A crystalline mineral, specifically a type of feldspar or other compound with a characteristic arch-like crystal structure.
From Latin 'arcus' (arch) + Greek '-ite' (mineral suffix); this mineralogical term was coined to describe the crystal formation pattern that resembles an arch under magnification.
Mineral names that end in '-ite' tell you it's a mineral, but 'arcite' specifically means this mineral's internal crystal structure looks arched—nature's geometry made visible in stone.
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