MINERAL RESOURCES OF THE STATE OF NEW YORK 1 5/ 



purpose. The iron ore pigments have good covering power and are 

 resistant to atmospheric influences; they are largely used for outside 

 work in coating wood and iron structures and metal roofs. 



The principal material for metallic paint that occurs in the State 

 is the Clinton hematite, which is mined quite extensively for iron 

 ore. There are two kinds of the ore — the oolitic variety that occurs 

 in the section about Clinton, Oneida county, and the fossil ore 

 from the western part of the belt in Wayne county. The former 

 has a silica base, the latter a carbonate one, and the ground product 

 of each has a somewhat different color and quality. The manu- 

 facturing operations consist of roasting to get rid of the moisture 

 and volatile matter and grinding to fine powder. The product is 

 mostly sold in dry state. 



The red hematite from the St Lawrence-Jefferson county district 

 has been employed for metallic paint to a small extent. This ore 

 differs from the Clinton hematite in its structure, being finely divided 

 and without oolitic or fossil characters. Much of it is too hard 

 for paint, but some deposits yield soft material which can be ground 

 successfully. The paint stock has been produced mainly at Rossie, 

 St Lawrence county. 



No metallic paint is being made at present from limonite or 

 carbonate ores, although these occur in quantity in southeastern 

 New York. Limonite gives a brownish yellow color; the carbonate 

 a red which is brought out by calcination and differs somewhat 

 from the red of natural hematite. 



Mortar colors are prepared from the same materials as metallic 

 paint. They are used in tinting mortar, concrete and artificial 

 stone. 



Some kinds of slate and shale possess decided colors by reason 

 of the iron oxides they contain, as well as suitable textures for 

 grinding into paints. Such slate pigments, as they are known in 

 the trade, have a weaker coloring capacity than the ground ores, 

 although they may contain enough iron to give a close resemblance 

 to metallic paints. They yield a somewhat wider variety of tints, 

 being found in purple, bluish gray, red, brown and even black 

 colors, the last being the result of admixed carbonaceous matter. 

 They have an argillaceous base like ocher, but contain less water 

 and are more compact. 



The principal material used for slate pigment is the Cambrian 

 red slate of Washington county, well known as a roofing slate and 

 possessing a durable deep-red color. There are quarries of it in 

 Granville and Hebron townships. The waste material from the 



