any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities

any chemical element that belongs to the carbon group.

a chemical element with properties in between, or that are a mixture of, those of metals and nonmetals.

a rare steel-grey mineral consisting of silver and germanium and sulfur

a rare reddish-grey mineral consisting of a copper iron germanium sulfide

a rare steel-grey mineral consisting of silver and germanium and sulfur

a rare reddish-grey mineral consisting of a copper iron germanium sulfide