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Ch. 12: Beryl - Garnet

Ch. 12: Beryl - Garnet Page of 311 Ch. 12: Beryl - Garnet Text size:minus plus Restore normal size   Mail page  Print this page
PRECIOUS STONES.                               231
proverbial. The crystals as a rule show a prominent hexagonal prism, with the dihedral angles modified by a narrower face belonging to another prism (Fig. 19). Terminated crystals are rather the exception, but when they do occur the form of the termination is often very complex. More often the prism is limited by an eroded
surface (Fig. 20) (cf. Tourmaline). Another not uncommon feature is the transverse separation along the cleavage planes, with displacement of the fragments and subsequent cementation by Quartz. Attached crystals are often found in druses in certain granites ; most of the clear terminated crystals are so found. Another common mode of occurrence
Ch. 12: Beryl - Garnet Page of 311 Ch. 12: Beryl - Garnet
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