KSIĄŻKI POWIĄZANE ZE SŁOWEM «MICROFELSITIC»
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1
Proceedings of the Boston Society of Natural History
upon the microscopic petrography of the Fortieth Parallel collection, Professor
Zirkel, in describing and illustrating his use of the word microfelsitic, writes almost
the identical words quoted above, remarking expressly that the microfelsitic base
...
2
BOSTON SOCIETY OF NATURAL HISTORY
upon the microscopic petrography of the Fortieth Parallel collection, Professor
Zirkel, in describing and illustrating his use of the word microfelsitic, writes almost
the identical words quoted above, remarking expressly that the microfelsitic base
...
3
Structural and Field Geology: For Students of Pure and ...
The non-differentiated matter or base of the groundmass not infrequently
assumes a microfelsitic or cryptocrystalline character. To the unassisted eye this
substance seems to be quite compact and homogeneous ; but under the
microscope ...
4
Proceedings of the Boston Society of Natural History
By polarized light the base is found to be completely devitrified, giving rise to the
so-called micrOfelsitic base. The flow texture of the rock, followed by its sudden
chilling, probably arose from the magma being SO siliceous. In the subsequent ...
Boston Society of Natural History, 1899
5
Granites and Greenstones: A Series of Tables and Notes for ...
Microfelsitic. This term is applied to a substance which in some respects closely
resembles vitreous matter, but differs from it in being less translucent and in
consisting of hazily-defined scales and fibres. When these are irregularly
disposed the ...
6
The Geographical Journal
Under the microscope it is seen to consist of rounded and broken fragments of
quartz and felspar in a greenish microfelsitic base showing flow-structure and, in
parts, indications of perlitic structure. 3. Boad from Miandab to Sujbulak. Rhyolitic
...
7
Geological Survey Professional Paper
... brought about by alternating streaks of microfelsitic and clear glass (Zirkel
1893), or is even used as 'a general name for banded volcanic rocks' (Kemp
1896). That such can hardly have been the earlier application of the word
appears from ...
8
Geological Survey professional paper
The groundmass varies greatly; in some specimens it is spherulitic, in others
microfelsitic, micro- granular, micropegmatitic, or glassy. It is made up chiefly of
quartz and alkalic feldspar. The associated darker quartz latites differ from those
just ...
Geological Survey (U.S.), Geological Survey (U.S.). Geographic Names Information Management, 1956
9
Cyclic Development of Sedimentary Basins
One of them contains more fragments of the acidic magmatic rocks with
microfelsitic and microhipidiomorphic structures, as well as tuffs (7) or tuffites,
probably of pyroclastic origin. Other sandstones contain many fragments of
magmatic rocks, ...
J.M. Mabesoone, V.H. Neumann, 2005
10
The Cambrian Rocks of Pennsylvania
... micropegmatitic, and microfelsitic gronndmass, the point of ignorance having
been shifted from the felsitic base, macroscopically unresolvable, to the
microfelsitic base, which is microscopically unresolvable.4 On the Continent "
felsite" has ...
Charles Doolittle Walcott, 1896
