POBPHYRITIC BASALT r, 6 'a t> ( 
Chief rock type. Dark gray or greenish gr ay^ in 
color, aphanitic, porphyritic, and frequently vesicular. 
The vesicles are occasionally filled with a zeolite, 
sometimes with secondary quartz. Th-e- reok at - ftssi T ru 
-nati ve -cracks v ■ ffiil sr-f g~" a 
eeeendfrry— depo s ft. 
The matrix is usually made up of thin blades of 
feldspar (labrador ite) and small rods of augite. Often 
the grcundmass is a palagonitized glass, yellowjto 6 *^ * 
greenish in color. Other minerals are olivine (usually 
altered wholly or partly to ' iddingsi te) , pragnetite, 
chlorite, ^Xc.j^^netA. * /mm ) 
The phenocrysts are usually feldspa^ and augite, 
occasionally olivine* 
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