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Formula: Ca2ScSn(Si2O7)(Si2O6OH)
Sorosilicate (Si2O7 groups),
kristiansenite group,
scandium- and tin-
bearing mineral
Crystal System: Triclinic
Specific gravity: 3.64 calculated
Hardness: 5½ to 6
Streak: White
Colour: Colourless, white, slightly yellowish
Luminescence: Nonfluorescent
Environments
Pegmatites
Hydrothermal environments
Localities
Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy. The miarolitic NYF
(niobium yttrium fluorine)
pegmatites hosted by the calcalkaline Baveno pluton contain
an important scandium-minerals association; several of the known
scandium mineral species occur as fine crystals in the cavities of the
Baveno granite. Bazzite was
the first scandium mineral found and described from here. Baveno is also the
type locality for the
scandium-bearing minerals
cascandite,
scandiobabingtonite and
jervisite. Thorveitite and
kristiansenite have also been identified from Baveno
(CM 57.489-498).
Kristiansenite from Baveno - Image
At the type locality, the Heftetjern pegmatite, Tørdal, Drangedal, Vestfold og Telemark, Norway, kristiansenite
occurs as colourless, white, or slightly yellowish tapered crystals, to 2 mm long, and as aggregates to 2 mm across.
Kristiansenite is a late-stage hydrothermal mineral, occurring in vugs in the
granite
pegmatite.
Associated minerals include quartz,
albite, apatite,
stilpnomelane,
scandiobabingtonite,
ixiolite, hingganite-(Y),
cerium-bearing epidote,
titanite, bazzite,
milarite and cassiterite
(AM 88.251, CM 41.815).
Kristansenite from the Heftetjern pegmatite
- Image
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