Hemimorphite is a white, pale blue-green or gray hydrous zinc silicate usually found in the oxidized zones of zinc and lead deposits, and often associated with smithsonite, ZnCO3. They were assumed to be the same mineral and both were classed under the same name of calamine. Some specimens show strong green fluorescence in shortwave UV light and weak light pink fluorescence in longwave UV.
Zn4Si2O7(OH)2 · H2O; Hardness 4½ - 5; 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