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。

Milky Quartz

乳白石英

Quartz is silicon dioxide, SiO2. Quartz is abundant in the Earth's crust, being the chemically simplest form of the silicates. All the samples here are displayed in the Smithsonian Museum of Natural History. One of many varieties of quartz is an opaque white variety called milky quartz. The sample at right is about 35 cm wide and is from Mineral Park, Colorado.

石英是二氧化硅，SiO₂。石英在地壳中很丰富，是硅酸盐中化学最简单的形式。此处所有样本均陈列在史密森尼自然历史博物馆。石英的众多品种之一是一种不透明的白色品种，称为乳石英。右边的样本宽约35厘米，来自科罗拉多州的矿物公园。

The above sample is about 15 cm wide and is from Carrara, Toscana, Italy.

上述样本宽约15厘米，产自意大利托斯卡纳的卡拉拉石。

The sample at right is over a meter high.

右边的样本高度超过一米。
Minerals
矿物
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