248 KEPOBT OF NATIONAL MUSEUM, 1899. 



on the Quebec Central Railway, in close proximity to the asbestos 

 mines. The ore here occurs in a series of pockets extending in an 

 east and west direction. Some of the pockets are found lying in a 

 dike of fine-grained granulite, but the possible relationship between 

 the two has not been made out. While other deposits occur not asso- 

 ciated with the granulite, it is to be noticed that the largest pockets 

 of high-grade ore are thus associated. From one such pocket on the 

 Lambly property over 500 tons of ore were taken, yielding 54 per 

 cent to 56 per cent sesquioxide of chromium. 



Aside from the localities above mentioned, chromic iron is found in 

 pocket masses in the Cambrian and serpentinous rocks lying between 

 the Vermont line and the Gaspe peninsula, but has never been success- 

 fully mined owing to the great uncertainty attending its occurrence. 



It is rarely found in beds or veins, but in detached pockets which yield from a 

 few pounds to hundreds of tons, the larger pockets being comparatively rare. 



Chrome ore is also found in Newfoundland; the Russian Urals 

 (Specimen No. 40322, U.S.N.M.); in Asia Minor (Specimen No. 40156, 

 U.S.N.M.) and European Turkey (Specimen No. 4674, U.S.N.M.) and 

 in Macedonia; in Australia (Specimens Nos. 62532, 60999, U.S.N.M.) 

 and New Zealand (Specimen No. 70346, U.S.N.M.). In all cases so far 

 as known the deposits occurring in peridotite or serpentine. 



The principal domestic sources of chromite are at present Del Norte 

 (Specimen No. 65349, U.S.N.M.); San Luis Obispo, Shasta (Specimen 

 No. 66498, U.S.N.M.), and Placer (Specimen No. 65351, U.S.N.M.) 

 counties in California, though formerly mines in Lancaster County, 

 Pennsylvania (Specimens Nos. 11681, 5179, U.S.N.M.), and at the Bare 

 Hills, near Baltimore, Maryland (Specimen No. 63032, U.S.N.M.) were 

 very productive. 



Uses. Chromium is used in the production of the pigments 

 chrome yellow, orange, and green, and in the manufacture of bichro- 

 mate of potash for calico printing, and which is also used in certain 

 forms of electric batteries. A small amount is also used in the pro- 

 duction of what is known as chrome steel. 



According to P. Speier, chrome ore linings for reverberatory 

 furnaces have been successfully adopted in French, German, and Rus- 

 sian steel works. The bottom and walls of the furnace are lined 

 with chrome ore in large blocks, united by a cement formed by two 

 parts of chrome ore finely ground, and one part of lime as free from 

 silica as possible. 



The introduction of chromium from the lining into the bath of 

 molten steel only takes place to a very limited extent. From 660 to 

 1,100 pounds of limestone is charged into the furnace, and, according 

 to the percentage of sulphur, from 220 to 440 pounds of manganese ore, 

 for a charge of 1.5 to 1.7 ton of pig iron and 1,100 to 1,300 pounds of 

 cast-iron scrap. About one-third, including steel scrap, is introduced 



