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15 points
NEPHELINES is validvalid
NEPHELINE, [n]
NEPHELINE, a rock-forming mineral, silicate of sodium, potassium and aluminium, colourless, usually crystallizing in hexagonal prisms, also NEPHELITE [n]
NEPHELINE, [n]
NEPHELINE, a rock-forming mineral, silicate of sodium, potassium and aluminium, colourless, usually crystallizing in hexagonal prisms, also NEPHELITE [n]