rock-granite

Updated: May 1, 2025

Many other substances, which are so little soluble in water, that their solubility could not be otherwise detected of themselves, are made to appear soluble by means of siliceous matter; such is feld-spar, one of the component parts of rock-granite. Feld-spar is a compound of siliceous, argillaceous, and calcareous earth, intimately united together.

James Hutton - Theory of the Earth, Volume 1 (of 4)