Porphyry

• porphyry

  Any igneous rock with crystals embedded in a finer groundmass of minerals.

• groundmass

  (geology) the matrix of fine-grained crystalline material in which larger crystals are...

Also contains

• volcanic rock

  Extrusive igneous rock solidified near or on the surface of the Earth.

• batholith

  Large mass of intrusive igneous rock believed to have solidified deep within the eart...

• peridotite

  A dark coarse-grained igneous rock consisting principally of olivine.

• pegmatite

  A form of igneous rock consisting of extremely coarse granite resulting from the crystallization...

• andesite

  A dark grey volcanic rock.

• sodalite

  A vitreous mineral consisting of sodium aluminum silicate and sodium chloride in crystalline...

• aplite

  Light-colored and fine-grained granitic rock consisting chiefly of quartz and feldspars.

• adesite

  Dark greyish extrusive rock.

• gabbro

  One of a family of granular intrusive rocks.

• diorite

  A granular crystalline intrusive rock.

• rhyolite

  Very acid volcanic rock.