Sectile Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Conchoidal, Brittle
Perfect on {010}; poor on {100} and { 1 02}.
Perfect on {110}, poor on {101}, {001} rare