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 % RE
Sodium 1.32 % Na
Calcium 6.89 % Ca
Yttrium 22.94 % Y
Silicon 19.32 % Si
Hydrogen 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:
white
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