Black grain of gadolinite-(Y) in pale feldspar from hybrid LCT-NYF pegmatite in Høydalen, Norway. FOV 2 cm. — Photo: Zbynek Burival · CC BY-SA 4.0
Gadolinite
A beryllium-bearing rare-earth silicate — historically important as the source of the elements gadolinium and ytterbium.
Intro adapted from Wikipedia (CC BY-SA).
Gadolinite is a mineral group, with the chemical formula (Y,Ce)₂FeBe₂Si₂O₁₀.
It crystallizes in the monoclinic crystal system.
Key properties: Mohs hardness 6.5–7; typically black or brown or green.
Collections: Collector Favorites, Rare & Remarkable.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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