An Introduction to the Study of Rocks and Guide to the Museum Collection |
Other editions - View all
An Introduction to the Study of Rocks and Guide to the Museum Collection ... L. Fletcher No preview available - 2015 |
An Introduction to the Study of Rocks and Guide to the Museum Collection ... L. Fletcher No preview available - 2018 |
An Introduction to the Study of Rocks and Guide to the Museum Collection (1909) Lazarus Fletcher No preview available - 2008 |
Common terms and phrases
action on transmitted aggregated alkali alteration amorphous andesites arrangement augite basalt biotite breccia cavities characters throughout clay cleavage colour consist contain conveniently cooling crystalline schist crystalline-granular crystallised crystals deposited diorite direction Division dolerite dykes enclosed enclosures essentially felsite felspar felspathic felspathoid fine-grained fissility formation formed fracture fragments further gabbro Gneiss grain granite ground-mass holo-crystalline rock hornblende immediate constituents inferred kinds of rocks lava lava-stream liquid lithical characters matter mero-crystalline mica microscope mineral constituents mineral products modes of origin molten mass natural nepheline obsidian olivine orthoclase particles percentage chemical composition percentage of silica peridotites phenocrysts phonolite planes porphyritic present pressure pyroxene quartz quartz-diorites quartz-porphyries regarded result rhyolite rock-mass rocks belonging sandstone scheme of classification schist Section sedimentary shale silica similarity of characters simple mineral single sodo-calcic felspar sodo-potassic solid solidification sometimes specimens stituents surface syenite tachylyte temperature termed trachyte transmitted polarised light variety viscous vitreous structure volcanic
Popular passages
Page 109 - On a sheet of paper ruled in squares, and which is read as a continuous column from the bottom of one column to the top of the next...
Page 67 - III. Rocks which, though really composed of material not belonging to a single definite mineral species, are so far homogeneous in aspect that the essentiality of the compositeness is concealed from the unaided eye.