108 
TOPULAR SCIENCE REVIEW. 
which numbers correspond with the formula Hg Te. In the same mine, the 
Keystone Mine, where this mercury telluride occurs, two more new minerals 
have been discovered. One, which has been named magnolite, is found in 
bundles or tufts of white silky needles ; they appear to have the composition 
indicated by the formula Hg 2 Te 0 4 . The second, ferrotellurite , forms 
delicate tufts of minute prismatic crystals of a straw and lemon-yellow 
colour ; their composition is probably represented by the formula Fe Te 0 4 . 
Cassinite. — Genth, in his Report on the Mineralogy of Pennsylvania, 
states that while the minerals, lenilite and delawarite, which Lea regarded 
as varieties of orthoclase, are identical with orthoclase, cassinite, on the 
other hand, which Lea had also included in the same category, proves to be 
of interest from the fact of its containing 4 per cent, of baryta. The density 
of cassinite is 2*692, and the analytical results which Genth has published 
show the oxygen ratios for (R 2 0 + R 0) : R 2 0 3 : Si 0 2 to be 1:3: 10.7. 
His results are of interest when compared with those of Des Cloizeaux on 
baryta-felspar. — Zeitschrift fur Kry stall, und Miner oiLogie , 1877, 1298. 
Venerite , a New Copper Ore. — This ore occurs in the Jones Mine, near 
Springfield, Caernarvon Township, Berks County, Pennsylvania, a locality 
which has long been known for extensive deposits of magnetite, with more 
or less chalcopyrite, malachiite, and chrysocolla. In one part of the mine 
Sterry Hunt observed some layers of a green earth-like substance which, 
during the last few years, has yielded a considerable amount of copper. 
When dried it has a greenish white colour, and readily crumbles to a powder 
which, under the microscope, is seen to consist of thin transparent plates 
mixed with a few quartz grains and some magnetite. Analyses of a pure 
pecimen gave the following numbers 
Silicic acid 
. 30*73 
Alumina 
. 14*67 
Iron peroxide .... 
. 5*35 
Iron protoxide .... 
. 0*29 
Magnesia ..... 
. 18*55 
Copper oxide .... 
. 17*58 
Quartz 
. 12*83 
100*00 
The oxygen ratios of R O : R 2 0 3 : Si 0 2 : H 2 O are 3 : 4 : 6 : 4, from 
which it appears that the substance, if homogeneous, must be placed among 
the chlorites. — Zeitschrift fur Kry stall, und Mineralogie , 1877, 495. 
Silaonite. — Fernandez and Navia have given this name to a new selenide, 
which they have found associated with guanajuatite. It occurs massive, 
has a bluish grey colour, a hardness of 2f , and a density = 6*43 — 6*45. This 
new Mexican mineral appears to have the composition indicated by the 
formula Bi 3 Se. Selenium in small quantities has been found in association 
with tellurium in the joseite of Brazil. — Zeitschift fur Kry stall, und Miner a- 
logie, 1877, 499. 
Vietinghofite. — Damour has analysed a mineral found by De Lomonossow, 
on the shores of Lake Baikal. The new species is without crystalline form, 
has a dull black colour, a semi-metallic lustre, and a vitreous fracture. Its 
hardness is 5*5 — 6*0, and the specific gravity = 5*53. A fragment melts 
