Download - typ e of igneous Rocks
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Hypocrystalline crystals + glass
glassPlane light
X polarized light
Holocrystalline 100% crystals
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0 5 10 mm
Fine-grained (
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1mm
1mm1mm
Equigranular Seriate/Hiatal
Porphyritic
Plagioclase Porphyritic or Plag-phyric
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Subhedral AnhedralEuhedral
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Subpoikilitic PoikililticAmeboidal
Oikocryst Chadacyrst
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Embayed Skeletal
Spinifex DendriticRadial
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Intergranular Subophitic Ophitic
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Intersertal Pyroclastic
glass
olivine
Philip Farquharson, 2004www-odp.tamu.edu/
http://www-odp.tamu.edu/publications/192_IR/chap_03/c3_f45.htmhttp://www-odp.tamu.edu/publications/192_IR/chap_03/c3_f45.htm -
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Foliation alignment of elongate minerals in a common plane
Qualifiers: Non-foliated random orientation of elongate minerals
Poorly foliated less than 50% aligned within 10 of common plane
Moderately foliated 50-75% aligned
Well foliated - > 75% aligned
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Trachytoid alignment in fine-grainedvolcanic rocks
Radiate
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Micrographic/GranophyricSutured Symplectitic
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Corona
Biotite on Oxide Hornblende on Orthopyroxene Clinopyroxene on Olivine
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Rapakivi - Alkali Feldsparmantled by PlagioclaseFeldspar
Peritectic Reaction Rim
Ol+melt = Opx
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Exsolution in
InvertedPigeonite
< Blebby
Lamellar >
Linked Exsolution between Inverted
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Linked Exsolution between InvertedPigeonite (IP) and Augite (Cpx)
IP
IPBio
Feox
Cpx
Perthite Na-plagioclaseexsolved from K-feldspar
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Oxide Needles in Plagioclase
Oxide Exsolution and Epitaxial Biotite
in Augite rimming Olivine
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PlagioclaseSymplectite
Pl>CaPl+Opx
OlivineSymplectite
Ol>Opx+Mt
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Simple Twin (in Cpx)
Polysynthetic Twinning
(Albite Twinning in Pl)
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Textural and Modal Layeringin Gabbro
Flow banding in Rhyolite
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Amygdules in Basalt