The Collaborative International Dictionary
Sinopite
Sinopite \Sin"o*pite\, n. [F., fr. L. sinopis (sc. terra), a red earth or ocher found in Sinope, a town in Paphlagoma, on the Black Sea, Gr. ????.] (Min.) A brick-red ferruginous clay used by the ancients for red paint.
Wiktionary
sinopite
n. (context mineralogy English) A brick-red ferruginous clay used as red paint in ancient times.