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minerala naturally occurring, inorganic solid that has a crystal structure and a definite chemical composition
inorganicthe mineral cannot arise from materials that were once a part of a living thing
crystala repeating pattern of a mineral's particles forms a solid
elementa substance composed of a single kind of atom
compoundtwo or more elements are combined so that the elements no longer have distinct properties
Mohs hardness scalea scale that ranks ten minerals from softest ot hardest
Talcsoftest known mineral
diamondhardest known mineral
apatitemedium soft/hard mineral
streakthe color of the mineral's powder
lusterhow a mineral reflects light from its surface
densitythe mass in a given space
crystal systemthe "shape" of each crystal inside the mineral
cleavagehow the atoms in its crystal is arranged determines this, how it splits easily along flat surfaces
fracturehow a mineral looks when it breaks apart in an irregular way
fluorescenceminerals that flow under ultraviolet light

Earth Science & Marine Science
River Hill High School

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