A Summary of Progress in Petrography. in 1887-1896 |
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... magnesium and iron , occurring at Edenville , N. Y. , is generally found in prismatic crystals elongated in the direction of the vertical axis , with a cleavage parallel to the clinopinacoid . Lacroix3 has succeeded in ob- taining ...
... magnesium and iron , occurring at Edenville , N. Y. , is generally found in prismatic crystals elongated in the direction of the vertical axis , with a cleavage parallel to the clinopinacoid . Lacroix3 has succeeded in ob- taining ...
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acid alteration Amer American Naturalist analysis yielded andesites apatite augite axial ratio basalts calcite calcium carbonate cent chemical cleavage clinopinacoid composition compounds Comptes Rendus constituents contains corresponding County crystallographic described diabase diallage diopside Edited by Dr eral examined Fe,O feldspar forms formula garnet Geol Geological glass glaucophane gneisses grains granite ground-mass H₂O hemimorphic heulandite hexagonal hornblende inclusions intergrown isomorphous Jour K₂O Kryst Madison magma magnesium magnetite manganese meteoric iron meteorites Mexico mica microscope MINERALOGY AND PETROGRAPHY Mitth mixture monoclinic Na,O Na₂O Neues Jahrb norites olivine origin orthoclase orthorhombic parallel Penfield Petrog PETROGRAPHY plagioclase pleochroic porphyritic porphyritic crystals possess potassium prismatic Professor Genth pseudomorphs pyroxene quartz recently refractive regard result rocks rutile Schefferite schists serpentine silicates SiO2 sodium specific gravity specimens structure substance supposed tion topaz tourmaline twinning plane variety W. S. BAYLEY xxxii Zeits