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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Foster occurs in miarolitic cavities containing gem-quality fluorite, microcline, phenacite ([Be.
Some would say that the world's most attractive specimens of goethite are the fan-sprays of lustrous, brownish red bladed crystals from miarolitic cavities in the granite of the Pikes Peak batholith, Colorado.
These miarolitic pegmatites were located by drilling on a 50-meter grid pattern over an extensive field, generally to depths of 100 to 150 meters but in some cases to 600 meters, resulting in many hundreds of kilometers of drill core at a cost in the hundreds of millions of dollars.
Miarolitic cavities (1 mm to 2 cm in size) are locally abundant, in which very fine-grained sericite, chlorite, fluorite, and carbonate are present, but arsenopyrite, molybdenite, and other metallic minerals are relatively rare (Sinclair et al.
These miarolitic cavities in the Pikes Peak granite get up to 4.
Very low regional metamorphic grade (chlorite and sub-chlorite), low-pressure contact metamorphism (cordierite-andalusite), and miarolitic cavities in granite batholiths indicate that the study area remained at shallow crustal levels throughout this polydeformational history.
The amazonite crystals occur within clay-filled miarolitic cavities in pegmatites in the Pikes Peak Granite.
Vuggy textures are common in the porphyry due to abundant miarolitic cavities that impart a frothy appearance to the weathered surface.
These minerals were collected from miarolitic pegmatites, hydrothermal veins and greisens associated with the upper portions and first-crystallized parts of the peraluminous Mount Antero Granite, especially within the leucocratic variant of the granite.
In the Tarryall Range, Park County, miarolitic pockets in aplite dikes have long been known for occasionally yielding good topaz, either as loose single crystals or in specimens showing topaz crystals resting on smoky quartz crystal faces.
Also, the granite hosts the miarolitic cavities that have produced the collectible aquamarine, schorl and other interesting minerals.