miarolitic

As a noun pegmatite

is a coarsely crystalline igneous or plutonic rock composed primarily of feldspar and quartz, normally with muscovite and/or biotite mica. Often contains other minerals, which may be of economic importance. Pegmatite is chemically identical to granite, but has a much coarser crystal structure. Common colors are gray, white, and pink. Pegmatite is quarried for decorative stone and as a source of beryllium, columbium and tantalum when these are present. Gemstones of the quartz/silicate family may also be found in pegmatites.

As an adjective miarolitic is

being or pertaining to a crystal-lined irregular cavity or vug most commonly found in granitic pegmatites.

As adjectives the difference between granitic and miarolitic

is that granitic is of, pertaining to, or containing granite while miarolitic is (mineralogy) being or pertaining to a crystal-lined irregular cavity or vug most commonly found in granitic pegmatites.

As a noun vug

is a small to medium-sized cavity inside rock that may be formed through a variety of processes.

As an adjective miarolitic is

(mineralogy) being or pertaining to a crystal-lined irregular cavity or vug most commonly found in granitic pegmatites.

As a noun cavity

is a hole or hollow depression.

As an adjective miarolitic is

being or pertaining to a crystal-lined irregular cavity or vug most commonly found in granitic pegmatites.

As a proper noun crystal

is .

As an adjective miarolitic is

(mineralogy) being or pertaining to a crystal-lined irregular cavity or vug most commonly found in granitic pegmatites.