180 A POPULAR EXPOSITION OF THE 
copper ores. It is the characteristic ore of our Huronian rocks.* It 
occurs abundantly in these, at the Bruce and Wallace mines, Root 
River, Echo Lake, &c., on Lake Huron; and in the Michipicoten 
Islands, Lake Superior. It occurs likewise, but in comparatively 
small quantities in the Laurentian formation: as in the Seigniory of 
Lanoraie, Berthier County, C.E.; &c.; and it has also been found in 
the metamorphic district of the Eastern Townships; more especially 
in Upton, Drummond County, (where an argentiferous variety occurs,) 
aud in Acton, Bagot County. At the latter locality it is auriferous. 
Purple Copper Pyrites, (Erubescite) :—Colour pale brownish-red, 
but always more or less masked by a rich blue or variegated tarnish ; 
streak, greyish-black, by which (as well as by its colour, &c.,) this 
Species may be easily distinguished from the variegated specimens of 
copper pyrites or yellow copper ore. Chiefly in amorphous or small 
granular masses accompanying yellow copper pyrites in quartz. Some- 
times, as observed by the writer (Canadian Journal, New Series: vol. 
1, page 187) in pseudomorphs, or altered (Dimetric) tetrahedrons, 
after the yellow ore. H=4.0; sp. gr. 4.4-5.0. Fusible with sulphur 
fumes into a magnetic globule. One hundred parts contain (as a 
mean): sulphur 25, copper 60, iron 15. This mineral occurs with 
copper pyrites at most of the localities given in the description of that 
substance, above. It is found also in the townships of Inverness and 
Leeds, Megantic County, C.E. 
Sulphuret of Copper, or Oopper Glance :—Dark lead-grey often 
with blue or green tarnish; streak, black and slightly shining. Chiefly 
in amorphous masses, more rarely in small flat six-sided crystals 
(Trimetric.) H 2.5-3.0; sp. gr. 5.5-5.8. Fusible with bubbling, 
colouring the flame green, and leaving a copper globule surrounded in 
* The following Table shows (ina descending order) the positions of the rock-groups 
recognised in Canada. These groups, with their various subdivisions, &c., will be discussed 
in detail in one of the succeeding Parts of this series of papers, but the present Table may 
prove useful in the mean time. 
Modern or Post-Tertiary Deposits. 
The true Drift Formation. 
(Here a great oreak occurs in the geological scale as represented in Canada.) 
Carboniferous Formation (developed in part only in Gaspé.) 
Devonian Formation, 
Silurian Formation,* 
Huronian Formation, 
Laurentian Formation. 
* The great fossiliferous formation of Canada. Metamorphosed or rendered crystalline 
in part, in the so-called “metamorphic district ”’ of the Eastern Townships and surrounds 
ing region. 
