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hypidiomorphic

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hypidiomorphic [hī‚pid·ē·ō′mȯr·fik]
(petrology)
Of the texture of igneous rocks, having the crystals bounded partly by the crystal faces characteristic of the mineral species. Also known as hypautomorphic; subidiomorphic.


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In thin section, large perthitic K-feldspar megacrysts are in a hypidiomorphic granular matrix of normal to oscillatory zoned oligoclase, perthitic orthoclase-microcline, quartz, dark brown to orange-brown biotite, pinitized cordierite, and minor muscovite.
Texture is typically hypidiomorphic equigranular and, locally, inequigranular to porphyritic, especially near the margins as described above.
The rocks are typically fine to medium grained with hypidiomorphic granular to locally ophitic texture involving amphibole and plagioclase (Fig.
 
 
 
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