The rock here is a porphyritic granite (porhyritic meaning that the stone has large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic matrix or groundmass). ❋ Greygirlbeast (2010)
This nature reserve occupies the Scandola peninsula, an impressive porphyritic rock mass. ❋ Unknown (2008)
On the other side we pass over masses of porphyritic trap, in contact with the same mica schists, and these probably give to the soil the great fertility we observed. ❋ Unknown (2004)
Sinai, grey granite dyked with decaying porphyritic trap, and everywhere veined with white and various-coloured quartzes. ❋ Unknown (2003)
A cut road runs to the top of the granite tongue, which faces the westernmost or down-stream outbreaks of the huge porphyritic masses on the other side of the ❋ Unknown (2003)
The fork is of heavy greenish porphyritic trap, also probably titaniferous iron, with a trace of silver,22 where it meets the quartz and the granite. ❋ Unknown (2003)
At a re-entering angle of the junction, a shallow pit was sunk; the sand became moist and red, and presently it was underlaid by a rubble of porphyritic trap. ❋ Unknown (2003)
Where the sandy slopes of South – Eastern Sinai-land end, appears a large white blot, apparently supporting a block, built, like a bastion, upon a tall hill of porphyritic trap. ❋ Unknown (2003)
Looking in that direction over the gloomy-metalled porphyritic slopes upon which we stand, the glance extends to a manner of sea-horizon; while the several planes below it are dotted with hills and hill-ranges, white, red, and black, all dwarfed by distance to the size of thimbles and pincushions. ❋ Unknown (2003)
We then turned eastwards or inland, ascended a Nakb (“gorge”), and saw, as before, the corallines and carbonates of lime altered, fused, scorified, and blackened by heated injections; the grey granite scored with quartz veins, running in all rhumbs; and the porphyritic trap forming crests that projected from the sands. ❋ Unknown (2003)
They appear to be a body of sand; but, as usual on this coast, the superficial sheet, the skin, hardly covers the syenite and porphyritic trap that form the charpente. ❋ Unknown (2003)
To the north the Wady Sawádah divides the granitic Harb from the porphyritic Jebel Sawádah; while the southern Wady Aylán separates the Dibbagh from the Jebel Aylán, a tall form distinctly visible from the Upper Shárr. ❋ Unknown (2003)
Tabúk. 151 During the evening we walked up the Wady Surr, finding, in its precipitous walls, immense veins of serpentine and porphyritic greenstone, but not ❋ Unknown (2003)
From the offing, also, we note how the later formations, granite and syenite, seamed with a network, and often topped by cones, of porphyritic trap, have upthrust, pierced, and isolated the older ❋ Unknown (2003)
On the left bank a porphyritic block, up whose side a mule can be ridden, is disposed in a slope of the palest and most languid of greens, broken by piles of black rock so regular as to appear artificial. ❋ Unknown (2003)
The neptunian quartz, again, has everywhere been cut by plutonic injections of porphyritic trap, veins averaging perhaps two metres, with a north-south strike, and a dip of 75 degrees (mag.) west. ❋ Unknown (2003)
We were perplexed by the shallow conical pits in the porphyritic trap, to the east and west of the ❋ Unknown (2003)
It ignores the porphyritic sub-range in which the “Mother of the Villages” lies: and it brings close to the east of it the tall peaks of the ❋ Unknown (2003)
The granites which before pierced the porphyritic traps in all directions, now appear only at intervals; and this, I am told, is the case throughout the northern, as we found it to be in the southern, prolongation of the ❋ Unknown (2003)
