mineral

Mixed Mineral and Rock Collection

Mixed geological specimens (Quartz, Amethyst, Rose Quartz, Jasper, Epidote, Chert)

Hardness: 3 to 7 on Mohs scale depending on the piece; Colors: Yellow, pink, purple, green, white, reddish-brown, grey, black; Luster: Vitreous, dull, greasy, and earthy; Structures: Hexagonal, massive, cryptocrystalline, coarse-grained.

Hardness: 3 to 7 on Mohs scale depending on the piece
Luster: Vitreous, dull, greasy, and earthy

Identified July 22, 2026More mineral →

Explore Mixed Mineral and Rock Collection in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed through various geological processes including igneous crystallization, hydrothermal vein deposition, and sedimentary precipitation in diverse global geological environments.

Uses & applications

Rockhounding collections, educational identification sets, lapidary cabochon cutting, tumbling, and decorative gemstone displays.

Geological facts

This collection contains several notable varieties including purple amethyst crystals, soft pink rose quartz, banded chert/agate, yellowish sulfur-bearing or epidote minerals, and iron-stained quartz nodules.

Field identification & locations

Look for crystal faces, cleavage, color patterns, and scratch hardness to separate quartz varieties (H=7) from softer green or yellow minerals (H=3-6).

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Sandstone with Mineral Veining or Crust

Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)

sedimentary

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

mineral

Gypsum (variety Selenite or Alabaster)

Calcium sulfate dihydrate (CaSO4·2H2O)

Mineral

Nephrite Jade

Nephrite

Mineral/Rock