Chemistry: Isomorphous combination hauynite and sodalite.
Crystal system: Cubic; rarely dodecahedral or compact masses in aggregate.
Color: dark blue or greenish blue
Hardness: 5.5
Cleavage: Imperfect: dodecahedral.
Specific gravity: 2.7 – 2.9
Refractive index: 1.50 mean
Luster: Dull to greasy.
Dispersion: -
Dichroism: -
Occurrence: In limestones as a result of contact metamorphism.
Notes
Lapis lazuli is a complex aggregate of hauynite, sodalite, noselite and lazurite; inclusions: pyrite, calcite.
No comments:
Post a Comment