Grape agate features clusters of small, rounded botryoidal formations resembling a bunch of grapes. Grape agate is a variety of chalcedony quartz, prized for its unique growth pattern and deep purple color.
Details:
- Mineral Group: Quartz (SiO₂)
- Material: Natural grape agate
- Size: Approximately 2–3 inches long
- Appearance: Botryoidal clusters with purple to lavender hues, naturally textured surface
- Formation: Forms in volcanic rock cavities where silica-rich fluids slowly crystallize into spherical aggregates
- Physical Properties: Mohs hardness 6.5–7; vitreous luster
- Educational Value: Demonstrates chalcedony formation, botryoidal growth patterns, and silica crystallization processes
These grape agate specimens offer striking examples of natural crystal aggregation and quartz mineralogy.
