THIN SECTION:	"U1301B-18R-4, 82-83 cm (Piece 3)"				TS #	35	Unit:6	"OBSERVER: MS, RC"
ROCK NAME: 	Sparsely clinopyroxene-olivine-plagioclase phyric basalt							
WHERE SAMPLED:	Vein							
GRAIN SIZE:	Crypto to microcrystalline							
TEXTURE:	"Intersertal to intergranular, glomeroporphyritic"							
PRIMARY	PERCENT 	PERCENT	SIZE (mm)			APPROX.		
MINERALOGY	PRESENT 	ORIGINAL	min.	max.	av.	COMP.	MORPHOLOGY	COMMENTS
PHENOCRYSTS								
Plagioclase	3	3	0.3	1.7	1.2		Euhedral to subhedral	"Laths and skeletal crystals, and in mono- and poly-mineralic glomeroporphyritic clots."
Clinopyroxene	1	1	0.2	1.2	0.8		Euhedral to anhedral	"Occurs singly, but more frequently in glomeroporphyritic clots or associated with plagioclase laths."
Olivine	0	1	0.2	1.8	1		Euhedral to subhedral	Completely replaced by saponite.


GROUNDMASS								
Plagioclase	39	39		<0.3			Euhedral to subhedral	Laths and needles.
Clinopyroxene	23	23		<0.2			Euhedral to anhedral	Occurs singly or attached to/intergrown with plagioclase.
Olivine	0	15		<0.2			Euhedral to subhedral	Completely replaced by clay.
Opaque minerals	3	3						
Mesostasis	10	12						
SECONDARY			SIZE (mm)					
MINERALOGY	PERCENT		min.	max.	av.		REPLACING / FILLING	COMMENTS
Saponite	12						"Olivine, mesostasis, vesicles"	Brown to brown-gray color.
Celadonite	3						"vesicles, vein"	Present in the interior of vesicles and vein.
Feox+iddingsite	3						"vesicles, vein, mesostasis"	


VESICLES/			SIZE (mm)					
CAVITIES	PERCENT	 LOCATION	min.	max.	av.		FILLING / MORPHOLOGY	COMMENTS
Vesicles	2	Even	0.3	1.6	0.8		"Saponite, celadonite, Feox"	



COMMENTS : 	"Highly altered rock, hand specimen is pale green in color. There is a significant grain size change across the thin section."