 | Andrew Ure - 1821 - 418 sider
...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... | |
 | Francis Lieber, Edward Wigglesworth, Thomas Gamaliel Bradford, Henry Vethake - 1831 - 630 sider
...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,... | |
 | Francis Lieber, Edward Wigglesworth, Thomas Gamaliel Bradford - 1831 - 628 sider
...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.... | |
 | sir Richard Phillips - 1835 - 608 sider
...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... | |
 | John Frederic Daniell - 1843 - 810 sider
...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... | |
 | Roswell Park - 1847 - 632 sider
...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... | |
 | La Roy Freese Griffin - 1886 - 326 sider
...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,... | |
 | 1920 - 128 sider
...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... | |
 | S. P. Meads - 1894 - 298 sider
...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... | |
 | Joseph Silas Diller - 1898 - 508 sider
...used in these descriptions, are as follows: Hardness — 1. Talc. 2. Gypsum. 3. Calcite. 4. Fluorite. 5. Apatite. 6. Feldspar. 7. Quartz. 8. Topaz. 9. Corundum. 10. Diamond. Fuitibility. — 1. Stilmite: fusible in the name of a candle in largo fragments ; 2. Natrolite: fusible... | |
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The standard scale, which consists of 10 common minerals arranged in order of increasing hardness, is as follows: 1. Talc 2. Gypsum 3. Calcite 4. Fluorite 5. Apatite 6. Feldspar 7. Quartz 8. Topaz 9. Corundum 10. Diamond By using the above reference minerals,... 
