Formula: NiS

Species:

Colour: Pale brass-yellow, with an iridescent tarnish, and greenish-grey.

Lustre: Metallic

Hardness: 3 – 3½

Specific Gravity: 5.3 – 5.5

Crystal System: Trigonal

Name: Named by Wilhelm Haidinger in 1845 in honor of William Hallowes Miller (1801–1880), professor at the University of Cambridge, who first studied the crystals. He wrote ‘A Treatise on Crystallography’. Miller indices are also named after him.

Type Locality: Jáchymov, Karlovy Vary District, Karlovy Vary Region – Czech Republic

Dimorph of: Crowningshieldite

Commonly found as radiating and jackstraw clusters of shiny metallic acicular crystals, pale brass-yellow with an iridescent tarnish.