pyrophyllite
Detailed sheet
pyrophyllite
Uncommon mineral, present in hydrothermal veins.
Its name comes from the Greek “pyros” for fire and “phyllos” as sheet, because with the heat this mineral is exfoliating, and swells in superposed sheets.
CHEMICAL CHARACTERISTICS
Al2[Si4O10](OH)2
basic aluminum phyllosilicate
PHYSICAL CHARACTERISTICS
Main color
brown
Other colors
white, grey, yellow, green
Color of streak
white
Luster
pearly
Hardness
1.0 to 2.0
Density
2.60 to 2.90
Cleavage
perfect
Fracture
even
cleaves in flexible strips
OPTICAL PROPERTIES
Transparency
opaque, translucent
Refractive index
1.533 - 1.605
Double refraction
0.045
visible double refraction
No
Dispersion
-
Pleochroism
absent
Number of colors
1
negative bi- axial
Fluorescence
none
Inclusions
rutile
CRYSTALS PROPERTIES
prismatic, fiber - radial aggregates
crystals system
triclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
Present in many deposits but relatively uncommon. It is found in Namibia in Africa, Australia, Tasmania, Chile, Ecuador, China, Uzbekistan, Slovakia, Germany, Sweden, the United States, Canada, British Columbia.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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