quartz-rock

Some poor miner usually finds a ledge of quartz-rock and digs down the way the ledge goes.

Stories of California Ella M. Sexton

The other main line, namely, that of the Portillo, is of a totally different formation: it consists chiefly of grand bare pinnacles of a red potash-granite, which low down on the western flank are covered by a sandstone, converted by the former heat into a quartz-rock.

Chapter XV 1909

Where it occurs in veins of quartz-rock (the usual matrix), these veins are generally irregular in their thickness, often coming abruptly to an end as one follows them downward, and still more irregular and uncertain in the percentage of gold to rock.

Impressions of South Africa James Bryce Bryce 1880

More generally the surface is covered with coarse sand -- the _debris_ of granite or quartz-rock -- upon which no vegetable, save the lichen or the moss, can find life and nourishment.

Popular Adventure Tales Mayne Reid 1850

More generally the surface is covered with coarse sand -- the _debris_ of granite or quartz-rock -- upon which no vegetable, save the lichen or the moss, can find life and nourishment.

The Young Voyageurs Boy Hunters in the North Mayne Reid 1850

So much for the western line; in the Portillo pass, proceeding eastward, we meet an immense mass of conglomerate, dipping to the west 45 deg, which rest on micaceous sandstone, etc., etc., upheaved and converted into quartz-rock penetrated by dykes from the very grand mass of protogine (large crystals of quartz, red feldspar, and occasional little chlorite).

More Letters of Charles Darwin — Volume 1 Charles Darwin 1845

While sitting down, in his dilemma, on a quartz-rock, he observed something glittering beside him, and breaking off with his tomahawk a piece of the stone, he carried it home with him as a curiosity.

Chambers's Edinburgh Journal, No. 430 Volume 17, New Series, March 27, 1852 Various 1836

In seeking a favourable line of descent for the carts, I climbed a still higher forest-hill on the left, which consisted chiefly of quartz-rock.

Three Expeditions into the Interior of Eastern Australia, Volume 2 Thomas Mitchell 1823

a red potash-granite, which low down on the western flank are covered by a sandstone, converted by the former heat into a quartz-rock.

The Voyage of the Beagle Charles Darwin 1845

a district of grauwacke, now over a re-formation of the Lias; anon he finds himself on a primary limestone, -- gneiss, syenite, clay-slate, or quartz-rock; and yet anon amid the fossils of some outlier of the Old

The Cruise of the Betsey or, A Summer Ramble Among the Fossiliferous Deposits of the Hebrides. With Rambles of a Geologist or, Ten Thousand Miles Over the Fossiliferous Deposits of Scotland Hugh Miller 1829