Langite Mineral Data

Langite Mineral Data +

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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).

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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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

Diaphaniety:

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

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:

r_electron=3.41 gm/cc
note: r_Langite=3.50 gm/cc.

Fermion Index

Fermion Index = 0.00068
Boson Index = 0.99932

Photoelectric:

PE_Langite= 22.95 barns/electron
U=PE_Langite x r_electron= 78.31 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Langite is Not Radioactive

Langite Classification

Dana Class:

31.4.3.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.4)where (A+ B++)4 (XO4) Zq·x(H2O)

(31.4.3)Dana Group

31.4.3.1 Langite Cu4(SO4)(OH)6·2(H2O) Pc m

Strunz Class:

VI/D.03-20 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size

VI/D.03 - Langite series, Posnjakite - Nakuriite

VI/D.03-10 Posnjakite Cu4(SO4)(OH)6·(H2O) C 2/c 2/m

VI/D.03-20 Langite Cu4(SO4)(OH)6·2(H2O) Pc m

VI/D.03-30 Wroewolfeite Cu4(SO4)(OH)6·2(H2O) Pc m

VI/D.03-40 Namuwite (Zn,Cu)4(SO4)(OH)6·4(H2O) Unk Hex

VI/D.03-50 Guarinoite (Zn,Co,Ni)6(SO4)(OH,Cl)10·5(H2O) P 6₃/m,P 6₃, or P 6₃22 Hex

VI/D.03-55 Theresemagnanite (Co,Zn,Ni)6(SO4)(OH,Cl)10·8(H2O) P 6₃ 6

VI/D.03-60 Schulenbergite (Cu,Zn)7(SO4,CO3)2(OH)10·3(H2O) P 3 or P 3- Trig

VI/D.03-65 Christelite! Zn3Cu2(SO4)2(OH)6·4(H2O) P1 1

VI/D.03-70 Ktenasite (Cu,Zn)5(SO4)2(OH)6·6(H2O) P 2₁/c 2/m

VI/D.03-75 Ramsbeckite (Cu,Zn)15(SO4)4(OH)22·6(H2O) P 2₁/a 2/m

VI/D.03-80 Campigliaite Cu4Mn(SO4)2(OH)6·4(H2O) C 2 2

VI/D.03-90 Nakauriite (Mn,Ni,Cu)8(SO4)4(CO3)(OH)6·48(H2O) Unk Ortho

Other Langite Information

References:

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

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Langite

Cu4(SO4)(OH)6·2(H2O)
Dana No: 31.4.3.1 Strunz No: VI/D.03-20
Locality:

Notes: