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Showing: 1 to 10 of 169 matches for "obsidian"  Page   1   2   3   4   5   6   7   8   9  next TITLE Industrial Minerals Derived from Volcanic Rocks in New Zealand  SUMMARY ... volcanic rocks include: amorphous silica, allophane, bentonite, diatomite, ignimbrite building stone, illite clays, halloysite clay, obsidian, perlite, pumice ... AUTHOR T Christie PUBLISHED 2001 TITLE Industrial Minerals - The Mining, Milling, and Processing of Perlite  SUMMARY ... Comparison of these perlite analyses with analyses of obsidian and pitch- stone shows very little difference in composition, the principal difference being in ... AUTHOR Gustafson, Fred D. PUBLISHED 1950 TITLE Precious Stones  SUMMARY ... then obsidian and amber ... He depended mainly on gravels for his gems but his underground operations for turquoise and obsidian were large. ... AUTHOR Ball, Sydney H. PUBLISHED 1949 TITLE The Recognition of Pseudoclastic Textures in Hydrothermally Altered Subaqueous Dyke Rocks and Lavas: Some Economic Implications  SUMMARY ... Massive in situ to clast rotated obsidian hyaloclastite is intruded by highly irregular, cross-cutting dykes, sills and cryptodomes. ... AUTHOR Waters JC PUBLISHED 1995 TITLE The Recognition of Pseudoclastic Textures in Hydrothermally Altered Subaqueous Dyke Rocks and Lavas: Some Economic Implications  SUMMARY ... Massive in situ to clast rotated obsidian hyaloclastite is intruded by highly irregular, cross-cutting dykes, sills and cryptodomes. ... AUTHOR J C Waters PUBLISHED 1995 TITLE Industrial Minerals - Petrographic Techniques in Perlite Evaluation  SUMMARY ... 3) and sometimes it is associated with obsidian nodules, as illustrated in Fig. ... Fig. 4 -Obsidian nodules encased in classical perlite. Fig. ... AUTHOR Kadey, F. L., Jr. PUBLISHED 1963 TITLE Tucker Hill Perlite Deposit, Lake County, Oregon  SUMMARY ... Unfortunately, mining was conduct- ed in a portion of the deposit that contains a high percentage of detrimental marekanite nodules (obsidian). ... AUTHOR Wilson, J. L. ; Emmons, D. L. PUBLISHED 1986 TITLE St. Louis Paper - Analysis of Rocks  SUMMARY ... This, however, is a very difficult matter, and in those rocks which seem to the naked eye &tirely compact,' like obsidian and other rocks of that class ... AUTHOR Egleston, Thomas, Prof. TITLE Analysis of Rocks  SUMMARY ... This, however, is a very difficult matter, and in those rocks which seem to the naked eye &tirely compact,' like obsidian and other rocks of that class ... AUTHOR Egleston, T. Prof. PUBLISHED 1875 TITLE Occurrence And Origin Of Perlite  SUMMARY ... is incomplete, the transition of obsidian to erlit ecan form a distinct zone, - the karekanitic zone - which cornonly exhibits gradational contacts and which ... AUTHOR Breese, R. O. Y. PUBLISHED 1985 Showing: 1 to 10 of 169 matches for "obsidian"  Page   1   2   3   4   5   6   7   8   9  next Search Again