 | James Dwight Dana - 1854 - 946 ページ
...variety. 1. Quartz; transparent. 8. Topaz i transparent. iv S*n>phire ; cleavable varieties. 10. L)nimond. If the file abrades the mineral under trial with the same ease as У >. 4. and produces an equal depth of abrasion with the same force, its hardness is said to he 4.... | |
 | Josiah P. Cooke, Jr. - 1860 - 754 ページ
...variety. 5. Apatite; transparent variety. 5.5. ScapolUe ; crystalline variety. 6. Felspar (orthoclase) ; white, cleavable variety. 7. Quartz ; transparent....transparent. 9. Sapphire ; cleavable varieties. 10. Diamond. In determining the hardness of a mineral, we draw a file over it with considerable pressure. If the... | |
 | William Elderhorst - 1861 - 206 ページ
...crystalline variety. 5. Apatite ; transparent variety. 5.5. Scapolite ; crystalline variety. C. Orthoclase ; white cleavable variety. 7. Quartz ; transparent....transparent. 9. Sapphire ; cleavable varieties. 10. Diamond. To test the hardness of a mineral we may proceed in two different manners : firstly, by attempting... | |
 | William Elderhorst - 1866 - 200 ページ
...crystalline variety. 5. Apatite ; transparent variety. 5.5. Scapolite ; crystalline variety. 6. Orthoclase; white cleavable variety. 7. Quartz ; transparent....transparent. 9. Sapphire; cleavable varieties. 10. Diamond. To test the hardness of a mineral we may proceed in two different manners: firstly, by attempting to... | |
 | Henry Watts - 1871 - 1128 ページ
...again, the relative hardness of a mineral may be determined by abrading one of its edges with a file. If the file abrades the mineral under trial with the same ease as fluor-spar, and produces au equal depth of abrasion with the same force, the hardness is said to be... | |
 | George Farrer Rodwell - 1873 - 752 ページ
...to Mohr's scale of hardness. This consists of the following minerals : — 6. Feldspar (orthoclase), white cleavable variety. 7. Quartz, transparent. 8. Topaz, transparent. 9. Sapphire, cleavable variety. 10. Diamond. 1. Talc, common laminated light-green variety. 2. Gypsum, a crystallized variety.... | |
 | Josiah Parsons Cooke (Jr.) - 1877 - 764 ページ
...hardness of a mineral, we draw a file over it with considerable pressure. If the file abrades the mineral with the same ease as No. 4, and produces an equal depth of abrasion witli the same force, the hardness is said to be 4 ; if less readily than 4, but more readily than... | |
 | Charles Edward Morrison - 1908 - 356 ページ
...transparent variety. 4. Fluorite, crystalline variety. 5. Apatite, transparent variety. 6. Orthoclase, white cleavable variety. 7. Quartz, transparent. 8. Topaz, transparent. 9. Sapphire, cleavable variety. 10. Diamond. Toughness, or the ability to resist the pounding of the rapid blows from horses'... | |
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If the file abrades the mineral under trial with the same ease as No. 4, and produces an equal... 