pegmatoid


Also found in: Dictionary.

pegmatoid

[′peg·mə‚tȯid]
(petrology)
An igneous rock that has the coarse-grained texture of a pegmatite but that lacks graphic intergrowths or typically granitic composition.
References in periodicals archive ?
The pegmatoid facies shows an equigranular microstructure with subidiomorphic crystals up to 1200 [micro]m (Fig.
Feldspar was analysed in samples from the central facies and the pegmatoid; in the latter, plagioclase is albitised and K-feldspar is also recognised.
The rocks of the chilled margins and the central facies are classified as tephrites, basalts, basaltic andesites and shoshonites whereas the pegmatoid facies includes the most evolved rocks: andesites and dacites (Fig.
The chilled margin and central facies display the lowest REE abundances, whereas the pegmatoid facies presents the highest ones (Table 2).
From the sill margins inwards it shows: chilled margins, central facies and pegmatoid facies.
granite with Ms 1664.80 ODB-1700_85 Bt- schist 1700.85 ODB-1724_75 Ore black shale 1724.75 ODB-1751_05 Grt-Bt schist 1751.05 ODB-1803_80 Bt- schist 1803.80 ODB-1850_85 Bt- schist 1850.85 ODB-1893_80 Mc-Pl, Grt- containing 1893.80 c/g granite ODB-1940_00 Bt-Sill schist 1940.00 ODB-1995_00 Bt- schist 1995.00 ODB-2041_30 Ms-Sill 2041.30 Pegmatoid granite ODB-2105_20 Two-mica Pegm.
A pegmatoid area within texturally and compositionally varied gabbro near the northwestern margin of the Duck Lake Pluton was sampled for dating.
5 Cranberry Head locally highly fractured and Syenogranite albitized; leucocratic; granophyric aplite veins common 6 Dude Lake Pluton local pegmatoid lenses.