IMA mineral species

Allanite-(Y)

{CaY}{Al₂Fe²⁺}(Si₂O₇)(SiO₄)O(OH)

Epidote supergroup, sorosilicate mineral.

Black

Allanite-(Y) specimen
Allanite-(Y) samples (a).png · Wikimedia Commons (see file page for author & license)

Properties

Chemical formula{CaY}{Al₂Fe²⁺}(Si₂O₇)(SiO₄)O(OH)
ElementsCa, Y, Al, Fe, Si, O, H
Crystal systemMonoclinic
Mohs hardness—
Density—
Streak—
Colorblack
IMA symbolAln-Y
Nickel–Strunz class9.BG.05b

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