porphyroid

por·phy·roid

P0452300 (pôr′fə-roid′)n. Metamorphic rock having porphyritic texture.

porphyroid

(ˈpɔːfɪˌrɔɪd) adj (Geological Science) (of metamorphic rocks) having a texture characterized by large crystals set in a finer groundmassn (Geological Science) a metamorphic rock having this texture

Porphyroid

enUK

porphyroid

[′pȯr·fə‚rȯid] (petrology) A blastoporphyritic, or sometimes porphyroblastic, metamorphic rock of igneous origin. A feldspathic metasedimentary rock having the appearance of a porphyry.

Porphyroid

(also porphyritoid), a rock formed as a result of the metamorphism of rocks with similar composition, such as diabases, porphyrites, or gangues. Porphyroid is usually composed of feldspar, amphibole, pyroxene relicts, calcite, chlorite, talc, and clay; sometimes it contains quartz and zoisite. As a result of strong cataclasis, porphyroid sometimes takes on a slaty texture.

单词	porphyroid
释义	porphyroid enUK por·phy·roid P0452300 (pôr′fə-roid′)n. Metamorphic rock having porphyritic texture. porphyroid (ˈpɔːfɪˌrɔɪd) adj (Geological Science) (of metamorphic rocks) having a texture characterized by large crystals set in a finer groundmassn (Geological Science) a metamorphic rock having this texture Porphyroid enUK porphyroid [′pȯr·fə‚rȯid] (petrology) A blastoporphyritic, or sometimes porphyroblastic, metamorphic rock of igneous origin. A feldspathic metasedimentary rock having the appearance of a porphyry. Porphyroid (also porphyritoid), a rock formed as a result of the metamorphism of rocks with similar composition, such as diabases, porphyrites, or gangues. Porphyroid is usually composed of feldspar, amphibole, pyroxene relicts, calcite, chlorite, talc, and clay; sometimes it contains quartz and zoisite. As a result of strong cataclasis, porphyroid sometimes takes on a slaty texture.
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