THIN SECTION:	"U1301B-18R-2, 92-94 cm (Piece 2d)"				TS #	31	Unit:6	"OBSERVER: MS, RC"
ROCK NAME: 	Sparsely olivine-plagioclase phyric basalt							
WHERE SAMPLED:	Massive lava							
GRAIN SIZE:	Microcrystalline to fine grained							
TEXTURE:	"Intersertal to intergranular, glomeroporphyritic"							
PRIMARY	PERCENT 	PERCENT	SIZE (mm)			APPROX.		
MINERALOGY	PRESENT 	ORIGINAL	min.	max.	av.	COMP.	MORPHOLOGY	COMMENTS
PHENOCRYSTS								
Plagioclase	3.7	3.7	1.2	2.7	1.5		Euhedral to skeletal	"Occurs singly, nomo- and bi-mineralic glomeroporphyritic clots with olivine + clinopyroxene."
Olivine	0	1.2	0.6	1.2	0.9		Subhedral to anhedral	Completely pseudomorphed  by brown saponite.


GROUNDMASS								
Plagioclase	32.9	32.9		<1			Euhedral to subhedral	Present as microlaths and needles.
Clinopyroxene	31	31		<0.5			Anhedral	Occurs singly or attached to intergrown with plagioclase.
Olivine	0	17.4		<0.7			Subhedral	
Mesostasis	1	1.7						

SECONDARY			SIZE (mm)					
MINERALOGY	PERCENT		min.	max.	av.		REPLACING / FILLING	COMMENTS
Saponite	15						"Olivine, mesostasis, vein, vesicles"	Brown in color in the vesicles/replacing olivine phenocrysts.
Carbonate	2							

VESICLES/			SIZE (mm)					
CAVITIES	PERCENT	 LOCATION	min.	max.	av.		FILLING / MORPHOLOGY	COMMENTS
Vesicles	10	Even	0.3	2.7	1.5		Saponite	



COMMENTS : 	"Vesicles generally lined with granular saponite (+/-) opaque minerals; some are filled with saponite /or empty, some filled with carbonate."