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Formula: BeYb(SiO4)(OH)
Nesosilicate (insular SiO4 groups),
gadolinite subgroup,
gadolinite group,
gadolinite supergroup,
beryllium and ytterbium bearing mineral
Crystal System: Monoclinic
Specific gravity: 4.83 calculated
Hardness: 6 to 7
Streak: White
Colour:Colourless
Environments
Hingganite-(Yb) is formed by very late stage replacement reactions in microcline variety
amazonite-rich pegmatites, associated with
fluorite,
keiviite-(Yb) and bastnäsite
(HOM).
Localities
At the type locality, Ploskaya Mountain, Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia, acicular
crystals of hingganite-(Yb) to 2 mm, in spherical aggregates, are associated with
keiviite-(Yb)
and bastnäsite (Mindat)
in a microcline variety amazonite pegmatite on
fluorite, as a product of very
late stage replacement reactions
(Dana, AM 69.811).
At Mount Rosa, El Paso county, Colorado, USA, beryl is absent, but late-stage to
secondary beryllium-bearing minerals
are present. Hingganite-(Yb) has been found in a quartz cavity
with crystals of quartz, magnetite,
pyrite, hematite and
bertrandite, and massive hingganite-(Yb) was found in a
quartz vug associated with magnetite,
pyrite, fluorite,
hematite, goethite,
kainosite-(Y) and bertrandite
(R&M 95.3.271-272).
At Fairview, Stove Mountain, El Paso County, Colorado, USA, vugs in quartz
veins host 0.5 mm chalk-white to light tan masses of hingganite-(Yb) associated with crystals of clear
quartz,
magnetite, pyrite,
hematite and bertrandite
(R&M 97.5.418).
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