miarolitic

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miarolitic

[¦mē·ə·rō¦lid·ik]
(petrology)
Of igneous rock, characterized by small irregular cavities into which well-formed crystals of the rock-forming mineral protrude.
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References in periodicals archive ?
The presence of quartz and feldspar ph enocrysts, as well as miarolitic cavities, requires the melt composition (the opposing end of the lever) to lie on the quartz- feldspar boundary line.