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

AI-generated identification · may be incorrect

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

Identified April 12, 2026More igneous, sedimentary, and metamorphic →

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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.