250 DESCRIPTIVE CATALOGUE 
509. Talcose slate—quartzose ; contains some mica and felspar; lamine, rather 
indistinct ; colour, grayish green; fracture irregular. 
510. Talcose slate—very fine-grained; compact; thinly laminated; colour, 
grayish green; suitable for whetstones. 
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 bettuire. 
513. Fine-grained mica slate—thinly laminated. 
514, Saat as No. 515—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 
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 
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 
