Page:Transactions of the Geological Society, 1st series, vol. 2.djvu/492

482 from the transparent quartz grains with which it is intimately united in the fresh rock.
 * 1) The same rock in point of external aspect, but evidently formed of highly compacted and rounded grains of many different colours. from the same place.
 * 2) Brown quartz rock, of which the fracture is so little granular that it almost approaches to common quartz; semitransparent. From the mountains of Mar, Angus, and elsewhere, alternating with, micaceous schistus.
 * 3) The same rock, in the same situations, of various shades of red.
 * 4) An almost equal granular mixture of pure transparent quartz, and snow-white felspar, the grains amorphous. From Arisaig and Balahulish, with micaceous schistus.
 * 5) The same, but with fragments of felspar, hearing obscure marks of crystallization. From the latter place.
 * 6) Waxy and perfectly compact quartz, having a porphyritic aspect from imbedded fragments of felspar; accompanying the same rocks.
 * 7) White granular quartz rock of a moderately fine grain, containing at the same time large angular pieces of quartz, of a diameter from half an inch to many inches. In the same series at Balahulish.
 * 8) White granular rock consisting of felspar and quartz traversed by veins of pure white granular quartz, resembling in colour and texture the finest sugar. From Jura, and elsewhere.
 * 9) Distinctly rounded grains of the purest transparent quartz and imbedded in a mass of very fine grained white quartz. From the Cape of Good Hope.
 * 10) An uniform mixture of grains of transparent white quartz and opaque reddish felspar, containing rounded pebbles and fragments