Jul 31, 2015
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Hutchinsonite is a rare sulphosalt mineral with the chemical formula (Ti,Pb)2As5S9. It is one of a few thallium minerals, all of which are rare. It is black or dark red/pink in colour and is subtranslucent to opaque with a submetallic lustre. Its crystals are acicular (needle-like) in habit or prismatic, resemblining tourmaline crystals. It has a hardness of 1.5-2 and a red streak.
Thallium is a soft, malleable metal with applications in electronics, pharmaceuticals, and glass manufacturing. It, along with arsenic, gained notority as a poison, and compounds of both elements were historically used as murder weapons, although arsenic is more well-known for this.
Sources:
Wikipedia (For thallium)
Webmineral
Image 1: 7mm hutchinsonite crystal on quartz from Quiruvilca Mine, Peru. Image by Didier Descouens, under a creative commons license on Wikimedia commons. Image 2 and 3: Hutchinsonite from the same locality as 1, from irocks.com. Sources here and here, respectively.