The American Journal of Science and ArtsS. Converse, 1888 |
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Page 58
... Magnetite in good octahedral crystals in . to 1 in . in diame- ter occurs in the school district of Nut Plains , town of Guil- ford . The locality has long been known to the inhabitants of the district . It is a ledge of gneiss on the ...
... Magnetite in good octahedral crystals in . to 1 in . in diame- ter occurs in the school district of Nut Plains , town of Guil- ford . The locality has long been known to the inhabitants of the district . It is a ledge of gneiss on the ...
Page 109
... the lava - stream , even to the laths of labradorite , and the cavities showed minute transparent acicu- lar and tabular crystals , besides black octahedrons of magnetite J. D. ' Dana — Metamorphism from Volcanic Conditions . 109.
... the lava - stream , even to the laths of labradorite , and the cavities showed minute transparent acicu- lar and tabular crystals , besides black octahedrons of magnetite J. D. ' Dana — Metamorphism from Volcanic Conditions . 109.
Page 110
lar and tabular crystals , besides black octahedrons of magnetite . The microscopic investigation of Mr. Dana proves that they actually are like the lavas in constitution , and that the crystals are of pyroxene and feldspar as in the ...
lar and tabular crystals , besides black octahedrons of magnetite . The microscopic investigation of Mr. Dana proves that they actually are like the lavas in constitution , and that the crystals are of pyroxene and feldspar as in the ...
Page 209
... magnetite and much colorless olivine in crystals and grains . There are a few porphyritic crystals of olivine and augite , and very abundant microscopic needles of apatite . Seven other specimens of basalt were collected from a large ...
... magnetite and much colorless olivine in crystals and grains . There are a few porphyritic crystals of olivine and augite , and very abundant microscopic needles of apatite . Seven other specimens of basalt were collected from a large ...
Page 210
... magnetite individuals and take part in the general structure of the rock . In the coarser grained varieties the feldspars some- times enclose a number of the augites situated on the outside of the shell , thus demonstrating that the ...
... magnetite individuals and take part in the general structure of the rock . In the coarser grained varieties the feldspars some- times enclose a number of the augites situated on the outside of the shell , thus demonstrating that the ...
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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