👉 Dawsonite is a mineral that is found in the Earth's crust and is composed of calcium carbonate. It has a gray to greenish color, a hardness of 6-7 on the Mohs scale of hardness, and a脆性。 Its chemical formula is CaCO3. Dawsnite is named after William Dawson, an American chemist who first described it in his book "The Chemistry of Minerals" published in 1850.