What is "geocronite"

Geocronite \Ge*oc"ro*nite\, n. [Gr. ge`a, gh^, the earth + Kro`nos Saturn, the alchemistic name of lead: cf. G. geokronit.] (Min.) A lead-gray or grayish blue mineral with a metallic luster, consisting of sulphur, antimony, and lead, with a small proportion of arsenic.

n. (context mineral English) A monoclinic-prismatic pure white mineral containing antimony, arsenic, lead, and sulfur.

Geocronite is a mineral, a mixed sulfosalt containing lead, antimony, and arsenic with a formula of Pb(Sb, As)S. Geocronite is the antimony rich endmember of a solid solution series. The arsenic rich endmember is named jordanite. It occurs as grey, black, to silvery white monoclinic crystals. It is found in hydrothermal veins usually associated with other similar minerals, particularly the sulfides of iron and copper.

The mineral has been found in Spain, Ireland and Sweden where it was first identified in 1839.