Sienite and feldspar succeeded in our descent to the snow line, where we found a felspathic granite.
The hills behind consisted in the higher parts of a felspathic conglomerate and clay-slate dipping to the eastward.
When a fragmental rock is composed chiefly of rocks belonging to the acidic group, we say it is felspathic.
The rock was felspathic, apparently allied to those already seen in the Balonne.
Pebbles of felspathic porphyry were found in the river's bed.
Clay is formed from the disintegration of felspathic rocks, by the combined action of air and water.
In composition it is extremely different from basalt, this being a felspathic, as the other is an augitic, rock.
The cement of the sandstones is often felspathic; for this reason they yield useful porcelain clays in the Thuringerwald.