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Chemical Analysis of Precious Stones

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410 THE CHEMICAL ANALYSIS OF PRECIOUS STONES.
I. THE CHEMICAL ANALYSIS OF PRECIOUS STONES.
BERYL: EMERALD.
Combination of glucina, silica, and alumina.
Native form: a hexaedral prism terminated in a six-sided pyramid, imbedded in a vein of magnesian limestone traversing hornblende rock.
CALCEDONY.
Agate, Heliotrope, Onyx, Plasma, Sard, are all varieties of Calcedony differently coloured by metallic oxides.
Native form: botryoidal (grape-like) masses ; but more frequently found in rolled pebbles.
DIAMOND.
Pure carbon. Sp. Gr. 3'55 (inferior to the Sapphire).
Hardness = 10, the highest in the scale. Highly electric by friction.
Native form : an octahedral crystal, usually modified by the obliteration of the angles and edges : found mixed with gold-dust in a hard ferruginous concreted gravel.
Jewelry of the Ancients Page of 453 Chemical Analysis of Precious Stones
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King. Natural History of Precious Stones.
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