THIN SECTION:	"U1301B-7R-1, 32-34 cm (Piece 5b)"				TS #	15	Unit:1C	"OBSERVER: MS, RC"
ROCK NAME: 	Highly olivine-clinopyroxene-plagioclase phyric basalt							
WHERE SAMPLED:	Vein							
GRAIN SIZE:	Cryptocrystalline							
TEXTURE:	"Hyalo-ophitic, glomeroporphyritic, vesiclar"							
PRIMARY	PERCENT 	PERCENT	SIZE (mm)			APPROX.		
MINERALOGY	PRESENT 	ORIGINAL	min.	max.	av.	COMP.	MORPHOLOGY	COMMENTS
PHENOCRYSTS								
Plagioclase	5	5	0.3	1.5	1.2		Euhedral to subhedral	"Occurs singly, but is more common in monomineralic, bimineralic, and polymineralic glomeroporphyritic clots with pyroxene + olivine."
Clinopyroxene	2	2	0.2	0.5	0.3		Subhedral to anhedral	"Present singly, in glomeroporphyritic clots associated with plagioclase laths. One crystal shows twinning."
Olivine	0	2	0.3	1.5	0.8		Euhedral to subhedral	Completely replaced green saponite + celadonite.

GROUNDMASS								
Plagioclase	4	4		<0.3			Euhedral; lath	Microlaths and needles.
Clinopyroxene	2	2		<0.2			Euhedral to anhedral	
Olivine	0	1		<0.3			Subhedral	
Mesostasis	80	82						Includes opaque minerals.

SECONDARY			SIZE (mm)					
MINERALOGY	PERCENT		min.	max.	av.		REPLACING / FILLING	COMMENTS
Saponite	5						"Olivine, mesostasis, vesicles"	Granular green saponite.
Feox / hematite	2						"Olivine, mesostasis, vesicles"	
Celadonite	1						"Olivine, vesicles"	Occurs as pseudomorphs of olivine and filling the vesicles.
Iddingsite	Tr						Olivine	

VESICLES/			SIZE (mm)					
CAVITIES	PERCENT	 LOCATION	min.	max.	av.		FILLING / MORPHOLOGY	COMMENTS
Vesicles	2	Even	0.1	0.5	0.3		"Saponite, Feox, celadonite"	


COMMENTS : 	"0.5 mm vein, Feox and hematite along edges, saponite inside (middle missing), celadonite and Feox in halo adjacent to vein (8-mm halo)."