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Gemstones, Minerals & Fossils
Gemstones and Minerals
Holes in sandstone
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<blockquote data-quote="Hunting the yellow" data-source="post: 367073" data-attributes="member: 68"><p>gravel/sand worn the water swirls around in a cycle and with it brings small sand in possibly harder types of sand than sandstone like small grains of corundum witch sapphires are from corundum being around 9 on the hardness scale (10 a diamond 1 chalk) means the sandstone witch is around 5 to 6 on the hardness scale gets worn away by the harder sand particles with the help of water.</p><p></p><p>I hope this makes some sense and not too hard on understanding.</p></blockquote><p></p>
[QUOTE="Hunting the yellow, post: 367073, member: 68"] gravel/sand worn the water swirls around in a cycle and with it brings small sand in possibly harder types of sand than sandstone like small grains of corundum witch sapphires are from corundum being around 9 on the hardness scale (10 a diamond 1 chalk) means the sandstone witch is around 5 to 6 on the hardness scale gets worn away by the harder sand particles with the help of water. I hope this makes some sense and not too hard on understanding. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
Holes in sandstone
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