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 μÎλας (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
29 May 2024
(noun) an economic policy adopted in the former Soviet Union; intended to increase automation and labor efficiency but it led eventually to the end of central planning in the Russian economy
According to Guinness World Records, on 25 September 2016, the Birla Institute of Management Technology (India) in Uttar Pradesh, India, constructed the largest coffee cups pyramid consisting of 23,821 cups. They used paper takeaway coffee cups to build the pyramid.
