 | William Otis Crosby - Mineralogy, Determinative - 1887 - 88 pages
...which is one of the softest of minerals, to diamond, the hardest of all minerals, as follows : — 1. Talc. 6. Orthoclase. 2. Gypsum. 7. Quartz. 3. Calcite. 8. Topaz. 4. Fluorite, 9. Corundum. 5. Apatite. 10. Diamond. Arranged in this order, each member of the scale is... | |
 | Harlan Hoge Ballard - Chemistry - 1892 - 280 pages
...hardness is called i, and ending with the hardest known mineral, diamond. The scale is as follows: SCALE OF HARDNESS. 1. Talc. 6. Orthoclase. 2. Gypsum. . 7. Quartz. 3. Calcite. 8. Topaz or beryl. 4. Fluorite. 9. Corundum. 5. Apatite. 10. Diamond. Specimens of the first seven of these... | |
 | Edward Salisbury Dana - Crystallography - 1895 - 402 pages
...are to be taken in each case, that is, a crystal with even surfaces or a smooth cleavage fragment. 1. Talc. 6. Orthoclase. 2. GypSum. 7. Quartz. 3. Calcite. 8. Topaz. 4. Fluorite. 9. Corundum. 5. Apatite. 10. Diamond. When it is said that the hardness of a mineral is 4,... | |
 | Edward Salisbury Dana - Crystallography - 1895 - 420 pages
...are to be taken in each case, that is, a crystal with even surfaces or a smooth cleavage fragment. 1. Talc. 6. Orthoclase. 2. Gypsum. 7. Quartz. 3. Calcite. 8. Topaz. 4. Fluorite. 9. Corundum. 5. Apatite. 10. Diamond. When it is said that the hardness of a mineral is 4,... | |
 | Sir Henry Alexander Miers - Crystallography - 1902 - 636 pages
...mineralogists, as follows : — Mohs' Scale of Hardness 1. Talc. 6. Orthoclase. 2. Gypsum or rock salt. 7. Quartz. 3. Calcite. 8. Topaz. 4. Fluor. 9. Corundum....5. Apatite. 10. Diamond. The hardness of a mineral is estimated by its capability of scratching, or being scratched by, any mineral in the above list.... | |
 | State Geological and Natural History Survey of Connecticut - Botany - 1910 - 980 pages
...follows, those minerals which occur rather abundantly in certain rocks being printed in italics : — 1. Talc 6. Orthoclase 2. Gypsum 7. Quartz 3. Calcite 8. Topaz 4. Fluorite 9. Corundum 5. Apatite 10. Diamond The finger nail has a hardness of about 2.5, and the knife... | |
 | Alfred Broadhead Searle - Clay - 1912 - 502 pages
...Occasionally a shale is found which is hard enough to scratch quartz, but so indurated a clay is rare. MOBS' SCALE OF HARDNESS. 1. Talc. 6. Orthoclase. 2. Gypsum. 7. Quartz. 3. Calcite. 8. Topaz. 4. Fluorspar. 9. Corundum. 5. Apatite. 10. Diamond. When moist, most clays are much softer, and may be... | |
 | Heinrich Ries - Building stones - 1912 - 448 pages
...minerals, ranging from those which are very soft to the hardest ones known. This scale is as follows : 1. Talc. 6. Orthoclase. 2. Gypsum. 7. Quartz. 3. Calcite. 8. Topaz. 4. Fluorite. o. Sapphire. 5. Apatite. 10. Diamond. Any member of the series will scratch any of the others... | |
 | Ewing Paul Brady - 1917 - 346 pages
...those below it, but will in turn be scratched by No. 10. The following is the table of comparative hardness: 1. Talc, 6. Orthoclase, 2. Gypsum, 7. Quartz, 3. Calcite, 8. Topaz, 4. Fluorite, 9. Sapphire, The table of hardness of metals is as follows: Lead, Zinc, Tin, Copper, Aluminum,... | |
 | Ewing Paul Brady - Dental materials - 1917 - 336 pages
...those below it, but will in turn be scratched by No. 10. The following is the table of comparative hardness: 1. Talc, 6. Orthoclase, 2. Gypsum, 7. Quartz, 3. Calcite, 8. Topaz, 4. Fluorite, 9. Sapphire, 5. Apatite, 10. Diamond. Corborundum ranks between No. 9 and No. 10, The table... | |
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... 1. Talc. 6. Orthoclase. 2. GypSum. 7. Quartz. 3. Calcite. 8. Topaz. 4. Fluorite. 9. Corundum. 5. Apatite. 10. Diamond. 
