clinohumite
clinohumite crystal from Tajikistan
emerald cut clinohumite from Tajikistan
clinohumite from Tajikistan
tubes like inclusions or discontinuous needles
Detailed sheet
clinohumite
Discovered in 1876, on mont Vesuvius in Italy, it honors the name of the mineralogist Sir Abraham Hume (1749-1838).
Some clinohumite gemstone was first discovered in Tajikistan, than Pamir, and then later in Vietnam.
CHEMICAL CHARACTERISTICS
(Mg,Fe)9[(SiO4]4(F,OH)2
iron - magnesium fluoride silicate
PHYSICAL CHARACTERISTICS
Main color
orange
Other colors
white, brown, yellow, red
the bright orange variety is the most sought
Color of streak
white
Luster
resinous, vitreous
Hardness
6.0 to 6.5
Density
3.12 to 3.77
Cleavage
indistinct
Fracture
conchoidal
OPTICAL PROPERTIES
Transparency
transparent
Refractive index
1.630 - 1.675
Double refraction
0.028
definite, biaxial positive
visible double refraction
Yes
Dispersion
-
Pleochroism
weak
Number of colors
2
yellow, colorless
Fluorescence
weak
orange, with short UV
CRYSTALS PROPERTIES
prismatic rarely large and well-shaped
crystals system
monoclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
Orange crystals of gem quality come from the Pamir in Tajikistan (Spinel Mines) and some red crystals from Siberia in Russia. Also some orange crystals can be found in Vietnam.
It also can be found in China, Australia, USA, Brazil, Austria, Canada.
use in jewelry
It is faceted, and may be used in jewelry.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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