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anorthosite (labradorite); large cut and polished slab showing some irridescent schiller

*non loc.* unknown This is almost certainly the specimen referred to on P.36 of Captin Laskey's 1813 description of the Hunterian Museum: "A very large slab of the LABRADORE HORNBLENDE, commonly called LABRADORE SPAR, rich and resplendent in colour, varying blue, green, copper, flame, and yellow colours, as the light is brought to act on it. ". It is very similar in size and shape to a large polis…