A Summary of Progress in Petrography. in 1887-1896 |
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... axial ratio 0.9735 : 1 : 0.9254 . The inclination of the à to the axis is 103 ° 37 ' . The plane of the optical axes is perpendicular to the clinopinacoid , and the acute bisectrix , which is positive , is in the obtuse angle ß , and is ...
... axial ratio 0.9735 : 1 : 0.9254 . The inclination of the à to the axis is 103 ° 37 ' . The plane of the optical axes is perpendicular to the clinopinacoid , and the acute bisectrix , which is positive , is in the obtuse angle ß , and is ...
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... axial ratio is I : 1.6437 . Its analysis yielded , - Sb2O 15.42 Sio , 10.88 MnO 64.00 FeO 10.32 The discoverer regards it as silicate of manganese ( Mn , SiO1 ) combined with antimonate of iron ( Fe , Sb2Og ) in the proportions 37 : 10 ...
... axial ratio is I : 1.6437 . Its analysis yielded , - Sb2O 15.42 Sio , 10.88 MnO 64.00 FeO 10.32 The discoverer regards it as silicate of manganese ( Mn , SiO1 ) combined with antimonate of iron ( Fe , Sb2Og ) in the proportions 37 : 10 ...
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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