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in
the other. It practically always occurs in transparent fragments, each
fragment, however, being free from flaws and of a very uniform quality.
It is always derived from basic rocks. The specific gravity is 3"70 to
3'78; the hardness is 7-1/4. The refractive index for red light is 1-79, it never shows anomalous refraction, and it is very infusible.
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Fig. 26.—A Group of Garnet Crystals.
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The
colour depends on the presence of iron and manganese, and perhaps
chromium also. It is found in Bohemia in a decomposed basic rock and in
detritus from this near Meronitz, Podsedlitz, and Budweis; in Saxony,
at Zoblitz; in Scotland, at Elie in agglomerate ; and in South Africa
in the Diamond bearing agglomerates where both a paler red and
blood-red colours (Cape Ruby) occur, associated
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