Pearl Company Profile

Aggregated data from the web about Pearl

Company Name	Pearl
Website	https://en.wikipedia.org
Snippet	A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as fossil conulariids.Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) in minute crystalline form, which has deposited in concentric layers.
Color	white, pink, silver, cream, brown, green, blue, black, yellow, orange, red, gold, purple, iridescent
Streak	white
Category	Carbonate mineral, protein
Cleavage	None[1]
Fracture	Uneven,various
Dispersion	None
Pleochroism	Absent
Birefringence	0.156
Crystal system	Orthorhombic[1]
Refractive index	Common pearl: 1.52-1.66, Black pearl: 1.53-1.69[1]
Specific gravity	2.60–2.85[1]
Mohs scale hardness	2.5–4.5[1]
Strunz classification	05.8
Ultraviolet fluorescence	White pearls: light blue to light yellow;, Yellow and golden pearls: yellow-green, greenish brown to dark brown;, Black pearls: commonly pink to orange-red[2]
Formula.mw-parser-output .nobold{font-weight:normal}(repeating unit)	Calcium carbonate, CaCO3, Conchiolin

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