2. Noun. (minerology) A manganese tungstate mineral that forms reddish-brown to black monoclinic prismatic submetallic crystals. ¹
¹ Source: wiktionary.com
2. Noun. (minerology) A manganese tungstate mineral that forms reddish-brown to black monoclinic prismatic submetallic crystals. ¹
¹ Source: wiktionary.com