gilalite
Detailed sheet
gilalite
Discovered in 1980 at Christmas Mine in Arizona United States, it is best known as blue-green inclusion in Brazilian quartz.
CHEMICAL CHARACTERISTICS
Cu5[Si6O7] - 7H2O
hydrated copper silicate
PHYSICAL CHARACTERISTICS
Main color
blue
Other colors
green
blue - green shades or green - bluish
Color of streak
green
Luster
silky, vitreous
Hardness
2.0 to 2.5
Density
2.80 to 2.90
Fracture
too small crystals to be identified
OPTICAL PROPERTIES
Transparency
translucent
sometimes transparent as quartz inclusions
Refractive index
1.560 - 1.640
Double refraction
0.060
definite, biaxial (-)
visible double refraction
No
Number of colors
1
undetectable pleochroism
Fluorescence
none
Inclusions
constitutes inclusions in quartz
CRYSTALS PROPERTIES
very thin needle shaped crystal clusters
crystals system
monoclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
Rare mineral, is found in Brazil in the state of Paraiba in Salgadinho (Sao Jose de Batalha), in the United States in Arizona at Christmas Mine in Gila County and Boss Mine in Nevada, in Greece in the historic mine of Laurion.
use in jewelry
None, except for its beautiful turquoise color when in transparent inclusion in quartz.
Daily care
and precautions
very fragile for the weak hardness ( like the Gypse ) and the thinness of its crystals
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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