feldspath

Sienite, and red feldspath, together with granite, compose this chain.

Travels in Nubia 2004

The rock on the southern side of the mountain is granite and feldspath; on the northern side, it is sand-stone.

Travels in Nubia 2004

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

Travels in Nubia 2004

The principal rock met with in passing this mountain is feldspath, and close to the river are granite, and granite schist.

Travels in Nubia 2004

The rocks where we rested, were of granite mixed with large masses of feldspath.

Travels in Nubia 2004

Our path, on setting out, lay along a narrow passage between rocks of granite, quartz, and feldspath; the direction north.

Travels in Nubia 2004

I saw only a few specimens of green porphyry, with red slabs of feldspath; the greatest part being red porphyry, and porphyry schist.

Travels in Nubia 2004

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.

Travels in Nubia 2004

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.

Travels in Arabia 2003

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.

Travels in Arabia 2003