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Mineralpedia Details for Liroconite

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Liroconite

Liroconite

Named after the Greek words lieros and conis, meaning, respectfully, “pale” and “powder,” in reference to the minerals pale blue streak. Liroconite is a secondary mineral that can be found in some oxidized copper deposits. It occurs in England, Germany, Slovakia, Russia, and the United States, among just a couple others.

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

Formula
Cu2AlAsO4(OH)4·4H2
Crystal System
Monoclinic 
Crystal Habit
Euhedral Crystals, Granular 
Cleavage
Indistinct, Indistinct, None 
Luster
Vitreous - Resinous 
Color
light blue, green, sky blue, verdigris green 
Streak
light blue 
Class
Monoclinic - Prismatic 
Fracture
Sub Conchoidal 
Hardness
2-2.5 
WebMineral
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Mindat
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Liroconite from St. Day dist., Cornwall, England

Liroconite
            from St. Day dist., Cornwall, England

Flattened Liroconite crystals to 1mm totally covered by Cornwallite or perhaps Cornubite. The darker blue is most probably Clinoclase or possibly Connellite. Very interesting study specimen.

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Liroconite from Wheal Gorland, St. Day dist., Cornwall, England

Liroconite
            from Wheal Gorland, St. Day dist., Cornwall, England

Liroconite blue micro 0.75 to 1mm crystals from the type locality.

Bluish green crystals to 3mm.

Click thumbnail images for larger view.

Liroconite from Wheal Unity, St Day United mines, St Day dist., Cornwall, England

Liroconite
            from Wheal Unity, St Day United mines, St Day dist., Cornwall, England

This is a micromount in the box. The specimen is 1cm across and has very nice deep blue crystals to 1mm.

Click thumbnail images for larger view.

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