Browse all objects from the National Mineral Collection currently viewable online. Sort by mineral, collection, country, or setting.
Photograph of a slice of green and yellow orbicular agate (B5473) from the National Mineral Collection
Photo by Chip Clark
QuartzAll quartz have the same arrangement of silicon and oxygen atoms. Because they grew under different conditions, they exhibit an incredible variety of shapes and colors. Impurities cause the distinctively colored gem varieties: rose quartz (pink); citrine (yellow or gold); amethyst (purple); and smoky quartz (black or brown).
Hover over color tiles above to learn what this object tells us about the history of the Earth
denotes specimens currently on exhibit
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