Rock & Mineral Encyclopedia
Explore our comprehensive database of 6,726+ rocks, minerals, crystals, gemstones, and fossils. Learn identification tips, discover physical properties, and understand chemical compositions.
Browse by Category
Minerals
5,084 specimens
Natural inorganic substances with a defined chemical composition and crystalline structure
Igneous
34 specimens
Rocks formed from cooled and solidified magma or lava
Sedimentary
22 specimens
Rocks formed by the accumulation and compression of sediments
Metamorphic
25 specimens
Rocks transformed by heat, pressure, or chemical processes
Fossil
15 specimens
Preserved remains or traces of ancient organisms
Quartz
23 specimens
Silicon dioxide crystals in various colors and formations
Chalcedony
15 specimens
Cryptocrystalline forms of silica including agates and jaspers
Jasper
12 specimens
Opaque variety of chalcedony in various colors and patterns
Agate
6 specimens
Banded variety of chalcedony with distinctive patterns
Opal
5 specimens
Hydrated silica known for play of color and iridescence
Beryl
6 specimens
Beryllium aluminum silicate including emerald and aquamarine
Tourmaline Group
18 specimens
Complex borosilicate minerals in many colors
Garnet Group
7 specimens
Silicate minerals commonly used as gemstones
Zeolite
22 specimens
Microporous aluminosilicate minerals
Featured Gemstones & Minerals
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About Our Rock Encyclopedia
Welcome to the most comprehensive rock and mineral encyclopedia online. Our database contains detailed information on over 6,726 specimens, including minerals, igneous rocks, sedimentary rocks, metamorphic rocks, gemstones, crystals, and fossils.
Each entry includes physical properties (hardness, density, color, streak), chemical composition, identification tips, and high-quality images. Whether you're a geology student, rockhound, or casual collector, our encyclopedia provides the information you need to identify and learn about rocks.
What You'll Find
- Minerals - Over 5,000 mineral specimens with crystal systems and formations
- Igneous Rocks - Volcanic and plutonic rocks formed from magma
- Sedimentary Rocks - Rocks formed from accumulated sediments
- Metamorphic Rocks - Rocks transformed by heat and pressure
- Gemstones - Precious and semi-precious stones
- Fossils - Preserved remains of ancient life
Identify Any Rock in Seconds
Point your camera at any rock, mineral, or crystal and get instant identification with detailed properties. Browse our complete 6,726+ specimen database.
- Instant camera-based rock identification
- Detailed properties and chemical composition
- Offline rockhounding maps near you
