IMA mineral species

Thomasclarkite-(Y)

(Na,Ce)(Y,REE)(HCO₃)(OH)₃·4H₂O

Carbonate mineral.

Yellow White & Clear

Thomasclarkite-(Y) specimen — Thomasclarkite-(Y)-107522.jpg · Wikimedia Commons (see file page for author & license)

Properties

🔷 Monoclinic✏️ streak white

Chemical formula	(Na,Ce)(Y,REE)(HCO₃)(OH)₃·4H₂O
Elements	Na, Ce, Y, H, C, O
Crystal system	Monoclinic
Mohs hardness	—
Density	—
Streak	white
Color	—
IMA symbol	Tcl-Y
Nickel–Strunz class	5.DC.20

“—” means no reliable value in Wikidata yet. Check Mindat for full data.

🌍 Where it's found

Type locality (where it was first described): Poudrette quarry, Canada

Type locality
Notable source / deposit
Country of origin

Marker positions are approximate (region or locality level). Type localities from Wikidata; notable sources curated by Crystopedia.

Learn more

Thomasclarkite-(Y) on Mindat.org
Wikipedia article
Wikidata item Q7795558 (source of this page's data – you can correct it there)