natural chalk stones background soft white porous sedimentary carbonate rock form limestone composed the |
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| navigate by keyword : calcium carbonate organic debris diatoms radiolarians silica rock diatomite quarry mining stone natural chalk stones background soft white porous sedimentary limestone mineral calcite abstract backdrop beige construction crushed decoration texture decorative design exterior floor geology granit gravel gray grey grunge industrial landscape marble material mountain rubble surface textured wall |
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| Natural chalk stones background. Chalk is a soft, white, porous, sedimentary carbonate rock, a form of limestone composed of the mineral calcite. Rock forms from the ooze. Mining concept |
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