olivine, peridot

main, principal

centrality

ingredient / (mathematics) entity

stone

(astronomy, mythology) Earth; Terra

(mineralogy) peridotite

songbun (a system of ascribed status in North Korea, based on one's political, social, and economic background and the behaviour of relatives)

stone; rock

counter for gemstones used as bearings in watches and other devices / (slang, electronics) counter for transistors, especially discrete ones