Uytenbogaardtite

It occurs as tiny crystals, visible only with a microscope.

It has a metallic luster and a hardness on the Mohs scale of 2 (gypsum).

The type locality is Tambang Sawah, Bengkulu district, Sumatra island, Indonesia.

Common impurities in the uytenbogaardtite are copper, selenium, and tellurium.

It is named after the Dutch mineralogist Willem Uytenbogaardt (1918–2012), Professor of Geology, Technical University, Delft, The Netherlands, prominent ore microscopist.