Pearl

Color	White, Blue, Green, Yellow, Orange, Brown, Pink, Purple, Gray, Black, Multicolored
Hardness	2.5 - 4.5
Crystal System	Amorphous
Refractive Index	1.52 - 1.69
SG	2.6 - 2.8
Transparency	Opaque
Double Refraction	.156
Luster	Pearly
Cleavage	None
Mineral Class	Calcium carbonate and conchiolin (organic) combined with water