psilomelane (silomelan)

[ of manganese occurring in smooth botryoidal and stalactitic forms and ma ive, and having a color iron-black to steel-gray. psilomelanic (sī"lō-me-lan'ik), a. [ .. The writer found in one of these [manganese nodules) a total of 21.04 per cent. of the psilomelanic part. Encyc. Brit., XV. 479. Psilonotidæ (si-lō-not'i-dē), n. pl. [NL., [NL.,