1893. ] NEW YORK ACADEMY OF SCIENCES. 97 
DISCUSSION. 
Professor A. H. Chester made the following remarks : 
Another mineral has recently been found at Franklin, which 
Prof. Kemp has not mentioned, though he knows of it. Itisa 
micaceous mineral, resulting from the alteration of biotite, and 
resembles clintonite very closely, so that it has had that name 
applied to ie As far as I can learn, it was first noticed by 
Prof. F. L. Nason in January, 1898. During the last summer 
he collected. a considerable amount of it, which is now under 
examination at the laboratory of the New Jersey Geological 
Survey at Rutgers College. At my request Prof. Nason has 
given me some account of its occurrence and association, which 
I will read, with your permission. 
“ The limestone formation of Orange County, New York, ex- 
tends southward into Sussex County, New Jersey, includes the 
zine deposits at Franklin Furnace and Stirling Hill, and as a con- 
binuous deposit terminates a little north of the village of Sparta. 
“At Franklin Furnace the white limestone is injected with 
numerous dikes of granite. These granites can be seen to good 
advantage in the furnace quarry at Franklin and in the Trotter 
Mine at the north end of Mine Hill. At the furnace quarry the 
eruptive origin of the granite is shown (a) by its thin tongues 
reaching out into the inclosing limestone from the main body ; 
(b) by its cutting across the strike of the limestone; and (c) by 
the large development of contact minerals, among the most 
prominent of which are tourmaline and chondrodite. 
“The granite here is peculiar in that the mineral allanite is so 
prominent that it may properly be called an allanite granite. 
“As might be expected, when this granite cuts the zinc vein, 
which it does, as proved by mining, interesting contact minerals 
are developed. On the surface the dike appears at a point 
known as Double Rock. Great masses of garnet here are found 
on the surface. In the limestone adjoining, the garnets appear 
abundantly in beautiful clusters of crystals. In the mine two 
hundred feet from the surface and from the surface down to this 
point the granite is encountered. In connection with this dike 
the rarer minerals found at Franklin occur. Allanite is found in 
large crystals usually in the coarse granite in contact with either 
the limestone or with the vein matter. 
“ Axinite, usually massive, but frequently in pockets, lined 
with small but brilliant crystals occurs. 
“ Large crystals of Amazon stone very perfect in form also 
occur. One large crystal formerly in the possession of Mr. W. 
W. Pierce weighed about twenty pounds. 
TRANSACTIONS N. Y. AcaD. Scr. VoL. XIII. Sig. 7, Jan. 3, 1894. 
