No images
Formula: Gd(PO4)
Anhydrous phosphate of gadolinium,
monazite group
Crystal System: Monoclinic
Specific gravity: 5.55 calculated
Environments
Metamorphic environments
Hydrothermal environments
Monazite-(Gd) is a new mineral, approved in 2022.
Localities
At the type locality, the Zimná Voda uranium occurrence, Prakovce, Gelnica District, Košice Region, Slovakia,
monazite-(Gd) forms anhedral domains (≤100 μm, mostly 10–50 μm in size), in close association with
monazite-(Sm),
gadolinium-bearing
xenotime-(Y),
gadolinium-bearing
hingganite-(Y),
fluorapatite and uraninite.
All these minerals are hosted in a rare earth element – uranium –
gold quartz –
muscovite vein, hosted in
phyllites in an exocontact to
granites.
This exotic rare earth element signature and precipitation of
gadolinium-bearing mineral assemblage is a product of selective
complexing and enrichment in middle rare earth elements in low-temperature hydrothermal fluids by alteration of
primary uraninite,
brannerite and fluorapatite
on a micro-scale
(MM 87.4.568-574).
Back to Minerals