Today's gem:
Lapis Lazuli
Formula: Na7Ca(Al6Si6O24)(SO4)(S3) Β· H2O from lazurite, FeS2 from pyrite, CaCO3 from calcite, and CaMgSi2O6 from diopside
Color: Mainly blue (from lazurite), white (calcite) and metallic yellow (pyrite)
Hardness: 5.5
A metamorphic rock composed primarily of lazurite and various other minerals; it's name is from the Latin lapis (stone) and the Persian lazhward (blue). It has been used throughout the centuries as a semi-precious stone and crushed into powder to produce the ultramarine pigment. In Ancient Egypt, this stone was used in amulets and ornaments and in Ancient Rome, associated with royalty.
Representation on media:
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