mineral

Assorted Tumbled Gemstones

Mixed oxides and silicates (including Quartz, Chalcedony, and Feldspar variants)

Hardness: 6-7 (Mohs); Color: Multi-colored (purple, green, red, yellow, etc.); Luster: Vitreous to waxy; Structure: Trigeminal and Monoclinic; Cleavage: None or Indistinct.

Hardness: 6-7 (Mohs)
Color: Multi-colored (purple, green, red, yellow, etc
Luster: Vitreous to waxy

Identified June 10, 2026More mineral →

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Physical properties

Hardness: 6-7 (Mohs); Color: Multi-colored (purple, green, red, yellow, etc.); Luster: Vitreous to waxy; Structure: Trigeminal and Monoclinic; Cleavage: None or Indistinct.

Formation & geological history

Formed via various geological processes including igneous crystallization, hydrothermal deposits, and sedimentary mineralization, often aged millions of years.

Uses & applications

Primarily used for jewelry, decorative arts, crystal healing, and as collector starter sets.

Geological facts

This assortment contains common semi-precious stones such as Amethyst, Rose Quartz, Jasper, and Aventurine. These are chemically silica (SiO2) with varying impurities.

Field identification & locations

Identify by color and transparency. Found globally in quartz veins and volcanic rocks. Collectors should look for vibrancy and lack of cracks.

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Biotite Schist

Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]

metamorphic