mineral

Lavender Agate / Chalcedony Sphere

Agate (Microcrystalline Quartz) - SiO2

Hardness: 6.5-7 (Mohs); Color: Translucent lavender, cream, and grey banding; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Hardness: 6
Color: Translucent lavender, cream, and grey banding
Luster: Waxy to vitreous

Identified March 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica from groundwater in the cavities (vesicles) of igneous volcanic rocks. This specimen likely originates from the Cenozoic era. The distinct banding occurs as rhythmic crystallization over long periods.

Uses & applications

Primarily used for lapidary arts, metaphysical collecting, interior decoration, and occasionally for high-end jewelry cabochons.

Geological facts

Agate has been used as a gemstone since the Neolithic era; it was famously used in Ancient Egypt for amulets. The specific planetary or 'sphere' shape is achieved through a mechanical process of grinding a rough cube against rotating cups with abrasives.

Field identification & locations

Identify by its characteristic 'banded' appearance, waxy luster when polished, and high hardness (it cannot be scratched by a steel knife). Most specimens on the market today are sourced from Brazil, Madagascar, or Uruguay.

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