 For convenience all minerals are referred to a scale of hardness of ten units, composed of common or well known minerals, which are as follows: (1) talc; (2) gypsum; (3) calcite; (4) fluorite; (5) apatite; (6) orthoclase; (7) quartz; (8) topaz; (9) sapphire;...  The Basics of Earth Scienceby Robert E. Krebs - 2003 - 342 pagesNo preview available - About this book
 | James Dwight Dana - 1868 - 936 pages
...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 arc the... | |
 | James Dwight Dana - 1868 - 884 pages
...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 are the... | |
 | James Dwight Dana, George Jarvis Brush - 1877 - 994 pages
...follows, crystallized varieties of the minerals mentioned being meant : 1, TALC ; 2, GYPSUM ; 3, CALCITB ; 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 are the... | |
 | Henry Bedinger Cornwall - 1882 - 352 pages
...hardness of minerals will be stated with reference to the following table of Mohs: 1. Talc; 2. Rock Salt ; 3. Calcite ; 4. Fluorite; 5. Apatite; 6. Orthoclase ; 7. Quartz; 8. Topaz; 9. Corundum; 10. Diamond. The minerals for such a scale should be well crystallized. Gypsum is often substituted... | |
 | English, George L. & Co - 1890 - 118 pages
...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 of Honestone... | |
 | Edmund Livingston Fletcher - 1894 - 160 pages
...hardness : ( This means hardness in relation to scratching, not hardness as to breaking?) 1. Talc. 2. Gypsum. 3. Calcite. 4. Fluorite. 5. Apatite. . 6. Orthoclase. 7. Quartz. 8. Topaz. 9. Sapphire. 10. Diamond. The following is often more available : Scratched by the finger-nail. Scratched... | |
 | 1898 - 738 pages
...of hardness of ten units, composed of common or well known minerals, which are as follows: (1) talc; (2) gypsum; (3) calcite; (4) fluorite; (5) apatite; (6) orthoclase; (7) quartz; (8) topaz; (9) sapphire; and (10) diamond. The hardness of any mineral is determined by its ability to scratch the... | |
 | Ernest Robertson Buckley - 1898 - 722 pages
...of hardness of ten units, composed of common or well known minerals, which are as follows: (1) talc; (2) gypsum; (3) calcite; (4) fluorite; (5) apatite; (6) orthoclase; (7) quartz; (8) topaz; (9) sapphire; and (10) diamond. The hardness of any mineral is determined by its ability to scratch the... | |
 | Wisconsin Geological and Natural History Survey - 1898 - 744 pages
...of hardness of ten units, composed of common or well known minerals, which are as follows: (1) talc; (2) gypsum; (3) calcite; (4) fluorite; (5) apatite; (6) orthoclase; (7) quartz; (8) topaz; (9) sapphire; and (10) diamond. The hardness of any mineral is determined by its ability to scratch the... | |
 | Wisconsin Geological and Natural History Survey - 1898 - 830 pages
...of hardness of ten units, composed of common or well known minerals, which are as follows: (1) talc; (2) gypsum; (3) calcite; (4) fluorite; (5) apatite; (6) orthoclase; (7) quartz; (8) topaz; (9) sapphire; and (10) diamond. The hardness of any mineral is determined by its ability to scratch the... | |
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