THIN SECTION:	"U1301B-4R-2, 29-31 cm (Piece 6)"				TS #	7	Unit:1C	"OBSERVER: MS, RC"
ROCK NAME: 	Highly olivine-clinopyroxene-plagioclase phyric basalt							
WHERE SAMPLED:	Pillow interior							
GRAIN SIZE:	Cryptocrystalline							
TEXTURE:	"Hyalo-ophitic, glomeroporphyritic, vesicular"							
PRIMARY	PERCENT 	PERCENT	SIZE (mm)			APPROX.		
MINERALOGY	PRESENT 	ORIGINAL	min.	max.	av.	COMP.	MORPHOLOGY	COMMENTS
PHENOCRYSTS								
Plagioclase	12	12	0.3	2.2	15		Euhedral to skeletal	"Occurs singly, but is more common in monomineralic, bimineralic, and polymineralic glomeroporphyritic clots with pyroxene + olivine."
Clinopyroxene	1	1	0.4	0.6	0.5		Anhedral; round	Present as glomeroporphyritic clots associated with plagioclase laths.
Olivine	0	1	0.2	1.7	0.8		Euhedral to subhedral	Completely replaced by green or brown saponite + Feox / opaque mineral.

GROUNDMASS								
Plagioclase	5	5		<0.3			Euhedral	Laths and needles.
Clinopyroxene	1	Tr		<0.4			Euhedral to anhedral	Occurs singly or attached to/intergrown with plagioclase.
Olivine	0	Tr		<0.2			Subhedral	Completely replaced by saponite + celadonite + Feox.
Mesostasis	77	81						Including opaque minerals.

SECONDARY			SIZE (mm)					
MINERALOGY	PERCENT		min.	max.	av.		REPLACING / FILLING	COMMENTS
Saponite	5						"Olivine, mesostasis, vein, vesicles"	Brown to green color in the vesicles and olivine phenocrysts.
Celadonite	Tr						"Olivine, vesicles, vein"	Present in the vesicle cores
FeO(OH)	1						"Olivine, vesicles, vein"	
Oparue  (Py?)	Tr						Mesostasis	

VESICLES/			SIZE (mm)					
CAVITIES	PERCENT	 LOCATION	min.	max.	av.		FILLING / MORPHOLOGY	COMMENTS
Vesicles	1	Even	0.1	1	0.7		"Saponite, FeO(OH), celadonite"	"Filling mineral sequence variation: celadonite, Feox, saponite, and Feox, saponite."



COMMENTS : 	"Secondary mineralogy in the alteration halo is dominantly green saponite and celadonite, non-alteration halo contains a brown clay mineral (saponite?)."