ludlamite
CHEMICAL CHARACTERISTICS
(Fe,Mg,Mn)[PO4]2 - 4H2O
hydrated iron phosphate, magnesium and manganese
PHYSICAL CHARACTERISTICS
Main color
green
Other colors
colourless
apple green shades
Color of streak
white
Luster
pearly, vitreous
Hardness
3.0 to 4.0
Density
3.10 to 3.20
Cleavage
perfect
Fracture
conchoidal, uneven
pearly on the cleavage
OPTICAL PROPERTIES
Transparency
translucent
Refractive index
1.650 - 1.698
Double refraction
0.038
definite, biaxial (+)
visible double refraction
No
Dispersion
+
Pleochroism
absent
Number of colors
1
Fluorescence
none
CRYSTALS PROPERTIES
Thick prisms often biterminals when well crystallized
crystals system
monoclinic
OTHER INFORMATIONS
APPROACHING GEMS
Exploited
sites
It is found in Bolivia, the United States (New Hampshire, California, New Mexico, South Dakota), Switzerland (Ticino), Portugal, England (Cornwall), Germany (Bavaria).
use in jewelry
collection stone, very rarely transparent
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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