The measurement and study of the angles, dimensions, and geometric properties of crystals.
From 'crystal' combined with Greek 'metron' meaning 'measure.' This term developed as scientists in the 17th-19th centuries created instruments to precisely measure crystal angles and faces.
In 1669, a scientist named Nicolaus Steno noticed that the angles between crystal faces were always exactly the same in different specimens of the same mineral—this was a mind-blowing discovery because it hinted that atoms were arranged in rigid, repeating patterns!
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