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Mineralpedia Details for Langite

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Langite

Langite

Named for Victor von Lang, a physicist, crystallographer, and Professor of Physics at the University of Vienna, in Austria. Uncommon, but wide spread, and can be found in England, Ireland, France, Slovakia, Germany, Italy, Namibia, Australia, the United States, Chile, among many others. Langite occurs as a secondary mineral in oxidized copper sulfide deposits, and may be of post-mine in origin.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/langite.pdf

Formula
Cu4SO4(OH)6·2H2
Crystal System
Monoclinic 
Crystal Habit
Concretionary, Fibrous, Earthy 
Cleavage
Perfect, Distinct, None 
Luster
Vitreous (Glassy) 
Color
blue green, green blue, sky blue 
Streak
greenish blue 
Class
Monoclinic - Domatic 
Fracture
Uneven 
Hardness
2.5-3 
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Langite from Majuba Hill mine, Pershing Co., Nevada, United States

Langite
            from Majuba Hill mine, Pershing Co., Nevada, United States Robin's egg blue crusts and sugary crystals with no definite crystal forms except peculiar tube-like structures to 1mm. Not sure what to make of these forms, perhaps they are a replacement with subsequent dissolution of the core leaving behind a harder rind.
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Langite from L'ubietová (Libethen), Banská Bystrica, Slovakia

Langite
            from L'ubietová (Libethen), Banská Bystrica, Slovakia

Deep bluish green micro crystals to about 0.2mm.

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Langite from Podlipa, Banská Bystrica Region, Slovakia

Langite
            from Podlipa, Banská Bystrica Region, Slovakia Superb green-blue tabular Langite microcrystals to <0.5mm absolutely covering matrix.
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Langite from Grandview mine, Coconino Co., Arizona, United States

Langite
            from Grandview mine, Coconino Co., Arizona, United States

Dull bluish green botryoidal crystals to 1mm. These crystals are distinguished from the Chalcoalumite in the same deposit by their dull luster on the surface and a silky luster on cross section. These crystals are actually composed of aggregates of very fine radial acicular crystals causing the silky luster. The Chalcoalumite has a more sugary and reflective luster and is also translucent, whereas the Langite is opaque.

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Langite from Piesky, Špania Dolina, Banská Bystrica, Slovakia

Langite
            from Piesky, Špania Dolina, Banská Bystrica, Slovakia

Fantastic micro blue crystals scattered across matrix. Nice peice.

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