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porphyry 音标拼音: [p'ɔrfɚi]

n. 斑岩

斑岩

WordNet (r) 3.0 (2006) (WordNet)

porphyry
n 1: any igneous rock with crystals embedded in a finer
groundmass of minerals [synonym: {porphyry}, {porphyritic
rock}]

The Collaborative International Dictionary of English v.0.48 (gcide)

Porphyry \Por"phy*ry\, n.; pl. {Porphyries}. [F. porphyre, L.
porphyrites, fr. Gr. ? like purple, fr. ? purple. See
{Purple}.] (Geol.)
A term used somewhat loosely to designate a rock consisting
of a fine-grained base (usually feldspathic) through which
crystals, as of feldspar or quartz, are disseminated. There
are red, purple, and green varieties, which are highly
esteemed as marbles.
[1913 Webster]

{Porphyry shell} (Zool.), a handsome marine gastropod shell
({Oliva porphyria}), having a dark red or brown polished
surface, marked with light spots, like porphyry.
[1913 Webster]

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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 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 - Igneous Rocks - Sandatlas
Porphyry is an igneous rock characterized by porphyritic texture Porphyritic texture is a very common texture in igneous rocks in which larger crystals (phenocrysts) are embedded in a fine-grained groundmass
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 | 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: 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
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 and epithermal mineral deposits | U. S. Geological Survey
Porphyry and epithermal mineral deposits form large economic ore bodies that provide the global economy with copper, molybdenum, gold, silver and other byproducts (Re, Te, Se)

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