Fundamental Minerals

Sialic Minerals

Feldspars

Feldspathoids

Quartz

Femic Minerals

Spodumene

Accessory Minerals

Rare Accessory

Alteration Products

Microstructures

Rocks

Jacupiranga complex

Poikilitic Texture

Poikilitic texture refers to crystals, typically phenocrysts, in an igneous rock which contain small grains of other minerals. In igneous rocks poikilitic texture is widely used to determine order of crystallization; if one mineral is enclosed by another then the enclosed grain must have been the first to crystallize. This may sometime be true , but it is certainly not always so. McBirney and Noyes (1979) show that this texture may be originated as a result of differing nucleation and growth rates, so that a single crystal (like pyroxene) nucleate and growth to a large size (low nucleation rate) in contrast to several other minerals (like feldspars) with higher nucleation rate which necessarily remain relatively small and became successively entrapped in the pyroxene.

Devolopment of Ppoikilitic texture by simultaneous growth but different nucleation rates of pyroxene (green) and plagioclase (pale-blue).

In many Poikilitic texture the enclosed crystals are randomly arranged, in other may be concentrated In zone and in some case crystals have a specific crystallographic relationship to the host. One of the best known is the arrangement of plagioclase and mica enclosed in K-feldspar. Most commonly the (010) faces of plagioclase and the (001) faces of mica are aligned parallel to the principal faces of K-feldspar.

Bibliography

• Cox et al. (1979): The Interpretation of Igneous Rocks, George Allen and Unwin, London.
• Howie, R. A., Zussman, J., & Deer, W. (1992). An introduction to the rock-forming minerals (p. 696). Longman.
• Le Maitre, R. W., Streckeisen, A., Zanettin, B., Le Bas, M. J., Bonin, B., Bateman, P., & Lameyre, J. (2002). Igneous rocks. A classification and glossary of terms, 2. Cambridge University Press.
• Middlemost, E. A. (1986). Magmas and magmatic rocks: an introduction to igneous petrology.
• Shelley, D. (1993). Igneous and metamorphic rocks under the microscope: classification, textures, microstructures and mineral preferred-orientations.
• Vernon, R. H. & Clarke, G. L. (2008): Principles of Metamorphic Petrology. Cambridge University Press.

Poikilitic orthoclase with biotite and plagioclase inclusions. XPL image. 10x (Field of view = 2mm)	Poikilitic orthoclase with biotite and plagioclase inclusions. XPL image. 10x (Field of view = 2mm)	Poikilitic Amphibole with pyroxene inclusions. PPL image. 10x (Field of view = 2mm)
Poikilitic augite with plagioclase inclusions in a orthocumulate rock. PPL image. 2x (Field of view = 7mm)	Poikilitic augite with plagioclase inclusions in a orthocumulate rock. XPL image. 2x (Field of view = 7mm)	Poikilitic augite with plagioclase inclusions in a orthocumulate rock. PPL image. 2x (Field of view = 7mm)
Poikilitic augite with plagioclase inclusions in a orthocumulate rock. XPL image. 2x (Field of view = 7mm)	Poikilitic augite with plagioclase inclusions in a orthocumulate rock. PPL image. 2x (Field of view = 7mm)	Poikilitic augite with plagioclase inclusions in a orthocumulate rock. XPL image. 2x (Field of view = 7mm)
Poikilitic augite with plagioclase inclusions in a orthocumulate rock. XPL image. 2x (Field of view = 7mm)	Poikilitic augite with plagioclase inclusions in a orthocumulate rock. XPL image. 2x (Field of view = 7mm)	Poikilitic augite with plagioclase inclusions in a orthocumulate rock. XPL image. 2x (Field of view = 7mm)
Poikilitic augite (blue birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite (blue birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite with rounded serpentinized olivine inclusions. Wherlite from Cyprus. PPL image. 1x (Field of view = 9mm)
Poikilitic augite with rounded serpentinized olivine inclusions. Wherlite from Cyprus. PPL image. 2x (Field of view = 7mm)	Poikilitic augite (yellow birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 2x (Field of view = 7mm)	Poikilitic augite (yellow birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 2x (Field of view = 7mm)
Poikilitic augite with rounded serpentinized olivine inclusions (colorless and highly fractured). Wherlite from Cyprus. PPL image. 1x (Field of view = 9mm)	Poikilitic augite (gray birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite (blue-violet birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)
Poikilitic augite (gray birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite (gray birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite with rounded serpentinized olivine inclusions (colorless and highly fractured). Wherlite from Cyprus. PPL image. 1x (Field of view = 9mm)
Poikilitic augite (gray birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite (gray birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite with rounded serpentinized olivine inclusions (beige, pale green due to alterartion). Wherlite from Cyprus. PPL image. 1x (Field of view = 9mm)
Poikilitic augite (gray birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite with rounded serpentinized olivine inclusions (beige, pale green due to alterartion). Wherlite from Cyprus. PPL image. 1x (Field of view = 9mm)	Poikilitic augite (gray birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)
Poikilitic augite (gray birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite (yellow birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite (blue birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)
Poikilitic augite (blue-violet birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite (yellow birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite (yellow birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)
Poikilitic augite (gray birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite (yellow birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite with rounded serpentinized olivine inclusions (colorless and highly fractured). Wherlite from Cyprus. PPL image. 1x (Field of view = 9mm)
Poikilitic augite (blue-violet birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite with rounded serpentinized olivine inclusions (beige, pale green due to alterartion). Wherlite from Cyprus. PPL image. 1x (Field of view = 9mm)	Poikilitic augite (blue-violet birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)
Poikilitic augite with rounded serpentinized olivine inclusions (beige, pale green due to alterartion). Wherlite from Cyprus. PPL image. 1x (Field of view = 9mm)	Poikilitic augite (blue-violet birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)	Poikilitic augite (gray birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 1x (Field of view = 9mm)
Poikilitic augite (gray birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 2x (Field of view = 7mm)	Poikilitic augite (blu-violet birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 2x (Field of view = 7mm)	Poikilitic augite (gray birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 2x (Field of view = 7mm)
Poikilitic augite with rounded serpentinized olivine inclusions. Wherlite from Cyprus. PPL image. 2x (Field of view = 7mm)	Poikilitic augite (yellow birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 2x (Field of view = 7mm)	Poikilitic augite (yellow birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 2x (Field of view = 7mm)
Poikilitic augite with rounded serpentinized olivine inclusions. Wherlite from Cyprus. PPL image. 10x (Field of view = 2mm)	Poikilitic augite (yellow birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 10x (Field of view = 2mm)	Poikilitic augite with rounded serpentinized olivine inclusions. Wherlite from Cyprus. PPL image. 10x (Field of view = 2mm)
Poikilitic augite (yellow birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 10x (Field of view = 2mm)	Poikilitic augite (yellow birefringence) with rounded serpentinized olivine inclusions. Wherlite from Cyprus. XPL image. 10x (Field of view = 2mm)	Poikilitic augite with rounded serpentinized olivine inclusions. Wherlite from Cyprus. PPL image. 10x (Field of view = 2mm)
Poikilitic augite with rounded serpentinized olivine inclusion. Wherlite from Cyprus. XPL image. 10x (Field of view = 2mm)