Either of two semiprecious gemstones: a violet-colored number of ruby spinel
(q.v.) or iron aluminum garnet, which is most considerable of the garnets.
Specimens of the garnet, continuously crystals, comprise up to 25 % grossular or
andradite and are commonly brownish purple; gem-quality stone is deep pink and
barely purple. Almandine, the so-known as precious garnet, is most often faceted
for rings. Cabochon-cut (rounded, convex polished surface), deep purple
almandine known as carbuncle; its base is commonly hollowed to lighten its
colour. When rutile needles are included within the almandine, the cabochons
often present a 4-rayed asterism (star-formed figure).
Almandine is normally discovered combined with each pyrope and spessartine. It
occurs in metamorphic rocks, the place its presence indicates the grade of
metamorphism.
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