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@kristinmaiart.bsky.socialSep 14, 2026, 1:43 AM

I’m really letting down Team Poison this year, but I have to vote for #Gadolinite because it was discovered by a Finn 🇫🇮
#MinCup2026

@louisedawe.bsky.socialSep 14, 2026, 12:22 AM

I voted #Gadolinite-(Y), but the results say that there are zero votes for this >0 mineral! :D

@crystallised-cricket.comSep 14, 2026, 12:20 AM

Both of todays #MinCup26 minerals' structures do plot out very nicely - #Gadolinite-(Y) has lots of interesting elements sneaking into the structure, but I have to say that the good old amphibole (double chain silicate) structure (with nice variation) of #Riebeckite turned my head today.

Image representing the crystal structure of Riebekite, a version known as flouro-Riebeckite. Red spheres represent oxygen atoms, blue spheres/polygons silicon atoms, yellow spheres/polygons represent sodium atoms, green spheres/polygons represent litium atoms and brown spheres/polygons represent iron atoms. There are also a number of other elements that substitute into the sodium (potassium and calcium) and lithium positions (manganese). The structure is viewed down its c-axis, and is drawn in VESTA from entry #5155 in the American mineralogist database.Image representing the crystal structure of Gadolinite-(Y). Red spheres represent oxygen atoms, blue spheres/polygons silicon atoms, grey spheres/polygons represent yttrium atoms and brown spheres/polygons represent iron atoms. There are also a number of other exotic elements that substitute into the yttrium positions (Neodymium, gadolinium, dysprosium, europium and samarium). The structure is viewed down its c-axis, and is drawn in VESTA from entry #960 in the American mineralogist database.
@louisedawe.bsky.socialSep 14, 2026, 12:18 AM

In this #MinCup26 round, I'm on team #Gadolinite! Even a classic rare-earth mineral family still has new crystal chemistry to reveal, as reported by Chukanov in @actacrystb.iucr.org with a gadolinite-(Y) analogue dominated by both hydroxyl and iron. journals.iucr.org/b/issues/201...

@mineralcup.bsky.socialSep 14, 2026, 12:01 AM

#MinCup26 Round 1 Match 14
Average hardness and dark colours are camouflage for crystalline oddness lurking within blue asbestos #Riebeckite vs rare earth element #Gadolinite-(Y).

VOTE: www.mineralcup.org/2026/vote-re...
RESULTS: www.mineralcup.org/2026/vote-re...