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Hellandite-(Y): (Ca,REE)4(Y,Ce)2(Al,[ ])2[Si4B4O22](OH)2
Comments: Short-prismatic crystal of dark-brown hellandite-(Y) in granitic pegmatite.
Location: Tusion River Valley, Pamir Mts, Viloyati Mukhtori Gorno-Badakhshan (Viloyati Badakhshoni Kuni), Tajikistan.
Scale: FOV is 2x1.7 cm.
© Pavel M. Kartashov