These rocks have doleritic, intergranular and poikilitic
texture (Fig 4D).
At Burnt Point, massive, pegmatitic gabbro contains cumulus ortho- and clinopyroxene, and large poikilitic
post-cumulus amphibole and plagioclase.
The Talavera sample shows large anhedral poikilitic
orthopyroxene crystals, leading to a hypidiomorphic subophitic to ophitic texture.
In some thin sections the hornblende is poikilitic
and contains inclusions of quartz.
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).
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.
Occurrence: As a monomineralic veinlet cross-cutting poikilitic
5a), locally reaching 20 cm, and they sometimes have ragged poikilitic
margins containing uniformly distributed inclusions of matrix minerals.
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 pyroxene is intergranular to subophitic, but in some rocks grains of other minerals may be 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.
General appearance: Fine, short prismatic grains (up to 1 mm ) and coarse poikilitic