250 



DESCKIPTIVE 



CATALOGUE 



509. Talcose slate — quartzose ; contains some mica and felspar; lamina?, rather 

 indistinct ; colour, grayish green ; fracture irregular. 



510. Talcose slate — very fine-grained ; compact ; thinly laminated ; colour, 

 grayish green ; suitable for Avhetstones. 



511. Quartz — colour, reddish brown ; crystalline; with yellow iron pyrites, crys- 

 tallized as well as foliated, disseminated through it. 



512. Micaceous quartzose schist — very fine-grained ; inclining to a fibrous texture. 



513. Fine-grained mica slate — thinly laminated. 



514. Same as No. 513 — traversed by veins of fine-grained granite. 



515. Fine-grained mica slate. 



516. Mica slate — coarse-grained; traversed by granite veins. 



517. Granite — fine-grained; passing into syenite; colour, grayish and greenish. 



518. Mica slate — colour, grayish black. 



519. Mica slate — shows an inclination to a more granular structure than No. 

 518 ; colour, gray, and brownish gray; the disposition of the scales of mica does not 

 affect the granular appearance of the mass, although mica is the predominant 

 mineral ; fracture, irregular ; incrustations '^of oxide of iron among the scales of 

 mica, and the fragments of felspar and quartz. 



520. Mica slate. 



521. Granite — fine-grained; colour, grayish white ; felspar predominates; the 

 quartz and mica being quite subordinate. 



523. A compound of felspar and quartz — coarsely granular; colour, yellowish 

 brown ; irregular fracture ; traversed by seams of quartz. 



524. Granite — passing into syenite ; flesh-coloured felspar predominates ; some- 

 times rich in mica ; in general, fine-grained ; colour, pale red, and gray. 



525. Coarse felspathic granite — the felspar flesh-coloured. 



526. Gneiss — the felspar, pale reddish in colour; black mica predominant; pass- 

 ing into 



527. Fine-grained mica slate, with minute crystalline grains of felspar. 



528. Mica slate — fine-grained. 



529. Mica slate — coarse-grained. 



530. Granite — rather felspathic ; colour, reddish, from the predominance of flesh- 

 coloured felspar. 



531. Porphyritic granite — the felspar base red, in which mica and crystals of 

 white felspar are embedded ; contains but little mica ; rather coarse-grained. 



532. Mica slate — very finely laminated ; colour, gray. 



533. Very coarse felspathic granite. 



534. Vein, containing very large crystals of flesh-coloured felspar, associated with 

 quartz. 



535. Fine-grained mica slate. 



536. Fine-grained mica slate, traversed by veins of felspar of a dirty white colour. 



537. Felspar, from a vein in No. 536 ; contains garnets, and some little black 

 mica. 



538. Graphic granite — containing nests of actinolite, and some tourmaline. The 

 actinolite is radiated, the crystals very fine, and of a white colour, playing into 



