THIN SECTION:	"U1301B-24R-1, 4-6 cm (Piece 2)"				TS #	41	Unit:7B	"OBSERVER: MS, RC"
ROCK NAME: 	Highly-olivine-clinopyroxene-plagioclase phyric basalt							
WHERE SAMPLED:	Chilled margin							
GRAIN SIZE:	Cryptocrystalline							
TEXTURE:	"Glassy, hyalo-ophitic, spherulitic, glomeroporphyritic"							
PRIMARY	PERCENT 	PERCENT	SIZE (mm)			APPROX.		
MINERALOGY	PRESENT 	ORIGINAL	min.	max.	av.	COMP.	MORPHOLOGY	COMMENTS
PHENOCRYSTS								
Plagioclase	7	7	0.2	4.4	1.2		Euhedral to subhedral	Single laths isolated in mesostasis and associated with small agglomerates of granular pyroxene; present as glomerocrysts.
Clinopyroxene	2	2	0.2	0.6	0.4		Euhedral to anhedral	"Present singly, in glomeroporphyritic clots associated with plagioclase lath."
Olivine	0	1	0.2	0.6	0.4		Euhedral to subhedral	Fresh olivine present in  fresh glass. Completely replaced by brown saponite except for fresh glass part.

GROUNDMASS								
Plagioclase	5	5		<0.2			Euhedral	Microlaths.
Clinopyroxene	4	4		<0.2			Euhedral to anhedral	
Olivine	0	3		<0.2			Subhedral	
Mesostasis	68	69						
Glass	11	12						
SECONDARY			SIZE (mm)					
MINERALOGY	PERCENT		min.	max.	av.		REPLACING / FILLING	COMMENTS
Saponite	7						"Olivine, vesicles, vein"	Fibrous to granular brown-green saponite.
Pyrite	Tr						Glass	
Zeorite?	Tr						Vein	Present in veins within glass part.

VESICLES/			SIZE (mm)					
CAVITIES	PERCENT	 LOCATION	min.	max.	av.		FILLING / MORPHOLOGY	COMMENTS
Vesicles	2	Even	0.2	1.3	0.8		Saponite	



COMMENTS : 	Veins associated with radial (cooling) cracks are filled with saponite.