THIN SECTION:	"U1301B-12R-1, 31-33 cm (Piece 3a)"				TS #	22	Unit:2A	"OBSERVER: RC, MS"
ROCK NAME: 	Moderately olivine-clinopyroxene-plagioclase phyric basalt							
WHERE SAMPLED:	Vein							
GRAIN SIZE:	Microcrystalline							
TEXTURE:	"Intersertal to intergranular, glomeroporphyritic."							
PRIMARY	PERCENT 	PERCENT	SIZE (mm)			APPROX.		
MINERALOGY	PRESENT 	ORIGINAL	min.	max.	av.	COMP.	MORPHOLOGY	COMMENTS
PHENOCRYSTS								
Plagioclase	3.1	3.1	1	2.5	1.2		Euhedral to skeletal	Occurs singly and as mono- and poly-mineralic glomeroporphyritic clots with olivine + clinopyroxene.
Clinopyroxene	1.2	1.2	1	2	0.4		Subhedral to anhedral	Present as glomeroporphyritic clots associated with plagioclase laths.
Olivine	0	3.6	0.5	1	0.6		Euhedral to subhedral	Completely pseudomorphed  by brown saponite.

GROUNDMASS								
Plagioclase	34.2	34.2		<1			Euhedral	Microlaths and needles.
Clinopyroxene	35.5	35.5		<1			Euhedral to anhedral	Occurs singly or attached to/intergrown with plagioclase.
Olivine	0	12.5		<0.5			Subhedral	
Mesostasis	4	5						
Opaque minerals	1.2	1.2						
SECONDARY			SIZE (mm)					
MINERALOGY	PERCENT		min.	max.	av.		REPLACING / FILLING	COMMENTS
Saponite	22						"Olivine, mesostasis, vein"	Brown color in the vesicles and olivine phenocrysts.
Pyrite	3						Vein	Present in the vesicle.

VESICLES/			SIZE (mm)					
CAVITIES	PERCENT	 LOCATION	min.	max.	av.		FILLING / MORPHOLOGY	COMMENTS
Vesicles	7.2	Even	0.3	1.3	0.7		Saponite	


COMMENTS : 	1 mm vein consists of pyrite and saponite.