igneous, sedimentary, and metamorphic
Mixed collection of minerals and rocks (Jasper, Carnelian, Granite, and Quartz)
Silicon Dioxide (SiO2) with varying impurities for silicates and igneous aggregates
Hardness: 6.5–7 (Mohs scale); Colors: Red, brown, white, gray, and green; Luster: Vitreous to waxy; Texture: Fine-grained to phaneritic crystalline.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 (Mohs scale); Colors: Red, brown, white, gray, and green; Luster: Vitreous to waxy; Texture: Fine-grained to phaneritic crystalline.
Formation & geological history
Formed through various processes including volcanic cooling (granite), hydrothermal precipitation (quartz/carnelian), and sedimentary deposition of microcrystalline silica (jasper).
Uses & applications
Decorative stones, jewelry (tumbled pieces), collection specimens, and architectural aggregates.
Geological facts
This collection contains several varieties of Chalcedony, which is a cryptocrystalline form of silica. The red/orange pieces are specifically known as carnelian, colored by iron oxide impurities.
Field identification & locations
Identification involves observing fracture (chonchoidal for the silica/jasper pieces) and grain size. These are common surface findings in gravel beds or river deposits globally.
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