. Precious stones, a popular account of their characters, occurrence and applications, with an introduction to their determination, for mineralogists, lapidaries, jewellers, etc. With an appendix on pearls and coral. Precious stones; Pearls; Corals. CHRYSOBERYL 301 Chrysoberyl has no distinct cleavage but a conchoidal fracture. It is brittle and very hard (H = 8|), and has a specific gravity of 3-68 to 3-78. It is unattacked by acids and infusible before the blowpipe. When rubbed it becomes positively electrified and retains its charge for several hours. Ihe lustre of chrysoberyl is vitreous o
. Precious stones, a popular account of their characters, occurrence and applications, with an introduction to their determination, for mineralogists, lapidaries, jewellers, etc. With an appendix on pearls and coral. Precious stones; Pearls; Corals. CHRYSOBERYL 301 Chrysoberyl has no distinct cleavage but a conchoidal fracture. It is brittle and very hard (H = 8|), and has a specific gravity of 3-68 to 3-78. It is unattacked by acids and infusible before the blowpipe. When rubbed it becomes positively electrified and retains its charge for several hours. Ihe lustre of chrysoberyl is vitreous or slightly inclined to greasy in chai-acter; the mineral takes, and on account of its great hardness retains unaltered, a very brilliant polish. With regard to transparency the mineral is very variable, some specimens being beautifully. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bauer, Max, 1844-1917; Spencer, Leonard James, 1870- tr. London, C. Griffin and Company, Ltd.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectpreciousstones, booky
