an oxide of manganese found naturally as hausmannite.
一种锰的氧化物，作为黑锰矿天然存在。
A mixture of black manganese oxide minerals.
硬锰矿一种黑色氧化锰矿的混合物
A soft, black to dark gray mineral, MnO2, the commonest and most important secondary ore of manganese.
软锰矿一种软的，黑色至灰黑色的矿物质，MnO2，是最普通最重要的锰矿
a black mineral consisting of basic manganese oxide; a source of manganese.
一种黑色矿物，由基性氧化锰组成，是锰的来源。
Geological Features and Genesis for the Xugu Mn Deposit in Heishui, Sichuan
四川黑水县徐古锰矿徐古矿段成矿地质特征及成因
The mineral form of black iron oxide, Fe3O4, that often occurs with magnesium, zinc, and manganese and is an important ore of iron.
磁铁矿黑色氧化铁矿，Fe3O4，经常和镁、锌以及锰共生，是一种重要的铁矿石
Research on Preparation of Chemical Manganese Dioxide for Alkaline Zn-Mn Battery from a Low-grade Manganese Carbonate Ore
贫菱锰矿合成碱锰电池级化学二氧化锰研究
Method for determination of total manganese content inmanganese ores
GB/T1506-1979锰矿石中全锰量的测定
Dianjiejinzhumeng, manganese series product processing, marketing.
电解金属锰，锰矿系列产品加工，销售。
Resourcesof Mn-ores and Development of EMM;
中国的锰矿资源和电解金属锰的发展
Uncertainty Assessment for Manganese Proportion Testing in Manganese Ore
锰矿石中锰含量测定的不确定度评估
Research on technological conditions of low-grade rhodochrosite leaching manganese
低品位菱锰矿浸出锰的工艺条件研究
Study on Continuous Titration Detemination of Manganese and Iron in the Manganese Ore
中碳锰铁矿中锰和铁的连续测定研究
Determination of Manganese Ore Capacity of Manganese Uncertainty Evaluation
容量法测定锰矿石中锰不确定度评定
pockets of manganese in the rock;
岩石中含有锰的矿层；
Study on Technology for Preparation Manganese Carbonate or Manganese Suphate from Leaching Silver-Manganese Ore Solution;
从银锰矿的浸锰液中制取硫酸锰和碳酸锰的工艺研究
A Technological Investigation of the Production of Manganese Sulfate Using Soft Manganese Extract and Sulfuric Iron Ore in Sulfuric Acid;
软锰矿——黄铁矿直接酸浸生产硫酸锰的工艺研究
Investigations of Preparating Lead-sulfate and Mangano-manganic-oxide from Galena Concentrate and Pyrolusit;
从方铅矿精矿和软锰矿直接制备硫酸铅和四氧化三锰材料的研究