freakyfauna:

Right & Left Handed Quartz

“The quartz crystals are said to be right or left handed, depending upon whether these faces are to be observed trunctuating the edges between prism and rhombohedron.” — Ford, 1912

Source: William E. Ford Dana’s Manual of Mineralogy
(New York: John Wiley and Sons, Inc, 1912)

Found here.

(via mindsarecolliding)

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