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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 [...] The fixing of the specific gravity of a stone also determines its group position with regard to weight; its colour and other characteristics defining the actual stone. This is a safe and very common method of proving a stone, since its specific gravity does not vary more than a point or so in different [...] |
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