The American Journal of Science and ArtsS. Converse, 1888 - Geology |
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Page iii
... Zircon from North Carolina : Seventh Annual Report of the State Mineralogist of California for the year ending Oct. 1 , 1887 , W. IRELAN : Contributions to the Mineralogy of the Pacific Coast , W. LINDGREN , 73. — Materialien zur ...
... Zircon from North Carolina : Seventh Annual Report of the State Mineralogist of California for the year ending Oct. 1 , 1887 , W. IRELAN : Contributions to the Mineralogy of the Pacific Coast , W. LINDGREN , 73. — Materialien zur ...
Page 73
... Zircon from North Carolina . - The recent demand for zir- conium , for use in the arts , has led to a systematic effort to mine it in large quantities . Once regarded as a rare mineral , it has been found possible to obtain within six ...
... Zircon from North Carolina . - The recent demand for zir- conium , for use in the arts , has led to a systematic effort to mine it in large quantities . Once regarded as a rare mineral , it has been found possible to obtain within six ...
Page 210
... zircon . Each grain is a single individual , with uniform optical orientation through- out its substance . Occasionally two individuals are in juxta- position . But they are never made up of aggregates of small grains , the form which ...
... zircon . Each grain is a single individual , with uniform optical orientation through- out its substance . Occasionally two individuals are in juxta- position . But they are never made up of aggregates of small grains , the form which ...
Page 212
... zircon and an apatite . In only a few instances do the quartz grains possess a con- tinuous shell of augite crystals . Most of the grains are bounded directly by the groundmass of the rock , or have a fragmentary augite shell which is ...
... zircon and an apatite . In only a few instances do the quartz grains possess a con- tinuous shell of augite crystals . Most of the grains are bounded directly by the groundmass of the rock , or have a fragmentary augite shell which is ...
Page 221
... zircon . The quartz is in con- siderable quantity , very much more than the amount of quartz observed in quartz - bearing basalts . The discussion of this diorite is reserved for another paper , which is in process of preparation ...
... zircon . The quartz is in con- siderable quantity , very much more than the amount of quartz observed in quartz - bearing basalts . The discussion of this diorite is reserved for another paper , which is in process of preparation ...
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absorption Acad acid action albite alloys American amount analysis angle appears atoms augite biotite bolometer Botanical Notices Botany carbon cent character chemical Coan color cone crater crinoids crystals curve cycads deposits described determined diameter effect electrical Emmons eruption experiments fact fauna feet feldspar figure fissures Flora Flora Brasiliensis formation fossils Genera genus Geological gneiss heat Hilo Hooker hornblende hydrochloric acid iron Journ Journal Kilauea lava less light limestone magnetite mass measured metal mica miles mineral molecules mountain nearly North observed obtained occur paper pinnules plants plates platinum present prism Proc Prof Professor Puget quartz ratio region Report rocks schist sillimanite Silurian slates slit soil solar solution species specific rotation specimens spectrum staurolite steel stream summit surface Survey Taconic temperature thickness tion vapors viscous wave-lengths xenotime zircon