triphylite
triphyllite crystals from U.S.
staining type inclusions
Detailed sheet
triphylite
Its name comes from the Greek “tria” for 3 and “phylon” family to signify that it contains three cations because it was believed that it contained lithium, magnesium and iron.
CHEMICAL CHARACTERISTICS
LiFe[PO4]
lithium and iron phosphate
PHYSICAL CHARACTERISTICS
Main color
brown
Other colors
blue, grey, black, orange, green
Color of streak
white, grey
Luster
greasy, resinous, vitreous
Hardness
4.0 to 5.0
Density
3.35 to 3.60
Cleavage
perfect
Fracture
uneven
small areas on the fracture
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.689 - 1.703
Double refraction
0.007
very weak, biaxial (+)
visible double refraction
No
Dispersion
+/-
Pleochroism
absent
Number of colors
1
brown triphylite spectrum system
Fluorescence
none
CRYSTALS PROPERTIES
prismatic
crystals system
orthorhombic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in Brazil (Conselheiro Pena), Australia, Rwanda, Austria, Germany, the United States, Canada, Pakistan.
use in jewelry
it is faceted, emerald cut, it’s a collection stone
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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