sedimentary
Mixed River Stones and Minerals
Mixed Silica-rich Stones (Quartz, Agate, Jasper, Sandstone, Dalmation Stone)
Hardness: 6-7 Mohs; Color: Brown, tan, white, red, spotted black and white; Luster: Vitreous to earthy; Texture: Smooth, water-worn, or rough and vesicular.
- Hardness
- 6-7 Mohs
- Color
- Brown, tan, white, red, spotted black and white
- Luster
- Vitreous to earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Brown, tan, white, red, spotted black and white; Luster: Vitreous to earthy; Texture: Smooth, water-worn, or rough and vesicular.
Formation & geological history
These specimens consist of river-tumbled rocks and minerals. The assortment includes sedimentary sandstones, igneous basalt (vesicular), and various forms of metamorphic or hydrothermal silica like quartz and agate, formed through millions of years of erosion and volcanic activity.
Uses & applications
Commonly used for landscaping, aquarium decoration, lapidary tumbling, and educational rock collections.
Geological facts
The collection contains a standout 'Dalmatian Stone' (white with black spots), which is actually an igneous rock composed of feldspar and quartz with spots of arfvedsonite. The smooth river stones achieved their shape through hydraulic action in stream beds.
Field identification & locations
Identify by looking for rounded surfaces indicating water transport (river stones) or specific patterns like the spots on the Dalmatian stone. Found globally in riverbeds, glacial deposits, and beaches.
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