pitchstone

Noun

 * 1)  a natural glass, rich in microscopic crystallites, formed by the rapid cooling of lava or magma

Translations

 * Chinese:
 * Mandarin: 松脂岩
 * Finnish: laavalasi
 * Japanese: 松脂岩
 * Polish: smołowiec
 * Russian: смоляной камень
 * Swedish: pechsten, becksten