Professor Emerson on HalVs Geological Collections. 567 



whicli clialcopyrite occurs disseminated. Tlie rock is tinged green with malachite 

 from its decomposition. 



French Head, Field Bay. 



90. Chalcopyrite. 



Several pieces exactly the same as 88. 

 Labeled, " Stones from Kuen-gum-mi-ooke." 



91. Chalcopyrite. 



Galena, siderite, pyrite. A weathered piece, containing amber-colored side- 

 rite, with the other minerals mentioned above. 

 French Head, Field Bay. 



92. Steatite. 



A greenish-white compact talc, pale slaty-blue externally, with much hair- 

 brown phlogopite. 



Labeled, "At the coal found up Little Bay ten miles from Ni-un-ti-lik." 



93. Corundum. 



A mass larger than a hen's egg of matted crystalline plates of a light pis- 

 tachio green margarite, externally weathered to pale straw color. This incloses 

 crystalline portions of a deep clear cobalt-blue sapphire, making about one-third 

 the mass. The sapphire is very brittle, easily cleavable, and shows imperfect 

 crystalline forms where it projects into cavities in the margarite. It is in places 

 separated from the margarite by a thin layer of white calcite. The margarite 

 melts under the blowpipe to a white botryoidal enamel. 



CALCAEEOUS EOCKS AND ASSOCIATED MINEEALS. 



94. Granular limestone. 



Thin j)ieces of a fine even-grained statuary marble, pure white and without 

 impurities. It was manifestly iuterstratified with a soft green hydrous mica 

 schist which still remains attached to one surface. With it were pieces of coarse 

 granular limestone containing grains of pale-green coccolite. 



French Head, Field Bay. 



95. Granular limestone with coccolite. 



A rock consisting of white calcite, pale green to bottle green and olive green; 

 coccolite in rounded grains, with fused surfaces; bronze-colored phlogopite, and 

 rarely grains of colophonite and spinel. The three constituents are present in 

 about equal quantity, have about the same average size (2-6 mm.), and are so 

 mixed as to form a massive granular rock which simulates granite perfectly. 



Frobisher Bay. / 



