How to Perform the Geology Fizz Test without Hydrochloric Acid

Geologists love testing rocks and minerals and, admittedly, one of the most fun tests is the FIZZ TEST. The mineral calcite is made of calcium carbonate (CaCO3).

Hydrochloric acid is the most common acid used among geologists to test whether a rock has any calcite content. In this reaction, the calcium carbonate reacts with the acid and produces carbon dioxide gas, water, and calcium chloride. The carbon dioxide produces the bubbles that you see on the surface of the rock.

Ask-a-Geologist #14: What are the Properties of Calcite?

Sophia asked: what are the properties of calcite? I’m especially interested in its cleavage directions and fracture pattern.

Ask-a-Geologist #4: Why do geologists tests rocks for calcite?

Today we have another great geology question from one of our readers.

Terrance writes: Why do scientists check rocks to see if they contain calcite?