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  2. Diorite - Wikipedia

    en.wikipedia.org/wiki/Diorite

    Diorite was also used for stone vases by Bronze Age craftspeople, who developed considerable skill at polishing diorite and other stones. [38] The Egyptians had become skilled at shaping diorite and other hard stones by 4000 BCE. [39] A large diorite stela in the Louvre Museum dating to 1700 BCE is inscribed with the Code of Hammurabi. [40]

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

  5. Scratch hardness - Wikipedia

    en.wikipedia.org/wiki/Scratch_hardness

    The first scientific attempt to quantify materials by scratch tests was by mineralogist Friedrich Mohs in 1812 (see Mohs scale). [3] [4] The Mohs scale is based on relative scratch hardness of different materials; with talc assigned a value of 1 and diamond assigned a value of 10. [5] Mohs's scale had two limitations: it was not linear, and ...

  6. Oligoclase - Wikipedia

    en.wikipedia.org/wiki/Oligoclase

    Oligoclase occurs, often accompanying orthoclase, as a constituent of plutonic igneous rocks such as granite, syenite, and diorite. It occurs in porphyry and diabase dikes and sills as well as in the volcanic rocks andesite and trachyte, and in mugearite where its presence is a defining feature. It also occurs in gneiss.

  7. Friedrich Mohs - Wikipedia

    en.wikipedia.org/wiki/Friedrich_Mohs

    Carl Friedrich Christian Mohs (/ m oʊ z / MOHZ, German: [ˈfʁiːdʁɪç ˈmoːs]; 29 January 1773 – 29 September 1839) was a German chemist and mineralogist. He was the creator of the Mohs scale of mineral hardness. [1] Mohs also introduced a classification of the crystal forms in crystal systems independently of Christian Samuel Weiss. [2]

  8. Andesine - Wikipedia

    en.wikipedia.org/wiki/Andesine

    Mohs scale hardness: 6 – 6.5: Luster: Subvitreous to pearly: Streak: White: ... Andesine occurs in intermediate igneous rocks such as diorite, syenite, and andesite.

  9. Superhard material - Wikipedia

    en.wikipedia.org/wiki/Superhard_material

    Whereas the Vickers scale is widely accepted as a most common test, [11] there remain controversies on the weight load to be applied during the test. This is because Vickers hardness values are load-dependent. An indent made with 0.5N will indicate a higher hardness value than an indent made with 50N.