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Tornebohmite-(Ce): (Ce,La,Nd)2Al(SiO4)2(OH)
Comments: Vein of dark green tornebohmite-(Ce) with selveges of black allanite-(Ce) in a K-feldspar matrix. Location: Jamestown District, Boulder Co., Colorado, USA. Scale: Specimen Size 6.5 x 3.8 x 2.5 cm. © Rob Lavinsky