Minerals

 __**Minerals:**__ 1) It must occur naturally 2) It must have characteristic chemical composition 3) It must have atomic structure 4) It must be a solid 5) It must be organic       **__Cleavage__**: The way a mineral breaks- if the pieces are almost the same shape as they were before the mineral was broken then the mineral shows cleavage. Ex: Mica breaks into thin square sheets __**Fracture**__:    If a mineral does not break evenly then it shows fracture.

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 __**Hardness**__: Measured by Moh's Scale of Hardness __The scale is:__=====   **1) Talc 2) Gypsum 3) Calcite 4) Fluorite 5) Apatite 6) Orthoclase 7) Quartz 8) Topaz 9) Cornundrum 10) Diamond**
 * Fingernail- 2.5*
 * Glass- 6-7*

<span style="font-family: Arial,Helvetica,sans-serif">__**Luster**__: The way a mineral reflects light


 * __Streak__**: The mark a mineral leaves on a streak plate

This is the minerals page from the Earth Science Reference Tables:



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