Gerenite-(Y)

General Information: Chemical Formula:(Ca,Na)2(Y,REE)3Si6O18·2(H2O) Composition:(Molecular Weight = 872.18 gm)La,Ce,Pr,Nd,Sm,12.38 % RESodium 1.32 % NaCalcium 6.89 % CaYttrium 22.94 % Y Silicon 19.32 % SiHydrogen 0.46 % H Oxygen 36.69 % O  Empirical Formula: Ca1.5Na0.5Y2.25REE0.75Si6O18·2(H2O) Environment:Cyclosilicate with structural similarites to kainosite-(Y) and leifite. Found in an aplite-pegmatite lens. Locality:Strange Lake peralkaline complex on the Quebec-Labrador border, Canada. Name Origin:For Richard Geren (1917-), former executive vice-president of the Iron Ore Company of Canada. Mr. Geren initiated and supported the exploration program of the Strange Lake deposit.Physical Properties: Cleavage:[101] Indistinct Color:white or cream white. Density:3.3 - 3.52, Average = 3.41 Diaphaniety:Translucent Habits:Microscopic Crystals - Crystals visible only with microscopes., Anhedral Grains - Granular minerals without the expression of crystal shapes, Hardness:5 - Apatite Luminescence:Non-fluorescent. Luster:Vitreous (Glassy) Streak:whiteMore details...