448 
DESCRIPTIVE MINERALOGY. 
4.70 to 4.80. Before the blowpipe, fuses on the edges. Composed of oxide of manganese 
75.80, silica 13.17, oxide of iron 4.14, alumina 2.80. 
At Lebanon in Pennsylvania. 
CALAMINE. 
Carbonate of Zinc. Cleaveland and Phillips. 
Colour greyish or .yellowish. Crystallized, compact and earthy. Primary an obtuse 
rhombohedron of 107° 40b Lustre between vitreous and pearly. Hardness 5.0. Sp. gr. 
4.20 to 4.50. Infusible before the blowpipe. Composed of oxide of zinc 64.80, carbonic 
acid 35.20. 
Brookfield, Connecticut; Franklin, New-Jersey; Perkiomen, Pennsylvania; and at the 
lead mines in Missouri. 
CHLOROPHiEITE. 
Chlorophabte. MacCuttoch and Cleaveland. 
Colour, when recently broken, from the transparent green of chrysolite, to the dull muddy 
green of steatite ; when exposed for a few hours, it turns darker, and at length becomes 
black. Occurs in nodules, often round, and varying in size. Soft. Brittle. Sp. gr. 2.02. 
Before the blowpipe, it remains unchanged. Composed principally of silica and iron, with a 
little alumina. 
This mineral, which occurs in Scotland and Iceland in amygdaloid, has also been found 
at Gill in Massachusetts, Southbury in Connecticut, and elsewhere in the United States. It 
is, however, still a doubtful species. 
CHLOROPHYLLITE.* 
Colour green. In tabular or short six-sided prisms arranged in folia or in columnar masses, 
resulting from the openness of natural joints. Cleaves into regular six-sided prisms with 
resplendent surfaces. Harder than apatite. Sp. gr. 2.70. Before the blowpipe, is glazed 
on the surface, but is not entirely fused. Composed of silica 45.20, phosphate of alumina 
27.60, magnesia 9.60, protoxide of iron 8,26, manganese 4.10, water 3.60, traces of 
potash and loss 1.64. 
Unity, New-IIampshire. 
C. T. Jackson. Report on the Geology of New-Hampshire, 1841. 
