English: A typical crystal of augite is represented in fig. 1, whilst fig. 2 shows a crystal twinned on the orthopinacoid (r′). Illustration from 1911 Encyclopædia Britannica, article Augite.
This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.
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