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Minerals
Flash Cards about Minerals and Science
14
Science
7th Grade
10/05/2011

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Term
Mineral
Definition
a naturally occuring inorganic solid with a definite chemical composition and an orderly arrangement of atoms. *About 4,000 different minerals are found on Earth*
Term
Crystalline
Definition
atoms are arranged in a pattern that is repeated over and over again.
Term
Crystal
Definition
a solid in which the atoms are arranged in orderly repeating patterns. Crystals can form by cooling magma or evaporting solutions.
Term
Magma
Definition
Hot melted rock under the Earth's surface.
Term
Silicate
Definition
Silicates are the most common rock-forming minerals. They contain silicon and oxygen which are the two most abundent elements on the Earth's crust. *Feldspar and quartz*
Term
Hardness (of a mineral)
Definition
A measure of how easily a mineral can be scratched. It uses the Mohs Scale from 1-10.
Term
Luster
Definition
The way a mineral relects light is known as luster. Metallic, pearly, dull, nonmetallic, silky, and glassy.
Term
Specific gravity
Definition
The ratio of its weight compared with the weight of an equal volume of water.
Term
Streak
Definition
Color of a mineral when it is in a powdered form.
Term
Cleavage
Definition
The way a mineral breaks.
Term
Fracture
Definition
Minerals that break with uneven, rough, or jagged surfaces have fracture.
Term
Gems
Definition
highly prized minerals becuase they are rare and beautiful.
Term
Ore
Definition
Mineral or rock mined for a profit.
Term
Rock
Definition
Mixture of minerals, rock fragments, volcanic glass, organic matter, or other natural materials.
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