mineral
Chalcedony Stalactites
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, white to translucent color, waxy to vitreous luster, microcrystalline quartz structure with no cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, white to translucent color, waxy to vitreous luster, microcrystalline quartz structure with no cleavage.
Formation & geological history
Formed by the deposition of silica-rich groundwater dripping in subterranean cavities and hollows, often in volcanic rock vesicles.
Uses & applications
Used primarily in lapidary arts, ornamental carving, and mineral specimen collecting.
Geological facts
Stalactitic chalcedony cross-sections often reveal concentric rings reflecting periodic mineral deposition cycles over thousands of years.
Field identification & locations
Identify by radial fibrous structure, microcrystalline texture, and hardness exceeding steel; commonly found in hydrothermal veins and geodes worldwide.
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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
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous