 It follows: 1, talc; 2, gypsum; 3, calcite; 4, fluorite; 5, apatite; 6, orthoclase; 7, quartz; 8, topaz; 9, corundum; 10, diamond.  Bulletin - Page 329by United States. Bureau of Mines - 1920Full view - About this book
 | James Dwight Dana - 1868 - 884 pages
...The scale of hardness is as follows, crystallized varieties of the minerals mentioned being meant : 1, TALC ; 2, GYPSUM ; 3, CALCITE ; 4, FLUORITE ; 5,...APATITE ; 6, ORTHOCLASE ; 7, QUARTZ ; 8, TOPAZ ; 9, CORUNDUM ; 10, DIAMOND. 3. In crystallized minerals of the Isometric system, the physical characters... | |
 | James Dwight Dana - Mineralogy - 1868 - 896 pages
...The scale of hardness is as follows, crystallized varieties of the minerals mentioned being meant : 1, TALC ; 2, GYPSUM ; 3, CALCITE ; 4, FLUORITE ; 5,...APATITE ; 6, ORTHOCLASE ; 7, QUARTZ ; 8, TOPAZ ; 9, CORUNDUM ; 10, DIAMOND. 3. In crystallized minerals of the Isometric system, the physical characters... | |
 | James Dwight Dana - Mineralogy - 1868 - 936 pages
...The scale of hardness is as follows, crystallized varieties of the minerals mentioned being meant : ],TALC; 2, GYPSUM ; 3, CALCITE ; 4, FLUORITE ; 5,...APATITE ; 6, ORTHOCLASE ; 7, QUARTZ ; 8, TOPAZ ; 9, CORUNDUM ; 10, DIAMOND. 3. In crystallized minerals of the Isometric system, the physical characters... | |
 | English, George L. & Co - Minerals - 1890 - 118 pages
...cents ; 50 specimens, $1.00 ; 100 specimens, $2.50 ; 200 specimens, $6.00. 1 No. 12. Scale of Hardness. 1. Talc; 2. Gypsum; 3. Calcite; 4. Fluorite ; 5. Apatite ; 6. Orthoclase ; 7. Quartz ; 8. Topaz ; 9. Corundum ; 10. Diamond. The foregoing 10 specimens, averaging 1x2 inches, together with a specimen... | |
 | William Otis Crosby - Mineralogy, Determinative - 1895 - 120 pages
...hardness from talc, which is one of the softest of minerals, to diamond, the hardest of all minerals, as follows: 1. Talc; 2. Gypsum; 3. Calcite ; 4. Fluorite...5. Apatite; 6. Orthoclase; 7. Quartz; 8. Topaz; 9. Corundum; 1o. Diamond. Arranged in this order, each member of the scale is harder than {ie, will scratch)... | |
 | William Otis Crosby - Mineralogy, Determinative - 1895 - 120 pages
...talc, which is one of the softest of minerals, to diamond, the hardest of all minerals, as follows: i. Talc; 2. Gypsum; 3. Calcite ; 4. Fluorite ; 5. Apatite; 6. Orthoclase; 7. Quartz; 8. Topaz; 9. Corundum; 10. Diamond. Arranged in this order, each member of the scale is harder than ( ie, will scratch... | |
 | Clay - 1900 - 756 pages
...preceding one in the series, and softer than the succeeding one. The order, beginning with the softest, is: 1 Talc 2 Gypsum 3 Calcite 4 Fluorite 5 Apatite 6 Orthoclase 7 Quartz 8 Topaz D Corundum 10 Diamond If the hardness of the brick is such that it can be scratched by quartz but not... | |
 | George Washington Miller - Mine examination - 1901 - 196 pages
...foregoing, but smaller specimens and in pasteboard trays 14.00 FOURTH PROPERTY. SCALE OF HARDNESS. a. 1, Talc; 2, Gypsum; 3, Calcite; 4, Fluorite; 5, Apatite; 6, Orthoclase; 7, Quartz; 8, Topaz; 9, Corundum; 10, Diamond. With streak plate and file. Tray $ 5.00 b. Same, but smaller specimens, in hard... | |
 | George Washington Miller - Assaying - 1903 - 414 pages
...blocks c. Same as foregoing, but smaller specimens and in pasteboard trays SCALE OF HARDNESS. a. I, Talc ; 2, Gypsum ; 3, Calcite ; 4, Fluorite; 5, Apatite; 6, Orthoclase; 7, Quartz; 8, Topaz; 9, Corundum; 10, Diamond. With streak plate and file. Tray $ b. Same, but smaller specimens, in hard wood... | |
 | New Jersey Geological Survey, New Jersey. State Geologist - Geological surveys - 1904 - 710 pages
...minerals, No. I being the softest and No. 10 the hardest. The series includes the following minerals: 1, Talc; 2, Gypsum; 3, Calcite ; 4, Fluorite ; 5,...Apatite ; 6, Orthoclase ; 7, Quartz ; 8, Topaz ; 9, Corundum ; 10, Diamond. There are several species of feldspar, which vary somewhat in their chemical... | |
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