phosgenite
phosgenite crystal from Sardinia in Italy
liquid like inclusions, tubes
Detailed sheet
phosgenite
Discovered in England, its name comes from the Greek “phos” meaning “light” and “genan” – “which leads “, in connection with its lights characteristic, was given by Haidinger. Karsten, who had described it in the early nineteenth century had named it hornblei.
CHEMICAL CHARACTERISTICS
Pb2[Cl2/CO3]
chloro-lead carbonate
PHYSICAL CHARACTERISTICS
Main color
colourless
Other colors
white, brown, grey, yellow, pink, green
shades of light colors
Color of streak
white
Luster
adamantine
Hardness
2.0 to 3.0
Density
6.00 to 6.30
Cleavage
perfect
Fracture
conchoidal
It is sectile
OPTICAL PROPERTIES
Transparency
transparent
Refractive index
2.115 - 2.145
Double refraction
0.028
definite uniaxial positive but sometimes biaxial
visible double refraction
No
Dispersion
-
Pleochroism
very weak
Number of colors
2
when visible : red, green
Fluorescence
weak
orange yellow
CRYSTALS PROPERTIES
short prisms,massive agregates
crystals system
tetragonal
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It has been found in France in the lead mines (Ussel in Corrèze), also in Italy, Namibia, Australia, Morocco, the United States, Mexico, Argentina, England, Ireland, Poland .
use in jewelry
very fragile collection stone, it is cut in facets
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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