noun
Genshō-seki slate; type of slate from Miyagi Prefecture
A specific variety of slate quarried in Miyagi Prefecture, used for traditional roofing, calligraphy inkstones, and other stonework. The term is primarily encountered in geological, architectural, or local cultural contexts.
宮城県産の玄昌石は、屋根材として古くから使われてきた。
Genshō-seki slate from Miyagi Prefecture has been used as roofing material since ancient times.
この硯は玄昌石でできている。
This inkstone is made of Genshō-seki slate.
硯 is an inkstone, often made from slate; 玄昌石 is one type of stone used for making them.
The name 玄昌石 (Genshō-seki) is derived from the place name 玄昌 (Genshō) in Miyagi Prefecture where this slate is quarried, combined with 石 (stone). The exact origin of the place name is uncertain.