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Jefferson County Museum

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  1. Jasper - Quartz

    Jasper is an opaque form of Chalcedony, which is a microcrystalline variety of the mineral Quartz. It often contains an abundance of impurities, and therefore some regard it as a rock instead of a mineral. These two rocks were found in Jefferson County Montana.

    Record Type: Object

    Jasper
  2. Jasper and various Agate - Gypsum

    Left three rocks are Jasper which is an opaque rock of virtually any colour stemming from the mineral content of the original sediments or ash. Patterns arise during the consolidation. Jasper is used for ornamentation or as a gemstone. The three rocks on the right are various agate which is almost always translucent (letting through some light when you shine a light on it) and have banding- thin visible layers. Often these bands form concentric r...

    Record Type: Object

    Jasper & Agate

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