Hardness (or Mohs Hardness): 7.5
RI (Refractive Index): 1.76 to 1.81
SG (Specific Gravity): 3.80 to 4.20
Hardness (or Mohs Hardness): 7.5 to 8
RI (Refractive Index): 1.577 to 1.583 with birefringence from 0.005 to 0.009
SG (Specific Gravity): 2.67 to 2.84
Hardness (or Mohs Hardness): 6.5 to 7
RI (Refractive Index): 1.654 to 1.690 with a birefringence of 0.036
SG (Specific Gravity): 3.31 to 3.48
Hardness (or Mohs Hardness): 7.25
RI (Refractive Index): 1.74 to 1.760
SG (Specific Gravity): 3.70 to 3.80
Hardness (or Mohs Hardness): 7 à 7.5
RI (Refractive Index): 1.75 to 1.78
SG (Specific Gravity): 3.80 to 3.95
Hardness (or Mohs Hardness): 9
RI (Refractive Index): 1.762 to 1.774 with birefringence from 0.005 to 0.009
SG (Specific Gravity): 4
RI (Refractive Index): 1.76 to 1.780 Birefringence from 0.008 to 0.009
RI (Refractive Index): 1.79 to 1.82
SG (Specific Gravity): 4.1 to 4.2
Hardness (or Mohs Hardness): 8
RI (Refractive Index): 1,718 à 1,730
SG (Specific Gravity): 3,61 to 3,67
RI (Refractive Index): 1.692 to 1.706 with birefringence of 0.013 approximatively
SG (Specific Gravity): 3.35
RI (Refractive Index): 1.619 to 1.627 with birefringence from 0.008 to 0.010
SG (Specific Gravity): 3.53 to 3.56
Hardness (or Mohs Hardness): 7 to 7.5
RI (Refractive Index): 1.620 to 1.650 birefringence from 0.014 to 0.021
SG (Specific Gravity): 3.00 to 3.10
RI (Refractive Index): 1.730 to 1.750
SG (Specific Gravity): 3.40 to 3.80
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