poikilitic

Related to poikilitic: ophitic, trachytic, poikiloblastic

poikilitic

[‚pȯi·kə′lid·ik]

(petrology)

Of the texture of an igneous rock, having small crystals of one mineral randomly scattered without common orientation in larger crystals of another mineral.

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References in periodicals archive ?

These rocks have doleritic, intergranular and poikilitic texture (Fig 4D).

Economic geology, petrogeraphy and geochemical dispersion of volcanic rocks in Noorabad ophiolite (Northwest Lorestan, West Iran)

At Burnt Point, massive, pegmatitic gabbro contains cumulus ortho- and clinopyroxene, and large poikilitic post-cumulus amphibole and plagioclase.

Emplacement of the Fogo Island Batholith, Newfoundland

The Talavera sample shows large anhedral poikilitic orthopyroxene crystals, leading to a hypidiomorphic subophitic to ophitic texture.

Mineral chemistry of late Variscan gabbros from central Spain: constraints on crystallisation processes and nature of the parental magmas

In some thin sections the hornblende is poikilitic and contains inclusions of quartz.

Facies and distribution of metamorphic rocks beneath the Muslim Bagh ophiolite (NW Pakistan): tectonic implications

Las Minas Monzodiorite and the Ibague Batholith presents Augite (Figure 3b) as an accessory with less than 2% and commonly enclosed into biotite crystals (Figure 3c) forming poikilitic textures (Figure 3d).

Geocronologia U-Pb LA-ICP-MS y correlacion regional de las rocas intrusivas del Jurasico Medio del Macizo de Garzon, Valle Superior del Magdalena y la Cordillera Central, Sur de Colombia

3) Quartz occurs as cloudy anhedral grains with characteristic weak birefringence, prominent undulose extinction and low relief while muscovite occurs as tiny elongate plates with poikilitic crystals of quartz.

Compositional and petrogenetic features of schistose rocks of Ibadan area, southwestern Nigeria

Occurrence: As a monomineralic veinlet cross-cutting poikilitic nepheline syenite.

Abstracts of new mineral descriptions

5a), locally reaching 20 cm, and they sometimes have ragged poikilitic margins containing uniformly distributed inclusions of matrix minerals.

When and where did hybridization occur? The case of the Monte Capanne pluton, Italy

Finally, there are some rare but interesting boulders consisting of coarse-grained diorite with poikilitic megacrysts of amphibole that grew around leucocratic droplets (Fig.

The Sierra de Cachi (Salta, NW Argentina): geological evidence about a Famatinian retro-arc at mid crustal levels

The pyroxene is intergranular to subophitic, but in some rocks grains of other minerals may be poikilitic in habit.

Petrography and major element chemistry of mafic dykes in the Nagar Parkar Igneous Complex, Tharparkar, Sindh

Large, poikilitic hornblende crystals are believed to have formed after this magma (and entrained mafic minerals) was injected into a shallower water-rich environment near the roof of the Greendale Complex.

Atlantic Geoscience Society

General appearance: Fine, short prismatic grains (up to 1 mm ) and coarse poikilitic grains (1.