Käännöksiä ei löytynyt valitulle kohdekielelle.
(mineralogy) A trigonal-ditrigonal pyramidal black mineral containing aluminum, boron, hydrogen, iron, magnesium, oxygen, potassium, silicon, and sodium.
The crystals here are black, lustrous, and 1-2mm in size. They richly cover one side of the matrix, and the povondraite winds its way through the fissures in the rock.