help on Chemical  Formula: Chemical Formula: Cu4(SO4)(OH)6•2(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Cu4(SO4)(OH)6•2(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1864
Help on Locality: Locality: Fowey Consols, Tywardreath, Par Area, St Austell District, Cornwall, England, UK Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Viennese physicist, V. von Lang (1838-1921).
Help on Name Pronunciation: Name Pronunciation: Langite Say LANGITE
Help on Synonym: Synonym: ICSD 201837
  PDF 43-671

Langite Image

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

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.1796:1:1.8576
Help on Cell Dimensions: Cell Dimensions: a = 7.118, b = 6.034, c = 11.209, Z = 2; beta = 90.02° V = 481.43 Den(Calc)= 3.37
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Pc
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

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

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Physical Properties of Langite

Help on Cleavage: Cleavage: {001} Perfect, {010} Distinct
Help on Color: Color: Blue green, Green blue, Sky blue.
Help on Density: Density: 3.5
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Concretionary - Rounded massive fine-grained materials.
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: greenish blue

Optical Properties of Langite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.41 gm/cc
note: Specific Gravity of Langite =3.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0006843094
Boson Index = 0.9993156906
Help on Photoelectric: Photoelectric: PELangite = 22.95 barns/electron
U=PELangite x rElectron Density= 78.31 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Langite is Not Radioactive

Langite Classification

Help on  Dana Class: Dana Class: (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.04)where (A+ B++)4 (XO4) Zq�x(H2O)
  (31.04.03)Dana Group Langite Cu4(SO4)(OH)6•2(H2O) Pc m
Help on  Strunz Class: 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

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: 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

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Dana No: Strunz No: 07.DD.10





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