big gray raw pyrolusite mineral rock stone isolated white background |
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| navigate by keyword : raw specimen gneiss metamorphic rock stone isolated white background formed high grade regional metamorphism solid collection mineral grains grow cemented rocks large small pebbles coal black ore geology carbon piece macro fuel crystal nature volcanic material natural fossil granite lava mining volcano metal basalt aphanitic fine grained extrusive igneous big texture pattern wall textured surface brown marble concrete backgrounds rough closeup old gray grunge detail cork backdrop abstract foliated pyrolusite |
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| A rock is a solid collection of mineral grains that grow or become cemented together. Some rocks are large while others are small. Small rocks are called pebbles. |
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