Gypsum - WikipediaA massive fine-grained white or lightly tinted variety of gypsum, called alabaster, has been used for sculpture by many cultures including Ancient Egypt, Mesopotamia, Ancient Rome, the Byzantine Empire and the Nottingham alabasters of Medieval England. Mohs scale of mineral hardness, based on scratch hardness.gypsum and salt on hardness scale,Mohs Scale of Hardness - Mineralogical Society of AmericaOne of the most striking examples of this is kyanite, which has a hardness of 5.5 parallel to the 1 direction ( c-axis), while it has a hardness of 7.0 parallel to the 100 direction ( a-axis). Talc (1), the softest mineral on the Mohs scale has a hardness greater than gypsum (2) in the direction that is perpendicular to the cleavage.
Material Hardness Tables, Ted Pella, Inc.material hardness, mohs, knoop. . Hardnes Number, Original Scale, Modified Scale. 1, Talc, Talc. 2, Gypsum, Gypsum. 3, Calcite, Calcite. 4, Fluorite, Fluorite. 5, Apatite, Apatite. 6, Orthoclase, Orthoclase. 7, Quartz, Vitreous Silica. 8, Topaz, Quartz or Stellite . Carbon, 10.0, Rock Salt (halite), 2. Carborundum, 9-10, Ross'.hardness table - Prater IndustriesMOHS HARDNESS TABLES. HARDNESS NUMBER. ORIGINAL SCALE. MODIFIED SCALE. 1. TALC. TALC. 2. GYPSUM. GYPSUM. 3. CALCITE. CALCITE. 4. FLUORITE. FLUORITE. 5. APATITE. APATITE. 6. ORTHOCLASE . ROCK SALT (HALITE). 2. CARBON. 10.0. ROSS' METAL. 2.5 - 3.0. CARBORUNDUM. 9 - 10.
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