psilomelane
(noun) a mineral consisting of hydrated basic oxide of manganese and barium; a source of manganese
Source: WordNet® 3.1
from Gr. ψιλός (naked,smooth) and μέλας (black)
psilomelane (usually uncountable, plural psilomelanes)
Any hard, black hydrous manganese oxide with variable amounts of barium and potassium.
Source: Wiktionary
Psi*lom"e*lane, n. Etym: [Gr. (Min.)
Definition: A hydrous oxide of manganese, occurring in smooth, botryoidal forms, and massive, and having an iron-black or steel-gray color.
Source: Webster’s Unabridged Dictionary 1913 Edition
10 June 2025
(noun) the discipline that studies the principles of transmiting information and the methods by which it is delivered (as print or radio or television etc.); “communications is his major field of study”
The world’s most expensive coffee costs more than US$700 per kilogram. Asian palm civet – a cat-like creature in Indonesia, eats fruits, including select coffee cherries. It excretes partially digested seeds that produce a smooth, less acidic brew of coffee called kopi luwak.
