mineral

Pink Chalcedony (Agate/Jasper blend)

Silicon Dioxide (SiO₂)

Hardness: 6.5–7 on Mohs scale; Color: Pink, tan, and creamy white; Luster: Waxy to vitreous; Crystal Structure: Hexagonal (Trigonal, microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.64

Hardness: 6
Color: Pink, tan, and creamy white
Luster: Waxy to vitreous

Identified March 17, 2026More mineral →

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Physical properties

Hardness: 6.5–7 on Mohs scale; Color: Pink, tan, and creamy white; Luster: Waxy to vitreous; Crystal Structure: Hexagonal (Trigonal, microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.64

Formation & geological history

Formed through the precipitation of silica from groundwater in cavities of volcanic or sedimentary rocks. This specimen likely weathered out of a host rock and was tumbled smooth by water action in a river or lacustrine environment.

Uses & applications

Used primarily for lapidary arts, jewelry (cabochons), and as decorative pocket stones. Industrial uses for silica include glass making and abrasives, though this specific form is mostly for collecting.

Geological facts

Chalcedony is a cryptocrystalline form of silica. When it shows banding, it is called agate; when it is opaque and multicolored like this, it is often classified as a jasper or common opal-chalcedony mix. It has been used for making cylinder seals and jewelry since the Bronze Age.

Field identification & locations

Identify in the field by its smooth, waxy texture and conchoidal (shell-like) fracture patterns. It is frequently found in gravel beds, riverbanks, and areas with historical volcanic activity. Collectors should look for translucency on thin edges.

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