mineral
Chalcedony (Agate / Quartz Pebble)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness 6.5-7 Mohs; waxy to vitreous luster; microcrystalline structure; semi-translucent yellowish-white to faint reddish coloration.
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Physical properties
Hardness 6.5-7 Mohs; waxy to vitreous luster; microcrystalline structure; semi-translucent yellowish-white to faint reddish coloration.
Formation & geological history
Formed through low-temperature precipitation of silica-rich groundwater in cavities, fractures, or vesicles within sedimentary or volcanic rock.
Uses & applications
Used primarily in lapidary work, jewelry, tumbling, decorative carvings, and mineral collecting.
Geological facts
Microcrystalline quartz fibers are often interwoven, giving cryptocrystalline quartz exceptional toughness compared to macroscopic quartz crystals.
Field identification & locations
Identifiable by its smooth, conchoidal fracture, lack of cleavage, translucency, and ability to scratch glass. Found globally in river gravels and volcanic deposits.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Unidentified pink-and-gray mineral or rock specimen
Undetermined; the image is too blurry for reliable identification
mineral