JOURNAL or GroLocy, VoL. XXIX, No. 3 Prate IV 
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i 
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4 
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A. Microcline microperthite (hypoperthite), called “‘Amazon- 
stone,’ Mineral Hill, Pennsylvania. Polarized light. X3o. 
Specimen 964. 
B. Microcline microperthite (hypoperthite), called ‘‘ Amazon- 
stone,” near Florissant, California. Polarized light. 30. 
Specimen 971. 
