porphyries

The Serra do Mar Mountain Chain is made up of ore-Cambrian granite porphyries and gneiss magma.

Southeast Atlantic Forest Reserves, Brazil

Slates, chalkstones, limestones, granites and porphyries form these mountains.

Alai-Western Tian Shan steppe

The lower beds of the Peuquenes ridge, and of the several great lines to the westward of it, are composed of a vast pile, many thousand feet in thickness, of porphyries which have flowed as submarine lavas, alternating with angular and rounded fragments of the same rocks, thrown out of the submarine craters.

Journal of researches into the geology and natural history of the various countries visited by H.M.S. Beagle

The normal dark-green traps and burnished red porphyries and grits were sparsely clad with the Shauhat and the Yasár trees, resembling the

The Land of Midian

The lower beds of the Peuquenes ridge, and of the several great lines to the westward of it, are composed of a vast pile, many thousand feet in thickness, of porphyries which have flowed as submarine lavas, alternating with angular and rounded fragments of the same rocks, thrown out of the submarine craters.

Journal of researches into the geology and natural history of the various countries visited by H.M.S. Beagle

That to the south showed us a perfectly familiar formation; conglomerates of water-rolled pebbles in the lower levels, and hills of the normal dark porphyries, with large quartz-seams of many colours trending in every direction.

The Land of Midian

To this period belong the felspar, syenites, and porphyries.

Journey to the Interior of the Earth

They attract attention only by their material, red boulders being used instead of the green porphyries of the hills; and the now desolate spot shows no signs of water or of palm-groves.

The Land of Midian

They consist of talcose-schiste, bluish-grey limestone, talc in beds, serpentine, black marble similar to the oldest in the Alps, quartz, feldspar, and porphyries.

Rambles in the Islands of Corsica and Sardinia with Notices of their History, Antiquities, and Present Condition.

These porphyries are pierced by greenstone two or three feet thick, and the granites are intersected by numerous veins of amphibolite

Rambles in the Islands of Corsica and Sardinia with Notices of their History, Antiquities, and Present Condition.