Aplite

горное дело аплит (мелкозернистая магматическая горная порода)

Англо-русский научно-технический словарь

Aplite

noun Etymology: probably from German Aplit, from Greek haploos simple — more at hapl- a fine-grained light-colored granite consisting almost entirely of quartz and feldspar • aplitic adjective

Merriam-Webster's Collegiate Dictionary