Group D. -Stones whose specific gravity lies between 3 and under 3.50.
Rhodonite 3.413 and occasionally to 3.617
Garnets 3.400 ” 4.500
Epidote 3.360 ” 3.480
Sphene 3.348 and occasionally to 3.420
Idocrase 3.346 ” 3.410
Olivine 3.334 ” 3.368
Chrysolite 3.316 ” 3.528
Jade 3.300 ” 3.381
Jadeite 3.299
Axinite 3.295
Dioptase 3.289
Diopside 2.279
Tourmaline (yellow) 3.210
Andalusite 3.204
Apatite 3.190
Tourmaline (Blue and Violet) 3.160
Tourmaline (Green) 3.148
Tourmaline (Red) 3.100
Spodumene 3.130 and occasionally to 3.200
Euclase 3.090
Fluorspar 3.031 and occasionally to 3.200
Tourmaline (Colourless) 3.029
Tourmaline (Blush Rose) 3.024
Tourmaline (Black) 3.024 and occasionally to 3.300
Nephrite 3.019
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