アメリカ自然史博物館のインスタグラム(amnh) - 5月14日 03時46分

Pictured is the quartz display in the Museum's Morgan Memorial Hall of Gems. Color variations of quartz depend on the oxidation state of traces of iron. Amethyst ranges from pale purple to dark violet, while smoky quartz varies from pale brown to almost black. Rose quartz, colored by titanium or manganese, is usually translucent and milky, and citrine, a rare variety, varies from a light golden yellow to orange-yellow.
AMNH/R.Mickens

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