ROMANECHITE (Ba,H2O)2(Mn4+,Mn3+)5O10 (monoclinic) . dark gray botryoidal aggregate . Raubach ,Westerwald/Germany . 硬錳礦很少有晶體出現，深灰色葡萄狀是它最美的結晶方式．硬度 5 - 5.5是一種次生礦物，來自於其它含錳礦物的風化．常見與 barite, hematite, quartz, pyrolusite and other manganese oxide minerals共生. 本礦外觀似舖 上一層高級絨布∼醜得高雅！

著名產地∼Austinville, Wythe County., Virginia, Upper Pennisula of Michigan and Tuscon, Arizona, USA; Schneeburg, Germany; Cornwall, England; Ouro Preto, Minas Gerias, Brazil．

經典名礦欣賞 ．２
NO.50