Dana Wrong - Bad Science in 1837 System of Mineralogy

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James Dwight Dana & Danalite from Rockport, Essex County, Massachusetts

mineral photo Rob Lavinsky

"The usual method of observing the polarity of turmaline is to place the heated crystal on a brass support which turns on a pivot like a magnetic needle. By presenting the poles of a magnet it will be found that the north pole of a magnet will attract one extremity of the crystal and repel the other." This is wrong. A magnet has no such effect on electrically charged bodies.

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Unrelated to this post, below is an example of

eclectic science esoterica 

by GFCL btr

A Manometer

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