Austinite is a colorless to pale yellowish white or bright green mineral formed in the oxidation zone of arsenic-bearing ore deposits, where it is found developed on the colloform surface of limonite or lining small cavities. It is closely associated with adamite. Austinite is named in honour of Austin Flint Rogers, an American mineralogist
CaZn(AsO4)(OH); Hardness 4 - 4½; Orthorhombic
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
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.
Chemical composition: Cu2(CO3)(OH)2 ; Hardness: 3.5-4; monoclinic
Azurite is a soft, deep-blue copper carbonate produced by weathering of copper ore deposits. During the early 19th century, it was also known as chessylite. The mineral has been known since ancient times, and was mentioned in Pliny the Elder's Natural History.
Cu3(CO3)2(OH)2; Hardness 3½ - 4; Monoclinic