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
Calcite forms in many different geologic environments. Usually colorless or white it can occur in many tints due to the inclusion of minor constituents during formation. It has possibly more habits of occurrence than any other mineral.
CaCO3 Hardness 3; trigonal
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
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