native mercury
Technical term in mineralogy for naturally occurring mercury, often found in association with cinnabar.
In this region, native mercury occurs together with cinnabar.
水銀 is the general term for mercury, while 自然水銀 specifically refers to mercury in its native, naturally occurring form.
辰砂 (cinnabar) is a mercury sulfide mineral often found alongside native mercury.
Compound of 自然 (natural) and 水銀 (mercury), directly describing mercury found in its native state.