Examples
“Our path, on setting out, lay along a narrow passage between rocks of granite, quartz, and feldspath; the direction north.”
“Near the opening of the mountain, where the water is found, at some distance below the highest summit, I found the rock to be porphyry of a light reddish colour, close grained, with small veins of feldspath, much resembling the porphyry I saw last year, in Wady Lamoule, beyond the Second”
“I saw only a few specimens of green porphyry, with red slabs of feldspath; the greatest part being red porphyry, and porphyry schist.”
“Sienite, and red feldspath, together with granite, compose this chain.”
“The rock on the southern side of the mountain is granite and feldspath; on the northern side, it is sand-stone.”
“The rocks where we rested, were of granite mixed with large masses of feldspath.”
“We rode over mountainous ground, where the sand-stone again appears among the grauwacke and feldspath, until, at two hours and a half from Kolbe, we reached Wady Dal (وادي دال), which may be called the southern extremity of the Batn el Hadjar.”
“The principal rock met with in passing this mountain is feldspath, and close to the river are granite, and granite schist.”
“On the east side are two shafts of reddish gray granite, in one piece, and one fine gray porphyry column with slabs of white feldspath.”
“The lowest range above Djidda is calcareous; but its rocks soon change into gneiss, and a species of granite, with schorl in the place of feldspath, accompanied by predominant masses of quartz, and some mica.”
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