orthorhombic
Pearl
CaCO3 (aragonite) + conchiolin
Quick Facts
Hardness
2.5-4.5
Specific Gravity
2.60-2.85
Refractive Index
1.52-1.69
Crystal Structure
orthorhombic[mmm]:{110}@1.0 + {011}@0.7 + {101}@0.6 orthorhombic
mmm
{110} {011} {101}
Physical Properties
Crystal Systemorthorhombic
Hardness (Mohs)2.5-4.5
Specific Gravity2.60-2.85
FractureUneven
LustrePearly (nacreous)
Optical Properties
Refractive Index1.52-1.69
PleochroismNone
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Open in Playground orthorhombic[mmm]:{110}@1.0 + {011}@0.7 + {101}@0.6 Related Minerals
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