Minerals are naturally occurring substances that are solid and amorphous. They are described by different physical properties such as crystal structure, luster, hardness, color, fracture and more. Metallic minerals are m... More » Science Chemistry

Identify minerals and gems at and; by definition, rocks lack a particular chemical composition or structure and cannot be identified per se. The minerals that compose a rock may be identifi... More » Science Earth Science Geology

Coal is not considered a mineral because it does not have a solid, uniform crystal structure, meaning it doesn't fit the primary definition of a mineral. Coal is primarily made of carbon, but its properties can vary even... More » Science Earth Science Geology
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Sodium, potassium, calcium, magnesium, manganese and chromium are some examples of metallic elements. More than 90 of the 118 known elements are considered metals. More » Science Chemistry

Metallic salts are used in fireworks to produce different colors of light. When metallic salts are heated up, they absorb energy and their electrons reach higher, excited energy levels. When the electrons return back to ... More » Science Chemistry

Arsenic is a naturally occurring semi-metal element. Its atomic number is 33, and its only stable isotope has an atomic weight of 74.92. Arsenic has been used since ancient times, but it was first isolated by the German ... More » Science Chemistry

Enthlapy is a thermodynamic property of a system that expresses the ability to perform non-mechanical work and release heat. Enthalpy is represented as H, while specific enthalpy is represented as h. More » Science Chemistry