IGNEOUS  

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ADAMELLITE through ANORTHOSITE

ADAMELLITE (QUARTZ MONZONITE), IG-5.
California. Medium to coarse grain, light
pink, minor biotite in 1-3 mm grains.  

ALASKITE, see under GRANITE.

ANDESITE PORPHYRY, IG-10. 
California. Phenocrysts of white plagioclase crystals, 5mm to 1 cm,
in compact gray or red groundmass.  Check.

AMYGDALOIDAL ANDESITE, IG-10C. Amygdules, usually lined with
analcite crystals in brown andesite matrix.  Check for p&a.

HORNBLENDE ANDESITE, IG-10D. 
Nevada. Porphyritic. Scattered black
vitreous hornblende phenocrysts to 1 cm
in light to dark gray or hematite rich red-gray groundmass.
 

AUGITE ANDESITE, IG-10H. 
Nevada. Porphyritic with 0.2-2 mm
phenocrysts of andesine and augite in light
reddish gray partially devitrified glass.  Cp20 - 


ANORTHOSITE, IG-15. Cost J. California.
Light gray to light lavender-gray andesine
feldspar with occasional minor hypersthene
or chlorite.  
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