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Encyclopedia Britannica - Main :: PYR-RAY |
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PYROPE (pronounced pirop) , a deep red variety of garnet, named from the Gr. 7rvpw7r6r (fiery) in allusion to its colour. It is used, like almandine (q.v.), as a gem-stone, but may be distinguished by the absence of any tinge of violet in its colour and by its lower specific gravity (3.7 or 3.8, while that of almandine is 4.1 to 4.3). The typical colour of pyrope
mineral
pyrope
aluminium garnet (see GARNET), but it usually contains more or less calcium , iron, manganese and chromium; and the rich
mineral
condition in the mineral has not been determined.Pyrope generally occurs in grains embedded in peridotites (olivine rocks) or in serpentine resulting from their alteration, or it is foundthe earliest known is that of Homberg, prepared by heating
aluminium sulphate and carbon) it promptly catches fire. Many readily oxidizable substances, especially when very finely divided, have the same property. Metallic iron and cobalt , when prepared under certain conditions, are pyrophoric, as is also ferrous oxide
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