mineral
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Pale blue to lavender-grey; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Monoclinic microcrystalline fiber; Specific Gravity: 2.58-2.64
- Hardness
- 6
- Color
- Pale blue to lavender-grey
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Pale blue to lavender-grey; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Monoclinic microcrystalline fiber; Specific Gravity: 2.58-2.64
Formation & geological history
Formed at relatively low temperatures through the deposition of silica-rich water in volcanic cavities, fissures, and sedimentary rocks. Common in Cenozoic era formations.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and in metaphysical collecting.
Geological facts
In antiquity, it was believed to represent the elements of air and water. Famous deposits in Namibia and Turkey are known for the highest quality uniform blue specimens.
Field identification & locations
Identified by its waxy luster, translucency, and inability to be scratched by a steel knife. Frequently found in agate-rich regions or as nodules in basalt and limestones.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock