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Langite

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Viktor von Lang (1838 – 1921)
Formula:
Cu4(SO4)(OH)6 · 2H2O
System:
Monoclinic
Colour:
Blue, greenish-blue
Lustre:
Vitreous, Silky
Hardness:
2½ - 3
Name:
Named for Victor von Lang (1838-1921), physicist and crystallographer, Professor of Physics, University of Vienna, Vienna, Austria.
Dimorph of:
A secondary copper mineral formed from the oxidation of copper sulphides.
Often forms pseudohexagonal twins. Some habits are easily confused with posnjakite and wroewolfeite.

May be altered to brochantite.

Classification of Langite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
7.DD.10

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
D : With only medium-sized cations; sheets of edge-sharing octahedra
31.4.3.1

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
4 : (AB)4(XO4)Zq·xH2O
25.2.9

25 : Sulphates
2 : Sulphates of Cu and Ag
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Type Occurrence of Langite

Year of Discovery:
1864

Physical Properties of Langite

Vitreous, Silky
Diaphaneity (Transparency):
Translucent
Comment:
Crusts somewhat silky.
Colour:
Blue, greenish-blue
Hardness (Mohs):
2½ - 3
Cleavage:
Distinct/Good
On {001} and {010}.
Density:
3.48 - 3.5 g/cm3 (Measured)    
Comment:
Measured values on Cornwall material.

Crystallography of Langite

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Cell Parameters:
a = 7.118Å, b = 6.031Å, c = 11.209Å
β = 90°
Ratio:
a:b:c = 1.18 : 1 : 1.859
Unit Cell Volume:
V 481.19 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals small; equant or elongated [100]; lath-like, scales; fibro-lamellar crusts; earthy.
Twinning:
Common on {110}. Repeated in part as aggregates flattened {001} rendering star-shaped twins.
Comment:
Space group Pc; metrically pseudo-orthorhombic

Crystallographic forms of Langite

Crystal Atlas:
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Langite no.1 - Goldschmidt (1913-1926)
Langite no.2 - Goldschmidt (1913-1926)
Langite no.3 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

View
Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.063 (10)
3.567 (9)
2.662 (7)
2.616 (7)
2.493 (8)
2.134 (9)
1.773 (7)

Optical Data of Langite

Type:
Biaxial (-)
RI values:
nα = 1.708 nβ = 1.760 nγ = 1.798
2V:
Measured: 65° , Calculated: 78°
Max Birefringence:
δ = 0.090
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v weak
Pleochroism:
Visible
Comments:
X = c = Light yellowish green
Y = b = Blue-green
Z = a = Sky-blue

Chemical Properties of Langite

Formula:
Cu4(SO4)(OH)6 · 2H2O
Essential elements:
All elements listed in formula:

Relationship of Langite to other Species

7.DD.05FelsőbányaiteAl4(SO4)(OH)10 · 4H2O
7.DD.10PosnjakiteCu4(SO4)(OH)6 · H2O
7.DD.10WroewolfeiteCu4(SO4)(OH)6 · 2H2O
7.DD.15SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
7.DD.20KtenasiteZn(Cu,Zn)4(SO4)2(OH)6 · 6H2O
7.DD.25ChristeliteCu2Zn3(SO4)2(OH)6 · 4H2O
7.DD.30CampigliaiteMn2+Cu4(SO4)2(OH)6 · 4H2O
7.DD.30DevillineCaCu4(SO4)2(OH)6 · 3H2O
7.DD.30OrthoserpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
7.DD.30SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
7.DD.30NiedermayriteCdCu4(SO4)2(OH)6 · 4H2O
7.DD.30EdwardsiteCu3Cd2(SO4)2(OH)6·4H2O
7.DD.35Carrboydite[(Ni1-xAlx)(OH)2][SO4]x/2 · nH2O
7.DD.35Glaucocerinite(Zn1-xAlx)(OH)2(SO4)x/2 · nH2O
7.DD.35Honessite(Ni1-xFex3+)(OH)2[SO4]x/2 · nH2O
7.DD.35Hydrohonessite(Ni1-xFex3+)(OH)2[SO4]x/2 · nH2O
7.DD.35MotukoreaiteMg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
7.DD.35Mountkeithite[(Mg1-xFex3+)(OH)2][SO4]x/2 · nH2O
7.DD.35ShigaiteMn6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
7.DD.35WermlanditeMg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2O
7.DD.35WoodwarditeCu1-xAlx(OH)2[SO4]x/2 · nH2O
7.DD.35ZincaluminiteZn6Al6(SO4)2(OH)16 · 5H2O
7.DD.35Hydrowoodwardite(Cu1-xAlx)(OH)2[SO4]x/2 · nH2O
7.DD.35ZincowoodwarditeZn1-xAlx(OH)2[SO4]x/2 · nH2O
7.DD.35NatroglaucoceriniteZn6Al3(OH)18[Na(H2O)6](SO4)2•6H2O
7.DD.35NikischeriteFe62+Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
7.DD.40Lawsonbauerite(Mn2+,Mg)9Zn4(SO4)2(OH)22 · 8H2O
7.DD.40Torreyite(Mg,Mn2+)72Mn22+Zn4(SO4)2(OH)22 · 8H2O
7.DD.45MooreiteMg92Mn2Zn4(SO4)2(OH)26 · 8H2O
7.DD.50Namuwite(Zn,Cu)4(SO4)(OH)6 · 4H2O
7.DD.55Bechererite(Zn,Cu)6Zn2(SO4,HSiO4)2(OH)12
7.DD.60Ramsbeckite(Cu,Zn)15(SO4)4(OH)22 · 6H2O
7.DD.65VonbezingiteCa6Cu3(SO4)3(OH)12 · 2H2O
7.DD.70RedgilliteCu6(SO4)(OH)10 · H2O
7.DD.75ChalcoalumiteCuAl4(SO4)(OH)12 · 3H2O
7.DD.75Nickelalumite(Ni,Cu)Al4(SO4,(NO3)2)(OH)12 · 3H2O
7.DD.75KyrgyzstaniteZnAl4(SO4)(OH)12·3H2O
7.DD.80Guarinoite(Zn,Co,Ni)6(SO4)(OH,Cl)10 · 5H2O
7.DD.80Schulenbergite(Cu,Zn)7(SO4,CO3)2(OH)10 · 3H2O
7.DD.80Thérèsemagnanite(Co,Zn,Ni)6(SO4)(OH,Cl)10 · 8H2O
7.DD.80UM1992-30-SO:CCuHZn(Zn,Cu)7(SO4,CO3)2(OH)10 · 3H2O
7.DD.85MontetrisaiteCu6(SO4)(OH)10 · 2H2O
25.2.1ChalcocyaniteCuSO4
25.2.2BonattiteCuSO4 · 3H2O
25.2.3ChalcanthiteCuSO4 · 5H2O
25.2.4BoothiteCuSO4 · 7H2O
25.2.5DolerophaniteCu2(SO4)O
25.2.6AntleriteCu3(SO4)(OH)4
25.2.7BrochantiteCu4(SO4)(OH)6
25.2.8PosnjakiteCu4(SO4)(OH)6 · H2O
25.2.10WroewolfeiteCu4(SO4)(OH)6 · 2H2O
25.2.11KröhnkiteNa2Cu(SO4)2 · 2H2O
25.2.12NatrochalciteNaCu2(SO4)2(OH) · 2H2O
25.2.13PiypiteK2Cu2(SO4)2O
25.2.14FedotoviteK2Cu3(SO4)3O
25.2.15CyanochroiteK2Cu(SO4)2 · 6H2O
25.2.16EuchlorineKNaCu3(SO4)3O
25.2.17DevillineCaCu4(SO4)2(OH)6 · 3H2O
25.2.18LeightoniteK2Ca2Cu(SO4)4 · 2H2O
25.2.19ChalcoalumiteCuAl4(SO4)(OH)12 · 3H2O
25.2.20CyanotrichiteCu4Al2(SO4)(OH)12 · 2H2O
25.2.21WoodwarditeCu1-xAlx(OH)2[SO4]x/2 · nH2O
25.2.22CampigliaiteMn2+Cu4(SO4)2(OH)6 · 4H2O
25.2.23GuilditeCuFe3+(SO4)2(OH) · 4H2O
25.2.24RansomiteCuFe2(SO4)4 · 6H2O
25.2.26KlyuchevskiteK3Cu3(Fe3+,Al)(SO4)4O2
25.2.27Poitevinite(Cu,Fe,Zn)SO4 · H2O
25.2.28ArgentojarositeAgFe33+(SO4)2(OH)6

Other Names for Langite

Name in Other Languages:
German:Langit
Russian:Лангит
Simplified Chinese:蓝铜矾
Spanish:Langita
Traditional Chinese:藍銅礬

Other Information

Other Information:
Insoluble in water. Readily soluble in acids or ammonia.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Langite

Reference List:
Field (1862) Philosophical Magazine and Journal of Science: 24: 123.

Maskelyne (1864) Philosophical Magazine and Journal of Science: 27: 316.

Maskelyne in: Pisani (1864) Comptes rendu de l’Académie des sciences de Paris: 59: 633.

Church (1865) Journal of the Chemical Society, London: 18: 87.

Maskelyne (1865) Philosophical Magazine and Journal of Science: 29: 473.

Brezina (1879) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 3: 374.

Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 961.

Goldschmidt, V. (1918) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 5: 116.

Hintze, Carl (1929) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [3B]: 4385.

Koritnig (1941) Zbl. Min.: 154.

Meixner (1941) Zbl. Min.: 11.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 583-585.

Bulletin de Mineralogie (1984): 107: 641-648.

Acta Crystallographica: C40: 1309-1311.

Internet Links for Langite

Specimens:
The following Langite specimens are currently listed for sale on minfind.com.

Localities for Langite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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