mineral

Mixed Polished Gemstones (Tumbled Stones)

Mixed Silicates and Oxides (SiO2, KAlSi3O8, Ca2Al2Be3Si6O22, etc.)

Hardness: 6-7 (Mohs); Color: Multi-colored (purple, green, white, orange, yellow); Luster: Vitreous to waxy; Crystal Structure: Various (mostly Trigonal/Hexagonal/Monoclinic); Cleavage: Mostly none to poor

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

Identified June 24, 2026More mineral →

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Physical properties

Formation & geological history

These are various minerals (Amethyst, Howlite, Agate, Quartz, Jasper, Prehnite) formed through hydrothermal vents, volcanic gas cavities (vugs), or metamorphic processes over millions of years.

Uses & applications

Used primarily for decorative purposes, crystal healing, collection, and as materials for craft jewelry like wire-wrapping.

Geological facts

This assortment includes Amethyst (the purple stone), Howlite (the white stone with grey veins), Carnelian (red-orange), Citrine or Yellow Jasper, and Prehnite (light green with inclusions).

Field identification & locations

Identify by color, transparency, and specific inclusions (like the black tourmaline needles in the green prehnite). These are commonly found in 'gem mining' kits or metaphysical shops.

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

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral