Last Updated：2025/11/23
Sentence
地質学者たちは古い鉱山で小さな鉄アンチモン硫化鉱（化学式FeSb2S4）の結晶を見つけ、その鉄灰色の光沢が薄暗い光の中できらめいていた。
Quizzes for review
Geologists found small crystals of berthierite in the old mine, their steel-gray luster shimmering in the dim light.
See correct answer
Geologists found small crystals of berthierite in the old mine, their steel-gray luster shimmering in the dim light.
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