4:96 



Hewett and Shannon — Orientite, a 



neiv 



Santa Rosa prospect near Banes. Thin sections of 

 material from the Vicente claim show irre^'ular areas of 



Fig. 3, — Black, manganese oxide; dark gray (o), orientite; light gray 

 (p), plagioelase crystals; white fs), open space. X 25 diameters. 



The alignment of the fresh plagioelase laths in the grains of orientite 

 indicates flow structure in original glass, now re])laeed by orientite. 



Open cut No. 8, Costa Claim, 6 miles south of BueycitO; Oriente, Cuba. 



a clear light brown amorphous mineral in which there are 

 minute rosettes of orientite crystals. It was first thought 

 that the amorphous mineral was a variety of orientite, but 



Fig. 4. — Black, manganese oxide; gray (o), orientite pseudomorphs of 

 f oraminif era ; white (s), o^ew space. X ^-^ diameters. 



Foraminifera (calcite) replaced by orientite; remainder of rock largely 

 replaced by manganese oxide. 



Open cut No. 8, Costa Claim, 6 miles south of Bueycito, Oriente, Cuba. 



