Malachite is a common copper mineral with a wide occurrence and brilliant green color. It is often banded in appearance and is usually found as crusts or crystal clusters. Can be found as a pseudomorph after azurite crystals.
Cu2(CO3)(OH)2; Hardness: 3.5-4; monoclinic
Rosasite is a zinc-copper carbonate hydroxide, occurring in the secondary oxidation zone of copper-zinc deposits. The color is blue-green, and the habit is fibrous. It is named after its type locality, the Rosas mind in Sardinia, Italy.
(Cu,Zn)2(CO3)(OH)2; Hardness 4½; Monoclinic
Goethite is the yellow- or reddish-brown alpha polymorph of iron(III) oxide-hydroxide, typically occurring in low-temperature environments. Goethite has been well known since ancient times for its use as the pigment brown ochre. The mineral was named after the Johann Wolfgang von Goethe
α-Fe3+O(OH); Hardness 5 - 5½; Orthorhombic
Barite the primary ore of barium, is a high-density barium sulfate with a wide range of industrial uses. It occurs mainly as clusters of tabular crystals or white bladed masses, also in yellow, brown, grey and blue. Barite has a high specific gravity that causes it to be very heavy for a non-metallic mineral. Due to its high-density barite can block gamma-rays and x-rays.
BaSO4; Hardness 3; Orthorhombic
