Metamorphic Rock Types

noun a variety of feldspar that is typically pale yellow or green and is often found in hydrothermal veins

• The geologist identified the mineral in the rock sample as adularia.
• I found a cool looking rock with adularia in it.
• Check out this rad rock with adularia in it!
• Her smile was as radiant as the shimmering adularia crystal.

noun a mineral of the pyroxene group consisting of sodium iron silicate

• Aegirine is a mineral that is typically found in igneous rocks.
• I found a beautiful piece of aegirine while hiking in the mountains.
• That aegirine crystal is lit, bro!
• Her eyes sparkled like aegirine in the sunlight.

noun a mineral consisting of a hydrous carbonate of manganese and barium

• The mineralogist identified the rare afwillite specimen in the rock sample.
• I heard that afwillite is a very valuable mineral to collectors.
• Yo, check out this sick afwillite crystal I found on my hike!
• Her kindness was like an afwillite gem, rare and precious in a world of rough stones.