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Ridgeway scale

Ridgeway scale Vickers Bohme Friatester Equotip apparatus... [Pg.26]

Mineral or material (in bold the original Mohs minerals) Mohs scale (1822) Rosival scale Ridgeway scale (1933) Povarennyk h scale (1962) Vickers hardness Knopp hardness ... [Pg.764]

Material CAS Registry Number Mohs scale Ridgeway s scale WoodeU s scale Knoop hardness, kN/m " ... [Pg.9]

Material Mohs scale Ridgeway s scale Wooilell s scale Knoop hardness3, kN/m b... [Pg.2]

Alaterial CAS Registry Number Alohs scale Ridgeway s3 scale WoodeU sb scale Knoop hardness, kN/m2d... [Pg.9]

Table 36.6 gives Mohs hardness values for the Gem Scale and for some other materials as a comparison. (Note that in Chapter 16 we consider the extended version as defined by Ridgeway, but it is not nearly so widely used in the Gem industry.) Table 36.6 also includes a relative hardness scale. Remember that minerals are anisotropic, so the Mohs hardness of kyanite is -4.5 when scratched parallel to the long axis and -6.5 when scratched perpendicular to the long axis. Incidentally, this material will not be confused with kaolinite using this test since the latter has a Mohs hardness of 2-2.5. [Pg.663]

Hardness number Mohs scale Ridgeway s extension of Mohs scale Knoop hardness of expanded scale materials... [Pg.25]

See other pages where Ridgeway scale is mentioned: [Pg.856]    [Pg.9]    [Pg.807]    [Pg.856]    [Pg.9]    [Pg.9]    [Pg.13]    [Pg.763]   
See also in sourсe #XX -- [ Pg.764 ]



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