IGNEOUS 

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SHONKINITE through WELDED TUFF

SHONKINITE, IG-125. California.
Medium to coarse grained dark brown mica,
pink feldspar and pale green pyroxene.

SYENITE, IG-130. California.
Medium to coarse grained tan to reddish alkali
feldspar with up to 5% mafics.


NEPHELINE SYENITE, IG-130A. 
Canada. Medium to coarse grain nepheline with
5 - 1 0% pyroxene, biotite and minor plagioclase in
1- 5 mm grains.

HORNBLENDE SYENITE, IG-130B. 
Canada. Very coarse grain, about 50% reddish
to brown alkali feldspar.

SYENITE PORPHYRY, IG-130D. 
Nevada. Spectacular. With euhedral
orthoclase phenocrysts in aphanitic yellow-
brown alkali feldspar groundmass.

TONALITE, see under DIORITE

WELDED TUFF - IGNIMBRITE, IG-140 A, 
Nevada.  Fiamme obsidian through out a black and white groundmass 
of welded volcanic ash. Assorted accessory minerals visible include alkali feldspar and quartz. 

 

 

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