meliphanite
Detailed sheet
meliphanite
Discovered in 1852, its name comes from the Greek, “which resembles to honey” in connection with its honey-yellow color.
CHEMICAL CHARACTERISTICS
(Ca,Na)2(Be,Al)[(Si2O6](F,OH)
beryllium aluminium silicate mineral
PHYSICAL CHARACTERISTICS
Main color
yellow
Other colors
colourless, orange
Color of streak
white
Luster
vitreous
Hardness
5.0 to 5.5
Density
3.00 to 3.05
Cleavage
good
Fracture
splintery, uneven
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.590 - 1.612
Double refraction
0.019
definite uniaxial negative
visible double refraction
Yes
Pleochroism
very weak
Number of colors
2
light yellow, dark yellow
Fluorescence
none
CRYSTALS PROPERTIES
prismatic and tabular
crystals system
tetragonal
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
Few deposits in the world. It is found in Norway, where it was discovered (Telemark) and Vesfold , in Piedmont in Italy, Alaska and Russia.
use in jewelry
samples close to transparency are cut in facets, it’s a collection stone
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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