This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Mohs mineralogy vol plate . en Copper engravings of crystal structures by William Miller from Treatise on Mineralogy by Friedrich Mohs translated by William Haidinger FRSE Treatise on mineralogy or The natural history of the mineral kingdom by Frederick Mohs Professor in the Mining Academy at Freiburg translated from the German