Tannins are bitter compounds common in material from trees and bushes, but not grass.

In group 16 silicon dioxide is a very common compound that widely occurs as sand or quartz.

Cellulose is the most common organic compound and biopolymer on Earth.

Some of the more common color-producing compounds are tabulated here.

The most common cyclic compounds have five or six carbons in their ring.

This is important because cellulose is the most common organic compound on Earth.

The most common compound of chlorine, sodium chloride, has been known since ancient times.

So by far the most common compound in the condensing disc is water.

Calcium oxalate is a common compound found in many fungi, including the earthstars.