The following minerals arranged in order of increasing hardness comprise what is known as the Mohs scale of hardness: Talc Gypsum Calcite Fluorite Apatite Orthoclase Quartz Topaz Corundum Diamond The following materials serve in addition to the above scale: the hardness of the fingernail is a little over 2, a copper coin about 3, the steel of a pocket knife a little over 5, window glass 5.5, and the steel of a file 6.5.
(The following minerals; arranged; L:in order of increasing hardness comprise what is known as the Mohs scale of hardness: Talc Gypsum Calcite Fluorite Apatite Orthoclase Quartz Topaz Corundum Diamond The following materials serve in addition to the above scale: the hardness of the fingernail is a little over 2, a copper coin about 3) (the hardness of the fingernail; is; a little over 2) Context(the hardness of the fingernail is,List([258, 291))):(The following materials; serve; in addition to the above scale)
the hardness of the fingernail is,List([258, 291))
The following minerals the hardness of the fingernail The following materials
arranged is serve
L:in order of increasing hardness comprise what is known as the Mohs scale of hardness: Talc Gypsum Calcite Fluorite Apatite Orthoclase Quartz Topaz Corundum Diamond The following materials serve in addition to the above scale: the hardness of the fingernail is a little over 2, a copper coin about 3
a little over 2
in addition to the above scale