mineral
Botryoidal Agate / Chalcedony Geode
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale. Color: Translucent white, gray, and tan. Luster: Waxy to vitreous. Crystal Structure: Hexagonal (cryptocrystalline). Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Translucent white, gray, and tan
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Translucent white, gray, and tan. Luster: Waxy to vitreous. Crystal Structure: Hexagonal (cryptocrystalline). Cleavage: None (conchoidal fracture).
Formation & geological history
Formed via the deposition of silica from groundwater in cavities of igneous or sedimentary rocks. The rounded, grape-like shapes (botryoidal) grow outwards from nucleation points within a void.
Uses & applications
Used primarily for lapidary work, jewelry making (cabochons), and as decorative cabinet specimens for mineral collectors.
Geological facts
The term 'botryoidal' comes from the Greek word 'botrys', meaning a bunch of grapes. These specimens often form the interior lining of geodes or vugs.
Field identification & locations
Identify by the characteristic bubbly or rounded surface texture and waxy luster. Commonly found in volcanic regions or limestone deposits globally.
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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