noun
adularia; adularia feldspar
A variety of potassium feldspar, typically found in alpine-type fissures and low-temperature hydrothermal veins. Used in geology and mineralogy.
この標本は氷長石の結晶を含んでいる。
This specimen contains crystals of adularia.
正長石 (orthoclase) is a more common potassium feldspar; 氷長石 is a low-temperature variety with a characteristic adularescence.
From 氷 (ice) + 長石 (feldspar), referring to the icy, translucent appearance of adularia crystals.