The whole of the upper part of the cone consists of grey highly acidic lava.
Quartz occurs as a primary and essential constituent of igneous rocks of acidic composition such as granite, quartz-porphyry and rhyolite, being embedded in these either as irregularly shaped masses or as porphyritic crystals.
Acidic peroxides combine with basic oxides to form "per" salts, and by loss of oxygen yield the acidic oxide typical of the element.
The doctor turned red at her acidic tone and glanced at his chart.
The term oxyloiyte is open to the obiection that some peaty waters are alkaline, id not acidic as the term implies.