自し然ぜん水すい銀ぎん

Meanings

1

native mercury

Technical term in mineralogy for naturally occurring mercury, often found in association with cinnabar.

水すい銀ぎん
水銀 is the general term for mercury, while 自然水銀 specifically refers to mercury in its native, naturally occurring form.
辰しん砂しゃ
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.