292 THE TRAP MINERALS OF NOVA SCOTIA—GILPIN. 
The first group is represented by 
Phrenite. A hydrated silicate of alumina and lime holding 
iron, occurring as firm, hard encrusting masses usually mamil- 
lated ; among the localities yielding it may be mentioned Black 
Rock. 
The second group is represented by 
Apophillite. This mineral has been found at the same locali- 
ties as Laumontite, and also at Chute’s Cove, Swan’s Creek, and 
Blomidon. It is presented both massive and crystalline, with 
white, red and green colours, and associated with zeolites. It is 
named from its exfoliation before the blow-pipe flame, and is also 
called fish eye from its resemblance to the eye of a boiled fish. 
The following analysis of a Nova Scotia specimen is by 
Keakitt : 
Si 0 — Cad0 — K 0— Fe 0 — HO 
52:60 — 2488 — 514 — 171 — 1667 = 101-00 
The Zeolite section of the hydrous silicates however claims 
most attention. Dana divides them into eight groups, and re- 
marks that the resemblance to the Feldspar group in oxygen 
ratios seems at first thought to imply resemblance in the scheme _ 
of composition at least. But there is wide divergence of crys- 
talline form and physical character, while these points are 
grounds of unity in the Feldspar group. The water present has 
produced a wide divergence from the Feldspars, and it is there- 
fore probable that it is in part at least basic. 
They are composed essentially of silica and alumina with some 
alkali and more or less water, and generally gelatinise in acids. 
1. Mesotype group. 
Thomsonite. This occurs at Peters Point, and North moun- 
tain of Kings Co., in long and slender erystallisations of a gray- 
ish white colour, and as globular masses of radiated and inter- 
woven crystals. 
Mesole. This variety occurs in sperical concretions a few 
miles west of Blomidon. The following analyses are of Nava 
Scotia specimens : 
a e 
