mineral
Tumbled Chalcedony Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness 6.5-7 on Mohs scale, translucent to sub-translucent, vitreous to waxy luster, cryptocrystalline structure, shell-like (conchoidal) fracture with no cleavage, light tan to greyish color with subtle mottling.
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Physical properties
Hardness 6.5-7 on Mohs scale, translucent to sub-translucent, vitreous to waxy luster, cryptocrystalline structure, shell-like (conchoidal) fracture with no cleavage, light tan to greyish color with subtle mottling.
Formation & geological history
Formed through precipitation from silica-rich fluids filling cavities and veins in host rocks at low temperatures. Commonly found in sedimentary, volcanic, and metamorphic environments.
Uses & applications
Used in lapidary arts, jewelry making, tumbled stone collections, and ornamental crafts.
Geological facts
Chalcedony is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite. Water-worn beach or river pebbles often achieve a natural polish like this specimen.
Field identification & locations
Identified by its waxy luster, microcrystalline texture, and toughness. Commonly found in riverbeds, lake shores, gravel pits, and coastal beaches around the world.
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Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary