Moonstone
Gemstone
>
Moonstone is a sodium potassium aluminium silicate of the feldspar group that displays a pearly and opalescent schiller. An alternative name for moonstone is hecatolite. Wikipedia
Hardness (Mohs hardness scale): 6 – 6.5
Chemical formula: (Na,Ca)Al₁₋₂Si₃₋₂O₈ and KAlSi₃O₈
Birth month: June
Category: Orthoclase variety
Cleavage: perfect
Crystal system: Monoclinic