also: くろすいしょう
noun
black quartz; morion
A dark variety of quartz, often used in jewelry or as a mineral specimen. The term 'morion' is a specific mineralogical name for very dark, almost opaque smoky quartz.
この黒水晶のブレスレットは、落ち着いた輝きが美しい。
This black quartz bracelet has a beautiful, subdued luster.
鉱物標本
They are exhibiting a black quartz crystal as a mineral specimen.