Heavier balls of iron, steel or tungsten carbide require more effort for rotation. These include iron, uranium, aluminium, nickel, platinum, tungsten, titanium, and copper. Most other core materials would have effects between lead and tungsten carbide. This is why there are many more bullets made with tungsten instead of tungsten carbide. There are other minerals not yet routinely mined such as titanium, tungsten, and cobalt. The anode is usually made out of tungsten or molybdenum. Examples of "bcc" include iron, chromium, tungsten, and niobium. Alloys with chromium and tungsten carbides are very hard and wear-resistant. Hydrogen then reacts with tungsten oxide, water is formed again. This including replacing carbon components in the vacuum vessel with tungsten and beryllium ones. Other natural resources include gold, silver, tungsten, and iron. PAR Cans are also predominantly tungsten halogen. Gold is also extracted from complex deposits of tungsten ores. Lamp power also influences color in tungsten lamps. Beryl is often associated with tin and tungsten ore bodies.