MineralsGroup4

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====a solid inorganic substance of natural occurrence, "Minerals are naturally-occurring inorganic substances with a definite and predictable chemical composition and physical properties. ====

Characteristics of a Mineral
====Solid Inorganic, Naturally Orcurring Defintite, Chemical Compostion Definite Crystalline Structure, Element or compound ====

= Physical property videos. =

Physical Properties of Minerals
====hardness, luster, cleavage, crystal structure, chemical formula, streak, radioactivity, refraction, magnetism, and pleochroism. This site goes more into detail with the definitions : ->[|http://www.windows.ucar.edu/tour/link=/earth/geology/mineral_id1.html&edu=high]< -  ==== --

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. **Hardness** simply describes how hard a mineral is. This can be tested by scratching the mineral. Check this out... A mineral can only be scratched by something that's harder than it.

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 **Luster is** a gentle sheen or soft glow, esp. that of a partly reflective surface

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Color is the property possessed by an object of producing different sensations on the eye as a result of the way the object reflects or emits light

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Streak is <span style="color: #000000; font-family: Baskerville; font-size: medium; font-weight: normal; line-height: normal;">a long, thin line or mark of a different substance or color from its surroundings <span style="color: #000000; font-family: Baskerville; font-size: medium; font-weight: normal; line-height: normal;">

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 * Cleavage and Fracture is** is the tendencyof crystalline materials to split along definite crystallographic structural planes.

<span style="color: #7700ff; font-family: 'Comic Sans MS',cursive; font-size: 15px;">Most common mineral : Quartz
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