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MICROSCOPIC STRUCTURE OF MINERALS AND ROCKs. 

1, Idiomorphic Olivine in longitudinal section, with transverse cracks and imperfect cleavage. 
Basalt. 
») 
Crystal of Olivine with incipient serpentinization along the cracks and borders. Basalt. 
3. Crystals of Chiastolite (Andalusite) with inclusions. Slate. 
4, Chiastolite in contorted Slate. 
[To fuce page 17. 
