Minerals identify

Know how to recognize them

Pickeringite

Sulfate mineral

Pickeringite is a magnesium sulfate mineral with formula MgAl2(SO4)4·22(H2O). It forms a series with halotrichite.

It forms as an alteration product of pyrite in aluminium rich rocks and in coal seams. It also occurs in pyrite rich hydrothermal ore deposits in arid regions. It forms in fumaroles and in caves, epsomite and gypsum

It was first described in 1844 for an occurrence in Cerros Pintados, Pampa del Tamarugal , Tarapacá Region. It was named for American linguist and philologist John Pickering (1777–1846).

Identification

Color of mineral

White
Yellow
Green
Red

Mohs scale ( mineral hardness )

1.5

Density ( specific gravity )

1.476
1.48
1.483

Luster ( interacts light )

Vitreous

Crystal ( diaphaneity )

Monoclinic