mineral
Chalcedony (Carnelian / Agate pebble)
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness 6.5-7 Mohs; waxy to vitreous luster; translucent with warm orange-yellow backlighting; trigonal/cryptocrystalline; specific gravity ~2.6.
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Physical properties
Hardness 6.5-7 Mohs; waxy to vitreous luster; translucent with warm orange-yellow backlighting; trigonal/cryptocrystalline; specific gravity ~2.6.
Formation & geological history
Formed from silica-rich groundwater precipitating in volcanic vesicles or sedimentary cavities, commonly rounded by river or alluvial transport.
Uses & applications
Widely used in lapidary work, cabochons, carved beads, decorative ornamental objects, and collector specimens.
Geological facts
Commonly forms in basaltic volcanic terrains such as those found throughout the East African Rift system and Ethiopian volcanic plateaus.
Field identification & locations
Identified by strong translucency under backlighting, absence of cleavage, conchoidal fracture, and resistance to scratching by a steel nail.
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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
Granite
Granite (Phaneritic intrusive igneous rock)
igneous