Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

Obsidian

黑曜石

This rock shows layering of two different kinds of rock, leading to its classification as a metamorphic rock.

这块岩石显示出两种不同类型的岩石层理，因此被归类为变质岩。

This rock is on display in the Smithsonian Museum of Natural History. The source is listed as the Obsidian Cliff, Yellowstone, Wyoming. The sample is 60-70 cm across.

这块岩石陈列在自然历史博物馆中。来源标注为美国怀俄明州黄石的黑曜石崖。样品尺寸为60至70厘米。
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