OF CENTRAL CANADA PART II. 71 



ford, Stukely, Brompton, Acton, Melbourne, Cleveland, &c. Also 

 reported from Coteau St. Genevieve, near Quebec. 



15. Purple or Variegated Pyrites (Bornite, Erubescite, Horse-flesh 

 Ore) : Pale brownish-red, but always presenting a rich purple or 

 variegated tarnish ; streak, greyish-black. Regular, but rarely cry- 

 stallized ; mostly in irregular masses. Brittle. H = 3.0; sp.gr. 

 4.5 5.5. BB, fusible into a dark magnetic globule. Composition 

 somewhat variable, but averaging : Sulphur 25, Copper 60, Iron 15. 

 A sample from Lake Huron gave the author : Sulphur 24.03, Copper 

 63.19, Iron 11.86. 



This valuable mineral (the "horse-flesh ore" of miners) occurs in 

 large and small masses, imbedded in, or scattered through, many of 

 the altered strata of the Eastern Townships ; and also, though less 

 abundantly, in quartz veins traversing these strata. Some of the more 

 important localities comprise the celebrated Acton mine in Acton 

 Township, the Halifax mine in the township of the same name, Sweet's 

 mine in Sutton, Cold Spring mine and Balrath mine in Melbourne, 

 the St. Francis mine in Cleveland, and the Harvey Hill mine in Leeds ; 

 but it occurs also in other parts of these townships, as well as, more 

 or less', throughout the entire district, associated most commonly with 

 the ordinary or yelloy pyrites, and frequently with earthy malachite, 

 copper glance, native copper, galena, &c. The country rock is usually 

 a dolomitic limestone, or a chloritic or micaceous slate. See further, 

 under Copper Pyrites, below. 



In other parts of Canada, this ore occurs but sparingly. It has 

 been found at the Wellington and Bruce mines on Lake Huron j and 

 in veins at Point-aux-Mines, Maimanse, and elsewhere, on Lake Sup- 

 erior. Lake Huron specimens sometimes exhibit pseuodmorphs (tetra- 

 hedrons of the Tetragonal System after Copper Pyrites. 



16. Copper Pyrites (Chalkopyrite) /-Brass-yellow, often with varie- 

 gated tarnish ; streak, dark green, or greenish-black. Tetragonal in 

 crystallization, but commonly found in irregular masses. Brittle. 

 H = 3.5 4.0 ; sp. gr. 4.1 4.3. BB, melts into a dark magnetic 

 globule ; after roasting, yields, with carb. soda, metallic copper. One 

 hundred parts contain : Sulphur 34.9, Copper 34.6, Iron 30.5 



This is the common ore of copper. It is familiarly known as " yel- 

 low copper ore." It occurs in small quantities, both in veins and in 

 scattered masses, among the Laurentian strata of various localities : 



