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Cat's eye

Cat's eye Page of 243 Olivine Text size:minus plus Restore normal size   Mail page  Print this page
OLIVINE.
155
LXIX.
OLIVINE.
Silicate of magnesia, which receives the name from its colour.
It is like the chrysolite, but less transparent and less hard. It is coloured with iron. It is found in masses and also in round pebbles, as frequently in France as in Italy, Scotland, Bohemia, Ireland, on Vesuvius, and in many other places.
The cleavage of the olivine is imperfectly double, and its breakage is unequal and granulous.
Its specific gravity is equal to 3ยท240. Analysed it yields
Subjected to the action of the blow-pipe, with the addition of borax, it forms an opaque button of dark glass: When put into concentrated acetic acid it loses colour; this phenomenon indicates a great porosity, most rare in the texture of gems of this kind, and a principal sign by which to distinguish it from those which resemble it.
Olivine is found in pieces large and small, in basalts, in porphyry, and in lava : it is almost always with pyroxenic augite.
Cat's eye Page of 243 Olivine
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