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Langite

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Formula:
Cu
 
4
(SO
 
4
)(OH)
 
6
· 2H
 
2
O
System:MonoclinicColour:Blue, greenish-blue
Lustre:Vitreous, SilkyHardness:2½ - 3
Name:
Named for Victor von Lang (1838-1921), physicist and crystallographer, Professor of Physics, University of Vienna, Vienna, Austria.
Dimorph of:Wroewolfeite


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

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:6/D.03-20
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:31.4.3.1

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
4 : (AB)4(XO4)Zq·xH2O
Hey's CIM Ref.:25.2.9

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

Co-type Localities:Fowey Consols (incl. Wheal Treasure; Wheal Fortune; Wheal Chance), Tywardreath, St Austell District, Cornwall, England, UK
St Just, St Just District, Cornwall, England, UK
Year of Discovery:1864

Physical Properties of Langite

Lustre: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 (measured):3.48 - 3.5 g/cm3
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
Crystal Atlas:
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Langite no.1 - Goldschmidt (1913-1926)
Langite no.2 - Goldschmidt (1913-1926)
Langite no.3 - Goldschmidt (1913-1926)

About Crystal Atlas

The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. The 3d models and HTML5 code are kindly provided by www.smorf.nl.

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Opaque | Translucent | Transparent

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X-Ray Powder Diffraction:
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°
Maximum Birefringence:δ = 0.090

Chart 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:
Cu
 
4
(SO
 
4
)(OH)
 
6
· 2H
 
2
O
Simplified for copy/paste:Cu4(SO4)(OH)6·2H2O
Essential elements:Cu, H, O, S
All elements listed in formula:Cu, H, O, S

Relationship of Langite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.DD.05Felsőbányaite
Al
 
4
(SO
 
4
)(OH)
 
10
· 4H
 
2
O
7.DD.10Posnjakite
Cu
 
4
(SO
 
4
)(OH)
 
6
· H
 
2
O
7.DD.10Wroewolfeite
Cu
 
4
(SO
 
4
)(OH)
 
6
· 2H
 
2
O
7.DD.15Spangolite
Cu
 
6
Al(SO
 
4
)(OH)
 
12
Cl · 3H
 
2
O
7.DD.20Ktenasite
Zn(Cu,Zn)
 
4
(SO
 
4
)
 
2
(OH)
 
6
· 6H
 
2
O
7.DD.25Christelite
Cu
 
2
Zn
 
3
(SO
 
4
)
 
2
(OH)
 
6
· 4H
 
2
O
7.DD.30Campigliaite
Mn
2+
 
Cu
 
4
(SO
 
4
)
 
2
(OH)
 
6
· 4H
 
2
O
7.DD.30Devilline
CaCu
 
4
(SO
 
4
)
 
2
(OH)
 
6
· 3H
 
2
O
7.DD.30Orthoserpierite
Ca(Cu,Zn)
 
4
(SO
 
4
)
 
2
(OH)
 
6
· 3H
 
2
O
7.DD.30Serpierite
Ca(Cu,Zn)
 
4
(SO
 
4
)
 
2
(OH)
 
6
· 3H
 
2
O
7.DD.30Niedermayrite
CdCu
 
4
(SO
 
4
)
 
2
(OH)
 
6
· 4H
 
2
O
7.DD.30Edwardsite
Cu
 
3
Cd
 
2
(SO
 
4
)
 
2
(OH)
 
6
·4H
 
2
O
7.DD.35Carrboydite
[(Ni
 
1-x
Al
 
x
)(OH)
 
2
][SO
 
4
]
 
x/2
· nH
 
2
O
7.DD.35Glaucocerinite
(Zn
 
1-x
Al
 
x
)(OH)
 
2
(SO
 
4
)
 
x/2
· nH
 
2
O
7.DD.35Honessite
(Ni
 
1-x
Fe
3+
x
)(OH)
 
2
[SO
 
4
]
 
x/2
· nH
 
2
O
7.DD.35Hydrohonessite
(Ni
 
1-x
Fe
3+
x
)(OH)
 
2
[SO
 
4
]
 
x/2
· nH
 
2
O
7.DD.35Motukoreaite
Mg
 
6
Al
 
3
(OH)
 
18
[Na(H
 
2
O)
 
6
][SO
 
4
]
 
2
· 6H
 
2
O
7.DD.35Mountkeithite
[(Mg
 
1-x
Fe
3+
x
)(OH)
 
2
][SO
 
4
]
 
x/2
· nH
 
2
O
7.DD.35Shigaite
Mn
 
6
Al
 
3
(OH)
 
18
[Na(H
 
2
O)
 
6
][SO
 
4
]
 
2
· 6H
 
2
O
7.DD.35Wermlandite
Mg
 
7
Al
 
2
(OH)
 
18
[Ca(H
 
2
O)
 
6
][SO
 
4
]
 
2
· 6H
 
2
O
7.DD.35Woodwardite
Cu
 
1-x
Al
 
x
(OH)
 
2
[SO
 
4
]
 
x/2
· nH
 
2
O
7.DD.35Zincaluminite
Zn
 
6
Al
 
6
(SO
 
4
)
 
2
(OH)
 
16
· 5H
 
2
O
7.DD.35Hydrowoodwardite
(Cu
 
1-x
Al
 
x
)(OH)
 
2
[SO
 
4
]
 
x/2
· nH
 
2
O
7.DD.35Zincowoodwardite
Zn
 
1-x
Al
 
x
(OH)
 
2
[SO
 
4
]
 
x/2
· nH
 
2
O
7.DD.35Natroglaucocerinite
Na
 
x
Zn
 
8-y
Al
 
y
(SO
 
4
)
 
(x+y)/2
(OH)
 
16
· 6H
 
2
O
7.DD.35Nikischerite
Fe
2+
6
Al
 
3
(OH)
 
18
[Na(H
 
2
O)
 
6
][SO
 
4
]
 
2
· 6H
 
2
O
7.DD.40Lawsonbauerite
(Mn
2+
 
,Mg)
 
9
Zn
 
4
(SO
 
4
)
 
2
(OH)
 
22
· 8H
 
2
O
7.DD.40Torreyite
(Mg,Mn
2+
 
)
 
7
 
2
Mn
2+
2
Zn
 
4
(SO
 
4
)
 
2
(OH)
 
22
· 8H
 
2
O
7.DD.45Mooreite
Mg
 
9
 
2
Mn
 
2
Zn
 
4
(SO
 
4
)
 
2
(OH)
 
26
· 8H
 
2
O
7.DD.50Namuwite
(Zn,Cu)
 
4
(SO
 
4
)(OH)
 
6
· 4H
 
2
O
7.DD.55Bechererite
(Zn,Cu)
 
6
Zn
 
2
(SO
 
4
,HSiO
 
4
)
 
2
(OH)
 
12
7.DD.60Ramsbeckite
(Cu,Zn)
 
15
(SO
 
4
)
 
4
(OH)
 
22
· 6H
 
2
O
7.DD.65Vonbezingite
Ca
 
6
Cu
 
3
(SO
 
4
)
 
3
(OH)
 
12
· 2H
 
2
O
7.DD.70Redgillite
Cu
 
6
(SO
 
4
)(OH)
 
10
· H
 
2
O
7.DD.75Chalcoalumite
CuAl
 
4
(SO
 
4
)(OH)
 
12
· 3H
 
2
O
7.DD.75Nickelalumite
(Ni,Cu)Al
 
4
(SO
 
4
,(NO
 
3
)
 
2
)(OH)
 
12
· 3H
 
2
O
7.DD.75Kyrgyzstanite
ZnAl
 
4
(SO
 
4
)(OH)
 
12
·3H
 
2
O
7.DD.80Guarinoite
(Zn,Co,Ni)
 
6
(SO
 
4
)(OH,Cl)
 
10
· 5H
 
2
O
7.DD.80Schulenbergite
(Cu,Zn)
 
7
(SO
 
4
,CO
 
3
)
 
2
(OH)
 
10
· 3H
 
2
O
7.DD.80Thérèsemagnanite
(Co,Zn,Ni)
 
6
(SO
 
4
)(OH,Cl)
 
10
· 8H
 
2
O
7.DD.80UM1992-30-SO:CCuHZn
(Zn,Cu)
 
7
(SO
 
4
,CO
 
3
)
 
2
(OH)
 
10
· 3H
 
2
O
7.DD.85Montetrisaite
Cu
 
6
(SO
 
4
)(OH)
 
10
· 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
25.2.1Chalcocyanite
CuSO
 
4
25.2.2Bonattite
CuSO
 
4
· 3H
 
2
O
25.2.3Chalcanthite
CuSO
 
4
· 5H
 
2
O
25.2.4Boothite
CuSO
 
4
· 7H
 
2
O
25.2.5Dolerophanite
Cu
 
2
(SO
 
4
)O
25.2.6Antlerite
Cu
 
3
(SO
 
4
)(OH)
 
4
25.2.7Brochantite
Cu
 
4
(SO
 
4
)(OH)
 
6
25.2.8Posnjakite
Cu
 
4
(SO
 
4
)(OH)
 
6
· H
 
2
O
25.2.10Wroewolfeite
Cu
 
4
(SO
 
4
)(OH)
 
6
· 2H
 
2
O
25.2.11Kröhnkite
Na
 
2
Cu(SO
 
4
)
 
2
· 2H
 
2
O
25.2.12Natrochalcite
NaCu
 
2
(SO
 
4
)
 
2
(OH) · 2H
 
2
O
25.2.13Piypite
K
 
2
Cu
 
2
(SO
 
4
)
 
2
O
25.2.14Fedotovite
K
 
2
Cu
 
3
(SO
 
4
)
 
3
O
25.2.15Cyanochroite
K
 
2
Cu(SO
 
4
)
 
2
· 6H
 
2
O
25.2.16Euchlorine
KNaCu
 
3
(SO
 
4
)
 
3
O
25.2.17Devilline
CaCu
 
4
(SO
 
4
)
 
2
(OH)
 
6
· 3H
 
2
O
25.2.18Leightonite
K
 
2
Ca
 
2
Cu(SO
 
4
)
 
4
· 2H
 
2
O
25.2.19Chalcoalumite
CuAl
 
4
(SO
 
4
)(OH)
 
12
· 3H
 
2
O
25.2.20Cyanotrichite
Cu
 
4
Al
 
2
(SO
 
4
)(OH)
 
12
· 2H
 
2
O
25.2.21Woodwardite
Cu
 
1-x
Al
 
x
(OH)
 
2
[SO
 
4
]
 
x/2
· nH
 
2
O
25.2.22Campigliaite
Mn
2+
 
Cu
 
4
(SO
 
4
)
 
2
(OH)
 
6
· 4H
 
2
O
25.2.23Guildite
CuFe
3+
 
(SO
 
4
)
 
2
(OH) · 4H
 
2
O
25.2.24Ransomite
CuFe
 
2
(SO
 
4
)
 
4
· 6H
 
2
O
25.2.26Klyuchevskite
K
 
3
Cu
 
3
(Fe
3+
 
,Al)(SO
 
4
)
 
4
O
 
2
25.2.27Poitevinite
(Cu,Fe,Zn)SO
 
4
· H
 
2
O
25.2.28Argentojarosite
AgFe
3+
3
(SO
 
4
)
 
2
(OH)
 
6

Other Names for Langite

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 Warning: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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Langite details from Handbook of Mineralogy (PDF)
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  • Specimens:The following Langite specimens are currently listed for sale on minfind.com.

    Localities for Langite

    The 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.
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