In an effort to investigate the effect of acid stimulation on Greywacke core, a series of core plugs were extracted from core taken from an injection well hosted in Greywacke. These plugs were measured for porosity, density, seismic wave velocity, and permeability. ... Strength decreased in all samples treated with acid.

What does sandstone react with?

Sandstone, siltstone, and conglomerate sometimes have calcite cement that will produce a vigorous fizz with cold hydrochloric acid. Some conglomerates and breccias contain clasts of carbonate rocks or minerals that react with acid.

Does Coquina fizz in acid?

Calcite is the main component of limestone rocks and its varieties like oolitic limestone, fossiliferous limestone, coquina and marble. The calcite mineral is made of calcium carbonate which reacts with acid. Other varieties of calcium carbonate minerals such as aragonite and dolomite will also fizz during this test.