THIN SECTION:	"U1301B-5R-1, 6-9 cm (Piece 2)"				TS #	9	Unit:1C	"OBSERVER: MS, RC"
ROCK NAME: 	Sparsely plagioclase phyric basalt							
WHERE SAMPLED:	Chilled contact							
GRAIN SIZE:	Cryptocrystalline							
TEXTURE:	"Glassy, spherulitic, hyalo-ophitic, glomeroporphyritic, pilotaxitic, vesicular"							
PRIMARY	PERCENT 	PERCENT	SIZE (mm)			APPROX.		
MINERALOGY	PRESENT 	ORIGINAL	min.	max.	av.	COMP.	MORPHOLOGY	COMMENTS
PHENOCRYSTS								
Plagioclase	3	3	0.3	3	1.8		Euhedral 	"Occurs singly, but is more common in monomineralic clots. Contains glass inclusions."



GROUNDMASS								
Plagioclase	4	4		<0.3			Euhedral	Laths and needles.
Clinopyroxene	1	1		<0.3			Euhedral to anhedral	
Olivine	0	2		<0.3			Euhedral	
Mesostasis	69	70						Sheaf-spherulitic texture. Opaque minerals.
Glass	18	20						"Fresh, transparent, pale brown. Contains rare spherulites, grades to the variolitic zone."
SECONDARY			SIZE (mm)					
MINERALOGY	PERCENT		min.	max.	av.		REPLACING / FILLING	COMMENTS
Saponite	2						"Olivine, mesostasis, vein, vesicles"	Fibrous/round in shape.
FeO(OH)	1						"Olivine, vesicles"	
Zeolite?	Tr						Vesicles	
Pyrite	Tr						Mesostasis and glass	

VESICLES/			SIZE (mm)					
CAVITIES	PERCENT	 LOCATION	min.	max.	av.		FILLING / MORPHOLOGY	COMMENTS
Vesicles	2	Even	0.1	1.2	0.6		"Saponite, Feox"	



COMMENTS :