Matter & Energy

Matter is composed of atoms or groups of atoms called molecules. The arrangement of particles in a material depends on the physical state of the substance. In a solid, particles form a compact structure that resists flow. Particles in a liquid have more energy than those in a solid. They can flow past one another, but they remain close. Particles in a gas have the most energy. They move rapidly and are separated from one another by relatively large distances.


Cobaltite, mineral, a compound of cobalt, arsenic, and sulfur. It occurs in isometric crystals resembling those of pyrite. It is silver white to red in color and has a metallic luster. The specific gravity of cobaltite is between 6 and 6.4, and the hardness is 5.5. Cobaltite occurs in high-temperature vein deposits or in disseminations in rocks associated with nickel and other cobalt minerals. It is mined as an important ore of cobalt. Large deposits are found in Sweden, Norway, Myanmar (formerly known as Burma), Australia, and Ontario in Canada.