206 



Ilniilaiidite. — This mineral, in small. opa(i[ue, white, oblique rhom- 

 bic prisms, invests the surfaces of a paroxenic rock on lot 7, range 1, of 

 Wakefield. 



We now come to the sulphates, of which we hav.^ bub one repre- 

 sentative, in the form of Barite, or sulphate of barytes. This mineral 

 is used extensively for the adulteration of white-lead, which, by afford- 

 ing a white powder when ground, together with its high specitio gravity 

 and cheapness, is often made to replace 75 pn- cent, of the lead, and 

 ^although the bulk may be increased, the body of the paint is impaired. 



A vein of this mineral, often veined with green fluor, was worked 

 ?ome years ago in the township of Hull. Another deposit of this min- 

 eral is on lot 12, range 12, of Templeton. It occurs in white lamellar 

 bedded masses in gneiss. The appearance or overlying portion is more 

 or less colored by the oxidation of some furruginous minei-al, and is 

 gi-eatly mixed with calcite. 



Carbonates. — Of this group, like the sulphates, we have but one 

 member in the form of limestone, or calcite, Independent of the ex- 

 tensive beds of amorphous and ciystalline limestone that so character- 

 ize this neighborhood, more especially the western portion, we find 

 bands of a more cleavable nature cutting through the pyroxenic strata, 

 forming the gangue of apatite and other minerals. 



On lot 7, range 1, of Wakefield, a beautiful dark-l)lue cleavable 

 variety is a.'isociated with wollastonite, and on the same property a 

 translucent, green, cleavable variety, often exhibiting large cleavage 

 ]ilanes, enclose garnet and pyroxene. Numerous other localities in 

 these townships have affoi'ded forms of the dog-tooth spar and other 

 ^combinations. 



Plourids. — Fluorite, or fluor-spar, m ly frequently be noticed 

 -amongst the associated minerals of the apatite veins. On lot 13, range 

 1.3, of Hull, small semi-transparent greenish cubes occur in a limestone, 

 and on lot 10, range 14, octahedrons of th3 same color have baen found. 

 It is also frequently met with in small quantities of a blue, violet or 

 purple color. 



Anhydrous Oxides. — Independent of those members of this 

 wroup already mentioned under iron ores, we have spinel and rutile to 

 notice. The former occur? in cubes, sometimes more than an inch 



