Manganese ore Manganese is a silvery-gray metal similar with iron. It is hard and very brittle, difficult to fuse, but easy to oxidize. The most important manganese ore is pyrolusite. Other manganese ores with high economic value usually closely related with the iron ores.  About 80% of the known world manganese resources are found in South ...

Tin ore Tin is a silver-white metal with low melting point, it is highly ductile and malleable, resistant to corrosion and fatigue. Tin can be alloyed with other metals, it is non-toxic and is easily recycled. Tin has many important uses throughout the world. Tin is often used in many alloys, most notably tin/lead soft ...