THIN SECTION:	"U1301B-19R-1, 132-134 cm (Piece 19)"				TS #	36	Unit:7A	"OBSERVER: RC, MS"
ROCK NAME: 	Moderately olivine-clinopyroxene-plagioclase phyric basalt							
WHERE SAMPLED:	Pillow interior (alteration halo)							
GRAIN SIZE:	Cryptocrystalline							
TEXTURE:	"Hyalo-ophytic to intersertal, glomeroporphyritic."							
PRIMARY	PERCENT 	PERCENT	SIZE (mm)			APPROX.		
MINERALOGY	PRESENT 	ORIGINAL	min.	max.	av.	COMP.	MORPHOLOGY	COMMENTS
PHENOCRYSTS								
Plagioclase	1.8	1.8	1.5	3.8	1.5		Euhedral to subhedral	"Occurs singly, but more commonly in monomineralic, bimineralic, and polymineralic glomeroporphyritic clots with pyroxene."
Clinopyroxene	5	5	1	2.5	1.3		Subhedral to anhedral	Normally in glomeroporphyritic clots or associated with plagioclase laths.
Olivine	0	1.6	0.8	1.5	0.6		Euhedral to subhedral	Completely replaced by green to brown saponite + Feox / iddingsite.

GROUNDMASS								
Plagioclase	29.2	29.2		<0.5			Euhedral	Laths and needles.
Clinopyroxene	10.7	10.7		<0.3			Subhedral to anhedral	Occurs singly or attached to/intergrown with plagioclase.
Olivine	0	3.8		<0.3			Euhedral to subhedral	Completely replaced by clay + Feox.
Mesostasis	26	51.6						

SECONDARY			SIZE (mm)					
MINERALOGY	PERCENT		min.	max.	av.		REPLACING / FILLING	COMMENTS
Saponite	5						"Olivine, mesostasis, vein"	Brown to green color in the vesicles and olivine phenocrysts.
Celadonite	2						Vesicles	
Hematite / Feox	5						Vesicles	

VESICLES/			SIZE (mm)					
CAVITIES	PERCENT	 LOCATION	min.	max.	av.		FILLING / MORPHOLOGY	COMMENTS
Vesicles	1.3	Even	0.1	1.9	0.6		"Saponite, Feox, celadonite"	

COMMENTS : 	"Two veins are recognized in the alteration halo, and consist of saponite, hematite / Feox and celadonite. The vein composition varies along its length, with zones of: hematite /Feox;  saponite+hematite /Feox; and hematite /Feox+celadonite fill."