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Yellow radiating prismatic crystals on limonite
Chemical formulaZn2(AsO4)(OH)·(H2O)
ColorYellow or yellowish orange to colourless
Crystal habitCrystalline, prismatic
Crystal systemMonoclinic
CleavageImperfect, poor in one direction
FractureBrittle, conchoidal
Mohs Scale hardness4.5-5
Refractive index1.675-1.74
Specific gravity4.0

Legrandite is a rare arsenate mineral, discovered in 1934 and named after the Belgian mining engineer Legrand. Chemically, it is a hydrated zinc arsenate hydroxide, found as a secondary mineral in zinc ores, often in association with limonite. The most notable source of the mineral is the now abandoned Ojuela mine in Durango, Mexico. It is highly praised for its vitreous rich yellow colour and is a desirable item among mineral collectors.


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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Legrandite". A list of authors is available in Wikipedia.
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