legrandite
yellow legrandite from Ojuela Mine, Mapimi, Mexico
Detailed sheet
legrandite
Identified in 1932 by Drugman and Hey, its name honors the Belgian mining engineer, Legrand.
CHEMICAL CHARACTERISTICS
Zn2[AsO4](OH) - H2O
hydrated zinc arsenate
PHYSICAL CHARACTERISTICS
Main color
yellow
Other colors
colourless, orange
Color of streak
white
Luster
vitreous
Hardness
4.5 to 5.0
Density
3.98 to 4.04
Cleavage
indistinct
Fracture
conchoidal, uneven
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.675 - 1.740
Double refraction
0.060
definite, biaxial (+)
visible double refraction
Yes
Dispersion
forte
Pleochroism
definite
Number of colors
2
colorless, yellow
Fluorescence
none
CRYSTALS PROPERTIES
thin prismatic, well shaped
crystals system
monoclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
Rare mineral, it is found in Tsumeb, Namibia, in Australia at Broken Hill, at Sterling Mine in the United States and in Mexico: in Chihuahua and Durango, where fine specimens are found.
use in jewelry
cut in facets it’s a collection stone
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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