Formula: BeYb(SiO4)(OH)
Nesosilicate (insular SiO4 groups), gadolinite group, beryllium and ytterbium bearing mineral
Specific gravity: 4.83 calculated
Hardness: 6 to 7
Streak: White


Hingganite-(Yb) is formed by very late stage replacement reactions in microcline variety amazonite - rich pegmatites, associated with plumbomicrolite, fluorite, keiviite-(Yb) and bastnäsite (HOM).


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 plumbomicrolite and 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 and bertrandite (R&M 95.3.271-272).

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