Monday, 20 May 2013

On Double Crystals of Fluor Spar - Whewell 1821

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Photo Rob Lavinsky
Heights Mine twin.

The interpenetrant fluorite twins of Weardale are geometrically explained. "Aldstone Moor" should read "Alston Moor."  However the crystals are much more likely to be of Weardale origin.

This review from The British Critic -

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Unrelated to this post, below is an example of
eclectic science esoterica 

Sir William Crookes

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