Sedimentary Rock

Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)

Jasper, microcrystalline quartz (SiO₂)

Hardness: 6.5-7 on Mohs scale. Color: Predominantly shades of red, pink, orange, cream, and brown, often with swirling or banded patterns. Luster: Dull to vitreous (glassy). Crystal Structure: Cryptocrystalline (microscopic crystals that are not visible to the naked eye). Cleavage: None. Specific Gravity: 2.58-2.61.

Hardness: 6
Luster: Dull to vitreous (glassy)

Identified September 29, 2025More sedimentary rock →

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Physical properties

Formation & geological history

Cherry Creek Jasper is a form of chert, which is a microcrystalline variety of quartz. It forms through sedimentary processes, typically involving the deposition of silica-rich sediments in ancient shallow marine or lake environments. Over millions of years, these silica-rich sediments compact and lithify, often incorporating other minerals and organic matter that contribute to its distinctive colors and patterns. The material is found in deposits that are typically Mesozoic or Cenozoic in age.

Uses & applications

Cherry Creek Jasper is primarily used in lapidary arts for crafting jewelry (beads, cabochons, pendants), ornamental objects, and decorative carvings. Its appealing colors and patterns make it highly sought after for these purposes. It is also collected by mineral enthusiasts.

Geological facts

The name 'Cherry Creek Jasper' is a trade name, and the material is also known as 'Red Creek Jasper' or 'Cherry Creek Agate' due to its appearance, which can sometimes resemble agate. The vibrant colors and intricate patterns are due to impurities like iron oxides and other trace minerals incorporated during its formation. Despite being called 'Jasper,' some specimens exhibit translucency closer to that of agate.

Field identification & locations

Cherry Creek Jasper can be identified in the field by its distinct reddish, pink, orange, and cream coloration, often with swirled or banded patterns. It typically has a waxy to dull luster and a conchoidal fracture. It is tough and resistant to scratching. The primary source for this material is China, particularly in areas like the Sichuan province, though it is often traded under generic names. When identifying, look for its characteristic patterns and hardness. In its raw form, it may appear as nodular masses or veins within host rock. In polished form, like the beads shown, its beauty is more evident.

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