Yukonite Locality: Venus Mine, Windy Arm, Tagish Lake, Carcross, Whitehorse Mining District, Yukon Territory, Canada Size: 2.1 cm x 1.7 cm x 1 cm Yukonite is a rare hydrated arsenate of calcium and iron and this showy and rich thumbnail is from near the Type Locality in the Yukon. Lustrous, reddish-brown resinous masses richly cover the sculptural matrix on this excellent example. Very seldom on the market from this locale, a silver mine. In fact, this is the only one I have had. — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Yukonite
Yukonite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Ca₂Fe³⁺₃(AsO₄)₃(OH)₄·4H₂O.
Key properties: Mohs hardness 2–3; specific gravity 2.65; Brownish yellow streak; Vitreous to resinous luster.
IMA symbol Yuk, grandfathered status — known before the IMA’s founding, named in 1913.
A secondary mineral typically altered from arsenopyrite.
It is found associated with Symplesite, argentian galena, pyrargyrite, argentite, chalcopyrite, arsenopyrite, quartz (Tagish Lake, Canada); parasymplesite, köttigite, ogdensburgite.
The name refers to Yukon Territory, Canada, within which the mineral was first found.