from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. felsite
from the GNU version of the Collaborative International Dictionary of English
- n. Felsite.
from The Century Dictionary and Cyclopedia
- n. A finely granular or cryptocrystalline admixture of quartz and orthoclase; felsite.
We travelled the whole morning across a plain composed chiefly of petrosilex.
The ground now became gravelly, covered with small black flints and petrosilex, a dark expanse of waste much resembling some parts of the desert of Tyh.
The floor was here of white petrosilex, there of grey granite, variegated with squares and lozenges, drops and pineapples, red, green, neutral tinted, and disposed by oxides of iron and copper in natural designs that looked artificial.
After thirty minutes 'walk up the southern plane of the prism, composed of gypseous and coralline rocks, veins of white petrosilex resembling broken columels, streaks of magnetic black sand, and scatters of grit and harder stones, we reached the summit of the little ridge.
At the end of an hour, the limestone terminated, and the road was covered with flints, petrosilex, and Egyptian pebbles; here are also found specimens of petrified wood, the largest about
We continued our route E. by S. over an uneven and somewhat hilly country covered with black petrosilex; and after a days march of eight hours and a quarter, we halted in a valley of little depth, called Wady
The plain upon which we encamped is sandy, covered with small pebbles and petrosilex.
_Chert or petrosilex_ stratified in cooling; their colour and their acid from sea-animals; labradore-stone from mother - pearl.
The latter three products arc likewise found in Alicuda, but Uic greater part of tiie lavas have the petrosilex for their base.
Its base is a clear red petrosilex, of an equal grain, smooth, and containing sm; iJl quadrangular scales of bril - liant fcltspars.
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