THIN SECTION:	"U1301B-15R-1, 81-82 cm (Piece 11)"				TS #	27	Unit:4B	"OBSERVER: MS, RC"
ROCK NAME: 	Moderately olivine-clinopyroxene-plagioclase phyric basalt							
WHERE SAMPLED:	Vein							
GRAIN SIZE:	Microcrystalline							
TEXTURE:	"Intersertal to intergranular, glomeroporphyritic, vesicular"							
PRIMARY	PERCENT 	PERCENT	SIZE (mm)			APPROX.		
MINERALOGY	PRESENT 	ORIGINAL	min.	max.	av.	COMP.	MORPHOLOGY	COMMENTS
PHENOCRYSTS								
Plagioclase	5	5	0.7	2.8	1.6		Euhedral to skeletal	Occurs as single crystals (stubby laths).
Clinopyroxene	5	5	0.5	0.8	1.4		Euhedral to anhedral	Present as glomeroporphyritic clots associated with plagioclase laths.
Olivine	0	1	0	0.8	0.5		Euhedral	Completely replaced by brown saponite and Feox.

GROUNDMASS								
Plagioclase	42	42		<0.7			Euhedral	Laths and needles.
Clinopyroxene	24	24		<0.5			Anhedral	
Olivine	0	2		<0.3			Euhedral to subhedral	
Opaque	Tr	Tr					Round	In mesostasis.
Mesostasis	15	21						Including opaque minerals.
SECONDARY			SIZE (mm)					
MINERALOGY	PERCENT		min.	max.	av.		REPLACING / FILLING	COMMENTS
Saponite	5						"Olivine, mesostasis, vesicles"	"Fibrous/round, brown to green saponite.."
Celadonite	1						Vesicles	
FeO(OH) / hematite	3						"Vesicles, mesostasis, vein"	

VESICLES/			SIZE (mm)					
CAVITIES	PERCENT	 LOCATION	min.	max.	av.		FILLING / MORPHOLOGY	COMMENTS
Vesicles	5	Even	0.2	2	0.7		"Saponite, Feox / hematite, celadonite"	

COMMENTS : 	"1.5-2.0 mm, irregular Feox + green clay vein with 12 mm halo (Saponite + Celadonite)."