wolframite

How To Use wolframite In A Sentence

• A greisen is a quartz - mica aggregate containing significant amounts of cassiterite, wolframite, fluorite, topaz, rutile, and tourmaline.
• This and nearby districts are also known for perfect, doubly terminated wolframite crystals to 20 cm, perched on water-clear quartz.
• Minerals such as wolframite, arsenopyrite, fluorite, and quartz are well known from this mine.
• The hunter walked slowly in the forest, followed by his wolframite.
• Arsenopyrite, cassiterite, molybdenite, wolframite, uraninite, and several of the common sulfides have all been observed at various locations.
• In the Democratic Republic of Congo, armed groups force villagers to mine minerals like wolframite and cassiterite. Stanford Students Take Stand Against 'Conflict Minerals'
• On April 23rd, Republican senator Sam Brownback introduced the Congo Conflict Minerals Act of 2009, cosponsored by senators Russ Feingold and Dick Durbin, which would require American companies mining coltan, cassiterite, and wolframite to report annually to the Security and Exchange Commission (SEC), the agency that regulates American financial markets, to disclose the country of origin of the minerals to the Securities and Exchange Commission. Global Voices in English » New bill to increase oversight of American mining companies in DRC
• Tungsten is retrieved from the ore minerals scheelite (CaWO4, calcium tungstate) and wolframite ((Fe, Mn) WO4, iron-manganese tungstate). Tungsten
• Feldspar has been hydrothermally altered by a fluorine-rich water vapor to quartz, mica (usually lithian), topaz and/or tourmaline with fluorite, cassiterite, molybdenite, rutile, and wolframite as typical accessory minerals.
• This is especially important for those valuable minerals which exhibit a brittle to very brittle tenacity, such as cassiterite, sphalerite and the tungsten minerals scheelite and wolframite. Chapter 20