noun
a rare type of granitic rock containing a high percentage of orthoclase feldspar
adjective
relating to or characteristic of adamellite rock
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The geologist identified the rock as adamellite due to its composition of quartz, feldspar, and biotite.
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I found a cool adamellite rock while hiking in the mountains.
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Check out this shiny adamellite I picked up by the river!
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Her personality was as solid and enduring as adamellite, never wavering in the face of challenges.