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Formula: Bi4(SiO4)3
Nesosilicate (insular SiO4 groups), bismuth-bearing mineral
Specific gravity: 6.1 to 6.6
Hardness: 4½
Streak: White
Colour: Orange, orange brown to red brown, bright lime green, colourless
Environments:
At Johanngeorgenstadt, Erzgebirgskreis, Saxony, Germany, Eulytine forms small wine-yellow to colourless,
water-clear globules on quartz accompanied by bismuth and
nickelskutterudite. Colourless to yellowish, pink and black crystals
of eulytine up to 4 mm were found. In addition to the usual tetrahedral habit, the trapezohedron modified by
small cube faces is common as well. The highly lustrous, transparent crystals can appear roundish where many smaller
crystals have joined together in a spherical cluster
(MinRec 55.5.597).
Eulytine from Johanngeorgenstadt - Image
At the type locality, the Schneeberg District, Saxony, Germany, eulytine is a late-stage mineral crystallising in
bismuth-rich hydrothermal quartz veins,
associated with bismuth and quartz
(HOM, Mindat).
Eulytine from Schneeberg - Image
At the Tintic Mining District, Juab County, Utah, USA, several specimens containing intergrown yellow tetrahedral
crystals of eulytine on a matrix of quartz and associated with
mixite, preisingerite and
jarosite were found on the lower dumps of the North Star mine
(MinRec 55.2.201)
Eulytine from Tintic - Image
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