syenitic

Here, for the first time, we saw hills with bare, smooth, rocky tops, and we crossed over broad dikes of gneiss and syenitic porphyry: the directions in which they lay were N. and S.

Missionary Travels and Researches in South Africa 2004

In the latter gorge, as already mentioned, igneous and syenitic masses have been acted on by some great fiery convulsion of nature; the strata are thrown into a huddled heap of confusion.

A Popular Account of Dr. Livingstone's Expedition to the Zambesi and Its Tributaries 2004

In two hours we crossed a small stream, with slippery syenitic rocks in its bed, showing the action of furious torrents.

How I Found Livingstone Henry Morton 2004

It is situated among rocks of syenitic porphyry in broad dikes, and gneiss tilted on edge, and having a strike to the N.E. There are many specimens of half-formed pumice, with greenstone and lava.

Missionary Travels and Researches in South Africa 2004

After marching about six miles, we entered a gorge called Umm el-Bíbán, “the Mother of Gates,” formed by the stony spurs of the Wady bank: the number of birds and trees, especially in the syenitic valleys, showed that water could not be far off.

The Land of Midian 2003

The valley-sole is parti-coloured; the sands of the deeper line to the right are tinctured a pale and sickly green by the degradation of the porphyritic traps, here towering in the largest masses yet seen; while the gravel of the left bank is warm, and lively with red grit and syenitic granite.

The Land of Midian 2003

Humboldt. 8 At the cataracts of the great rivers Orinoco, Nile, and Congo, the syenitic rocks are coated by a black substance, appearing as if they had been polished with plumbago.

Journal of researches into the geology and natural history of the various countries visited by H.M.S. Beagle 2003

Humboldt. 8 At the cataracts of the great rivers Orinoco, Nile, and Congo, the syenitic rocks are coated by a black substance, appearing as if they had been polished with plumbago.

Journal of researches into the geology and natural history of the various countries visited by H.M.S. Beagle 2003

The dust is richest, as usual, at the walls where the vein is in immediate contact with the heat-altered granites, whose red variety, containing very little mica, becomes quasi-syenitic.

The Land of Midian 2003

Here they are of three kinds: coarse and rough basaltic lava for the first and rudest work; red granite and syenitic granite for the next stage; and, lastly, an admirable handmill of the compactest grey granite, smooth as glass and hard as iron.

The Land of Midian 2003