thaumasite
thaumasite crystals of South Africa
Detailed sheet
thaumasite
Discovered in Sweden in 1878, its name comes from the Greek “thaumasion” which means surprising, in relation to its amazing chemical composition.
CHEMICAL CHARACTERISTICS
Ca3Si(CO3)(SO4)(OH)6 - 12(H2O)
complex sulfate
PHYSICAL CHARACTERISTICS
Main color
colourless
Other colors
white, grey, yellow
Color of streak
white
Luster
silky, vitreous
Hardness
3.5 to 0.0
Density
1.90 to 0.00
Cleavage
indistinct
Fracture
uneven
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.462 - 1.505
Double refraction
0.035
definite uniaxial negative
visible double refraction
Yes
Dispersion
-
Pleochroism
absent
Number of colors
1
Fluorescence
weak
white
CRYSTALS PROPERTIES
often acicular or radial, and hexagonal prisms
crystals system
hexagonal
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in South Africa, in Namibia (Tsumeb), Australia (Tasmania), Japan, the USA, Europe.
use in jewelry
it is cut in facets, it’s a collection stone
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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