THIN SECTION:	"U1301B-16R-1, 8-10 cm (Piece 2)"				TS #	29	Unit:5	"OBSERVER: MS, RC"
ROCK NAME: 	Moderately olivine-clinopyroxene-plagioclase phyric basalt							
WHERE SAMPLED:	Vein							
GRAIN SIZE:	Cryptocrystalline							
TEXTURE:	"Intersertal, glomeroporphyritic, pilotaxitic/hyalopilitic"							
PRIMARY	PERCENT 	PERCENT	SIZE (mm)			APPROX.		
MINERALOGY	PRESENT 	ORIGINAL	min.	max.	av.	COMP.	MORPHOLOGY	COMMENTS
PHENOCRYSTS								
Plagioclase	3	3	0.2	1.5	1.2		Euhedral to subhedral	Solitary crystals and as monomineralic and bimineralic glomeroporphyritic clots with clinopyroxene.
Clinopyroxene	3	3	0.2	0.5	0.3		Euhedral to anhedral	Present as glomeroporphyritic clots associated with plagioclase laths.
Olivine	0	1	0.2	1.8	1		Euhedral to subhedral	Completely replaced by saponite.

GROUNDMASS								
Plagioclase	20	20		<0.2			Euhedral	Microlaths.
Clinopyroxene	3	3		<0.2			Euhedral to anhedral	
Olivine	0	5		<0.2			Subhedral	
Mesostasis	63	67						

SECONDARY			SIZE (mm)					
MINERALOGY	PERCENT		min.	max.	av.		REPLACING / FILLING	COMMENTS
Saponite	4						"Olivine, mesostasis, vesicles"	Fibrous to granular brown-green saponite.
Feox + iddingsite	2						"Olivine, mesostasis, vesicles"	
Celadonite?	1							

VESICLES/			SIZE (mm)					
CAVITIES	PERCENT	 LOCATION	min.	max.	av.		FILLING / MORPHOLOGY	COMMENTS
Vesicles	3	Patchy	0.2	1.3	0.7			



COMMENTS : 	"Grain size decreases across the thin section towards the glassy chilled margin, groundmass plagioclase displays a hyalopilitic texture. Green and brown saponite present in the alteration halo."