quartz-porphyry

Where these sedimentary rocks have quartz-porphyry, or feldspar-porphyry, associated with them the conditions seem favorable for the deposition of gold.

Mineral Resources of Northern Ontario 1923

In the Jerome or Verde district of central Arizona, folded pre-Cambrian greenstones and sediments were invaded by masses of quartz-porphyry, and after further deformation, rendering many of the rocks schistose, were intruded by an augite-diorite.

The Economic Aspect of Geology 1915

Contact metamorphism along both the quartz-porphyry and the diorite contacts was practically lacking.

The Economic Aspect of Geology 1915

Secondary strata, presenting a much smaller number of monocotyledonous plants; (a) Co-ordinate and almost contemporary formations with red sandstone (rothe todtes liegende), quartz-porphyry and fern-coal.

Travels to the Equinoctial Regions of America 1851

The bed of the river furnished quite a collection of primitive rocks: there were pebbles of quartz, white, red, and grey; of granite; of sienite; of felspathic porphyry, hornblende, and quartz-porphyry; and of slate-rock.

Journal of an Overland Expedition in Australia : from Moreton Bay to Port Essington, a distance of upwards of 3000 miles, during the years 1844-1845 Ludwig Leichhardt 1830

Secondary strata, presenting a much smaller number of monocotyledonous plants; (a) Co-ordinate and almost contemporary formations with red sandstone (rothe todtes liegende), quartz-porphyry and fern-coal.

Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 3 Alexander von Humboldt 1814

Granite, gneiss, | | | | | quartz-porphyry, | | | | | fire-clay, &c.

A Text-book of Assaying: For the Use of Those Connected with Mines. Cornelius Beringer 1886