aenigmatite
Detailed sheet
aenigmatite
Discovered in 1865 its name comes from Greek showing that its chemical formula was a real “mystery” to solve.
CHEMICAL CHARACTERISTICS
Na2Fe5Ti[Si6O18]O2
complex silicate
PHYSICAL CHARACTERISTICS
Main color
black
Other colors
brown, grey
velvety black
Color of streak
brown, red
Luster
adamantine, greasy
Hardness
5.5 to 6.0
Density
3.70 to 3.90
Cleavage
good
Fracture
uneven
OPTICAL PROPERTIES
Transparency
opaque, translucent
Refractive index
1.780 - 1.900
Double refraction
0.090
strong biaxial (+)
visible double refraction
No
Pleochroism
definite
Number of colors
3
different shades of brown to black, but difficult to observe
Fluorescence
none
CRYSTALS PROPERTIES
lamellaror prismatic
crystals system
triclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in Russia’s Kola Peninsula, Scotland, Greenland, Canada, United States, Tasmania, Australia, China …
use in jewelry
only a collection stone, rarely cut
Other
Gems
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