安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- Porphyry (geology) - Wikipedia
Porphyry ( ˈpɔːrfəri POR-fə-ree) is any of various granites or igneous rocks with coarse-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate -rich, generally aphanitic matrix or groundmass
- What Is Porphyry? How Does It Form, and In Which Rocks?
Porphyry (pronounced as POR-fə-ree) describes any intrusive or extrusive igneous texture rock with large-grained crystals embedded in a finer-grain matrix The finer-grained groundmass or matrix can be aphanitic or phaneritic
- Porphyry (geology) - New World Encyclopedia
Porphyry is a variety of igneous rock consisting of large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic [1] matrix or groundmass The larger crystals are called phenocrysts In its traditional, non-geologic use, the term "porphyry" refers to the purple-red form of this stone, valued for its appearance
- PORPHYRY Definition Meaning - Merriam-Webster
The meaning of PORPHYRY is a rock consisting of feldspar crystals embedded in a compact dark red or purple groundmass
- Porphyry Deposits - Geology Science
Porphyry deposits are formed through a combination of geological processes that take place over long periods of time These processes include magmatism, hydrothermal activity, and the interaction of mineral-rich fluids with the surrounding rock
- Porphyry | geological feature | Britannica
(A porphyry is an igneous rock containing conspicuous crystals, called phenocrysts, surrounded by a matrix of finer-grained minerals or glass or both ) In most rocks, both alkali and plagioclase feldspars occur as irregularly shaped grains with only a few or no crystal faces
- Porphyry In Geology and Rock Examples? | Earth Know
A porphyry (plural porphyries) is an igneous rock with large, well-formed mineral grains set in a finer-grained matrix Such rocks have two distinctive crystal sizes: large and small
- Porphyry: Mineral information, data and localities.
The rock name descriptive of the groundmass composition usually precedes the term; e g , diorite porphyry In many cases the main phenocryst minerals precedes the name, e g quartz porphyry or quartz-feldspar porphyry Porphyrite is a mostly obsolete variety with dominant plagioclase phenocrysts
|
|
|