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  2. Novaculite - Wikipedia

    en.wikipedia.org/wiki/Novaculite

    Novaculite, also called Arkansas Stone, is a microcrystalline to cryptocrystalline rock type that consists of silica in the form of chert or flint. It is commonly white to grey or black in color, with a specific gravity that ranges from 2.2 to 2.5.

  3. List of types of limestone - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_limestone

    Dent Marble (not a "true marble"; Crinoidal limestone) Frosterley Marble – northern England (not a "true marble") Hamstone – Building stone from Somerset; Headington stone – A limestone from Oxford; Hopton Wood stone – Type of limestone; Kentish ragstone, also known as Kentish rag – Hard grey limestone in Kent, England; Ketton stone

  4. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Chalk – Soft carbonate rock; Chert – Hard, fine-grained sedimentary rock composed of cryptocrystalline silica; Claystone – Clastic sedimentary rock composed primarily of clay-sized particles; Coal – Combustible sedimentary rock composed primarily of carbon; Conglomerate – Sedimentary rock composed of smaller rock fragments

  5. 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.

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  8. Cohesion (geology) - Wikipedia

    en.wikipedia.org/wiki/Cohesion_(geology)

    Cohesion is the component of shear strength of a rock or soil that is independent of interparticle friction.. In soils, true cohesion is caused by following: Electrostatic forces in stiff overconsolidated clays (which may be lost through weathering)

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    Storyworth can be as easy or as hard as you want to make it. If you’re the sender, soliciting a family member for their thoughts and memories, it’s pretty much a “set it and forget it ...

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