augite
augite crystal from Auvergne in France
Detailed sheet
augite
Its name, coming from Latin, was given by Werner and it means bright because the surfaces of its divisions are very bright.
Amongst the pyroxenes, augite is a ferromagnesian silicate low in calcium. The fassaite variety is low in iron, the jeffersonite variety is rich in manganese and zinc and astéroite is rich in iron. There is even a titanium rich variety : the titanaugite.
The augite may be seen as the sodic pole of calcic clinopyroxenes where the pole rich in calcium would be the diopside / hedenbergite.
CHEMICAL CHARACTERISTICS
(Ca,Na)(Mg,Fe,Al,Ti) [(Si,Al)2O6]
iron magnesium and calcium inosilicate
PHYSICAL CHARACTERISTICS
Main color
black
Other colors
brown, grey, green, purple
always very dark with sometimes green, purple and brown shades
Color of streak
brown, green
Luster
resinous, vitreous
Hardness
5.5 to 6.0
Density
3.20 to 3.60
Cleavage
perfect
Fracture
uneven
definite and bright cleavage
OPTICAL PROPERTIES
Transparency
opaque, translucent
Refractive index
1.680 - 1.770
Double refraction
0.025
definite, biaxial (+)
visible double refraction
No
Dispersion
-
Pleochroism
definite
Number of colors
3
shades of green, brown and purple
Fluorescence
none
CRYSTALS PROPERTIES
prismatic sometimes biterminal crystals
crystals system
monoclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found worldwide in igneous and metamorphic rocks. It is found even in meteorites. Fassaite is found in Slovakia (Stiavnica Banka) and Italy in the Trentino region.
The augite crystals are also found in Ontario, Canada, in Utah and especially in Oregon in United States, in the Canary Islands in Spain, Mount Vesuvius in Italy, in France in the Massif Central …
use in jewelry
it is cut in facets or cabochon, it’s a collection stone that can be very bright
Daily care
and precautions
Fragile by its easy cleavage. Insensitive to household products.
Historical
healing properties
The augite is the stone of changes. It would encourage acceptance of changes, promote them
and prepare the individuals for them.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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