196 



The first of these we shall notice is the fibi-o-taljuiar WoUastonite, 

 occurring on lot 7, range 1 of Wakefield, in smiill delicate pink crystals, 

 but which, however, soon fade on exposure. This mineral also occurs 

 in large, fibrous masses in a dark sky-blue calcifce at the same locality. 

 A similar mineral occurs on lot 14 of the same range, enclosing an 

 amber-colored garnet and jnisms of a brown or greenish idocrase. 



Pyroxene. — Tiiis mineral, either massive or crystallized, mxy bs 

 I'egarded as the most ommon associate of the ar)atite deposits. Now, 

 under this heading, we have a aumber of varieties, but until more 

 extended research shall have established their authenticity ib will be 

 better to retain the general name of pyroxene. The massive variety, 

 which is mostly of some shade of green or grey, comprises large areas 

 of lock masses, which may conform to the general deposition or cut it. 



No attempt can or will be made, with our limited space, to enu- 

 merate every physical character offered by this mineral. But we will 

 select such illustrations as may offer the widest points of difference. 



On lot 9, range 13, of Hull, crystals of a grayish or grass green 

 color, often doubly terminated, occur in a band of pink limestone, 

 making up one-half its volume. They vary in size from 1 oz. to many 

 pounds in weight. Good crystals are often found in the soil, that have 

 been libei-ated by solution. The largest and finest crystals of this 

 mineral ai-e found at Moore's Mines, in Wakelield. Their planes, how- 

 ever, are rough and dulled by an incipient decomposition, a defect more 

 than counterbalanced by their sharpness of angles. These crystals 

 frequently attain an enormous size, often enclosing portions of calcite, 

 phlogopite and apatite, and like the latter mineral are often found 

 bent, and sometimes broken and recemented. On the Tth lot of the 

 first range various modified forms of the four-sided prism occur in a 

 crystalline limestone, and by extended replacements of their basal edges 

 produce such forms as the octahedron with rhombic bases. Other 

 complicati )ns exist, such as the enlargement of one set of faces at the 

 expense of others, giving rise to very unsymmetrical shapes. Their 

 color is white and translucent, then- opacity depending on the advance- 

 ment of decomposition that so conspicuously in places mars their 

 exterior lustre. On this same lob a mineral is found, having the crys- 

 talographic form of pyroxene, exhibiting every hardness between G and 



