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2. Sandstone - Wikipedia

   en.wikipedia.org/wiki/Sandstone

   Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains, ... Because of the hardness of individual grains, ...

3. Mohs scale - Wikipedia

   en.wikipedia.org/wiki/Mohs_scale

   Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale. The Mohs scale (/ m oʊ z / MOHZ) of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of minerals through the ability of harder material to scratch softer material.

4. Hardnesses of the elements (data page) - Wikipedia

   en.wikipedia.org/wiki/Hardnesses_of_the_elements...

   Mohs hardness of materials (data page) Vickers hardness test; Brinell scale This page was last edited on ...

5. Greywacke - Wikipedia

   en.wikipedia.org/wiki/Greywacke

   Greywacke or graywacke (German grauwacke, signifying a grey, earthy rock) is a variety of sandstone generally characterized by its hardness (6–7 on Mohs scale), dark color, and poorly sorted angular grains of quartz, feldspar, and small rock fragments or sand-size lithic fragments set in a compact, clay-fine matrix.

6. Concretion - Wikipedia

   en.wikipedia.org/wiki/Concretion

   Concretions vary in shape, hardness and size, ... are found associated with sandstone outcrops of the Frontier Formation in northeast Utah and central Wyoming.

7. Hardness - Wikipedia

   en.wikipedia.org/wiki/Hardness

   When testing coatings, scratch hardness refers to the force necessary to cut through the film to the substrate. The most common test is Mohs scale, which is used in mineralogy. One tool to make this measurement is the sclerometer. Another tool used to make these tests is the pocket hardness tester. This tool consists of a scale arm with ...

8. Today's Wordle Hint, Answer for #1257 on Wednesday, November ...

   www.aol.com/lifestyle/todays-wordle-hint-answer...

   If you’re stuck on today’s Wordle answer, we’re here to help—but beware of spoilers for Wordle 1257 ahead. Let's start with a few hints.

9. Arkose - Wikipedia

   en.wikipedia.org/wiki/Arkose

   Arkose (/ ˈ ɑːr k oʊ s,-k oʊ z /) or arkosic sandstone [1] is a detrital sedimentary rock, specifically a type of sandstone containing at least 25% feldspar. [ 2 ] [ 3 ] Arkosic sand is sand that is similarly rich in feldspar, and thus the potential precursor of arkose.