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Mineralpedia Details for Legrandite

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Legrandite

Legrandite

Named for a Belgian mine engineer known only as a Mr. Legrand, who was the first to collect the mineral. An uncommon mineral that occurs in oxidized zinc-arsenic bearing deposits, and can be found, albeit rarely, in granite pegmatites. Localities for Legrandite include in Mexico, Namibia, the United States, Japan, and Brazil.

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

Formula
Zn2AsO4(OH)┬ĚH2
Crystal System
Monoclinic 
Crystal Habit
Crystalline - Fine, Prismatic 
Cleavage
Imperfect, None, None 
Luster
Vitreous (Glassy) 
Color
yellow, yellowish orange 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
4-5 
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Legrandite from Mina Ojuela, Mapimi, Durango, Mexico

Legrandite
            from Mina Ojuela, Mapimi, Durango, Mexico

Yellow prismatic crystal to 5mm.

This group of acicular crystals 1.5 x 1.5cm.

Golden yellow group of prismatic Legrandite crystals to 1.5cm.

Yellow thin prismatic crystals to 1mm.

Dozens of yellow odd-shaped, blocky to prismatic crystals Legrandite to 5mm.

Rare zinc arsenate with yellow, glassy prismatic crystals the largest of which is 5mm. 

Click thumbnail images for larger view.

Legrandite from Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States

Legrandite
            from Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States

Yellow scaly or platy crystals on surface.

Click thumbnail images for larger view.

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