328 Messrs. Jackson and Alger on the 
Species. 
Quartz. 
Siliceous Slate. 
Mica. 
Schorl. 
Felspar. 
Garnet. 
Stilbite. 
Laumonite 
Analcime 
Chabasie. 
Apophyllite. 
Heulandite. 
Thomsonite. 
Mesotype. 
Asbestus. 
Hornblende. 
SUBSPECIES. 
common crystallized 
Amethyst. 
ferruginous 
fetid 
Chalcedony, 
Siliceous Sinter. 
Heliotrope. 
Opal. 
Hornstone. 
Jasper. 
manganesian 
VARIETIES. 
limpid, smoky (Cairngorm). 
yellow, irised, radiated. 
red and purple 
brown and green. 
Cacholong. 
Carnelian, Onyx. 
Agate, — ribbon, brecciated, 
fortification, and moss. 
amethystine, and 
snow white. 
Semi-opal. 
common striped 
Agate-jasper. 
Ruin-jasper. 
Basanite. 
laminated. 
common black prismatic. 
acicular, in quartz. 
common. 
yellow and white. 
common, and red, or 
Sarcolite. 
cupreous green, a new variety. 
wine yellow. 
colorless. 
green and white. 
Albin. 
red and white. 
Mesolite or Needlestone. 
Skolezite. 
plumous and filamentous. 
fibrous. 
