sedimentary and metamorphic minerals
Mixed Tumbled Stones (Mostly Agate, Jasper, and Quartz)
Silicon Dioxide (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Multi-colored (red, green, white, brown); Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None/Conchoidal fracture.
- Hardness
- 6
- Color
- Multi-colored (red, green, white, brown)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Multi-colored (red, green, white, brown); Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None/Conchoidal fracture.
Formation & geological history
These are primarily microcrystalline varieties of quartz formed from silica-rich groundwater percolating through cavities in volcanic or sedimentary rocks over millions of years. Tumbled specimens are smoothed artistically in vibrating or rotating barrels.
Uses & applications
Used for jewelry (beads, pendants), decorative home accents, landscaping, crystal healing, and as entry-level collector items.
Geological facts
Jasper is typically opaque due to iron impurities, while Agates are translucent and often show banding. These stones have been used for amulets and tools since Neolithic times.
Field identification & locations
Identify in the field by their waxy luster and ability to scratch glass. They are commonly found in river beds and beaches worldwide where volcanic activity once occurred.
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