...hardness and specific gravity. The degrees of hardness are expressed by Mohs in the following manner : 1 expresses the hardness of Talc, 2 Gypsum, 3 .' Calcareous spar, 4 Fluor spar, 5 Apatite, 6 Feldspar, Quartz, 9 expresses the hardness of Corundum, 10 Diamond. Professor Mohs has arranged minerals in to...

...combinations with one another, entitle him to <he first rank as a crystallographer. The natural-historicul properties of compound minerals are treated of in...philosophical part of the science. It determines the idea i it' the species ; fixes the principle of classification ; and upon the idea of the species it founds,...

...combinations with one another, entitle him to the first rank ns a crystallographer. The naturc 1-historical properties of compound minerals are treated of in...under which mineralogy is developed, according to Mobs, is the Oieory of the system, which contains the reasoning or philosophical part of the science....

...6. Unctuosity ; 7- Coldness; and, 8 Density. 1 expresses the hardness of talc ; 2 gypsum ; 3 cale, spar ; 4 fluor spar ; 5 apatite ; 6 feldspar ; 7 quartz ; 8 topaz ; 9 corundum 10 diamond. A simple rock is one unmixed homogc neous substance, whatever be its consti tuent elementary parts...

...crystallized solid, and ending with the hardest. TABLE HI. Hardness. Degree. Standard of comparison. 1 Talc 2 ..... Gypsum 3 ..... Calcareous spar 4 ..... Fluor spar 5 ..... Apatite 6 Feld spar 7 ..... Quartz 8 Topaz 9 ..... Sapphire 10 ..... Diamond § 67. Elasticity is that property...

...scratch any one of the preceding. The scale, thus constructed, is as follows: 1. talc; 2. rock salt; 3. calcareous spar; 4. fluor spar; 5. apatite ; 6. feldspar ; 7. quartz ; 8. topaz ; 9. sapphire ; and 10. diamond ; which is the hardest substance known. To these, Breithanpt has added two...

...rearrangement of the molecules. TABLE I.—SCALE OF HARDNESS. 1 Talc. 2 Rock Salt. 3 Calcspar. 4 Fluorspar. 5 Apatite. 6 Feldspar. 7 Quartz. 8 Topaz. 9 Corundum. 10 Diamond. TABLE II. —COMPARATIVE TENACITY OF DIFFERENT WOODS. This table gives the breaking load, in pounds,...

...and which is known as Moh's scale. It is as follows: (1) Talc, (2) Gypsum, (3) Calcite, (4) Pluorite, (5) Apatite, (6) Feldspar, (7) Quartz, (8) Topaz, (9) Corundum, (10) Diamond. The place which a mineral occupies in this scale is determined by the ease with which it scratches, or...

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...degrees from one to ten, according to the following scale: 1. Talc. 2. Gypsum. 3. Calcite. 4. FluorSpar. 5. Apatite. 6. Feldspar. 7. Quartz. 8. Topaz. 9. Corundum. 10. Diamond. By comparison with this standard the hardness of any mineral may be ascertained. The color of the scratch...