78 
ST. HELENA. 
Selenite — Sulphate of lime or gypsum, foliated, fibrous, crys- 
talline, and stalactitic ; Bankses, Buperts, in veins on rocky 
outskirts. 
Augite crystals ; Manatee Bay, Lot, Turk’s Cap, &c. — s.g. 3 '08. 
Olivine. — Crystals. 
"Ditto, having undergone change to iron chrysolite. 
Calcite or calcspar in masses, fibrous and compact. — s.g. 2‘78. 
Turk’s Cap Valley. 
Yellow jasper, changes by the application of heat to a reddish- 
brown colour; Valley near Turk’s Cap. 
Quartz. — Various varieties of chalcedony and agate. 
Zeolite from cavities in basalt, in radiating acicular crystals, 
probably natrolite or skolecite. 
Boitroidal nodules of inferior brown haematite (iron ore) varying 
in size from half an inch to four inches in diameter, s.g. 
3T1. — Large quantities on the plains at Horse Pasture, 
Bock Cottage, Flagstaff and Deadwood. 
Silicate of iron (very impure iron ore) near Shipways. — s.g. 2‘92. 
Pyrolusite. — A very hard binoxide of manganese, containing 
66-47 per cent, of manganese, occurs in veins in beds of 
claystone at Holdfast Tom, Fisher’s Valley, Turk’s Cap, 
&c. The ore protrudes through the clay in scraggy scattered 
boitroidal forms. — s.g. 3 - 62, 4T8, 4'40. 
Carbonate of lime, zeolitic, in radiating boitroidal masses, mea- 
suring about eighteen inches across, containing embedded 
nodules of trachyte and carbonate of lime ; Prosperous Bav. 
Ditto, pure crystals; s.g. 2 77. — Prosperous Bay. 
Ditto, crystals and almond-shaped nodules from cavities in basalt ; 
s.g. 2'96, 3'02.— James’ Valley. 
Ditto, stalactitic and stalagmitic. 
Ditto, limestone. 
Ditto, dog-tooth spar ; face of Sandy Bay Barn. 
Serpentine. — Hear The Barn. 
Asbestos. — Fibrous white silicate of magnesia from Horse Point, 
near Turk’s Cap and Holdfast Tom. 
Bock salt. 
Argillaceous clay. — Many varieties. 
Bich vegetable soil, produced by disintegration offelspathic lavas. 
