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THE MAT BIX OF THE DIAMOND
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parallel to the brachypinacoid
bisectrix appearing in sections with the most marked cleavage,
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There are also secondary cleavages, and the usual irregular cracks so common in olivine.1
Olivine
has not been detected in the ground mass of this rock. It is usually in
the form of crystals, more or less rounded and corroded, and even when
completely changed to serpentine, the original crystalline form can
generally be recognised.
Corrosion cavities (the ' einbuchtungen' of the Germans) are sometimes seen in the olivines.
The following are some of these :
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