Identify rocks and minerals like a pro

Explore GeoMiner's free earth-science platform

• Start with this clue: Black & metallic — Check magnetism, streak, heft, and cleavage.
• Start with this clue: Green — Separate common green minerals with safer field clues.
• Start with this clue: White or colourless — Compare hardness, cleavage, lustre, and habit.
• Start with this clue: Red or rusty — Use streak and texture to move beyond surface colour.
• Start with this clue: Glassy texture — Distinguish glassy rocks using fracture and context.
• Start with this clue: Banded or layered — Compare foliation, bedding, grain size, and minerals.
• Start with this clue: Bubbly or full of holes — Screen vesicular volcanic rocks by density and texture.
• Start with this clue: Scratches glass — Confirm a true scratch and narrow harder minerals.
• Photo identification — Get evidence-based rock, mineral, and fossil candidates from photos.
• Quick ID by properties — Narrow a specimen without an account or photo.
• Install the free GeoMiner app — Add GeoMiner to a supported phone, tablet, or desktop without an app-store download.
• All rock, mineral, and geology guides — Search every free field guide, comparison, calculator, printable, and learning resource.
• Geologic look-alike comparisons — Separate commonly confused rocks, minerals, fossils, and manufactured materials.
• Printable rock and mineral identification chart — Use a source-backed field chart online or save a private offline copy.
• Mohs hardness scale and test tool — Estimate a mineral hardness range with safer scratch-test guidance.
• Mineral streak test chart — Interpret common streak colours and separate mineral powder from a scratched plate.
• Mineral cleavage vs fracture chart — Compare cleavage directions, approximate angles, fragment shapes, and fracture types without breaking a specimen.
• Mineral luster and lustre chart — Classify reflected-light appearance safely and carry the bounded observation into Quick ID.
• Mineral color and colour chart — Use colour as a starting clue, compare variable minerals, and continue with stronger evidence.
• Mineral magnetism test chart — Record a magnetic response safely and test magnetite, pyrrhotite, mixture, and meteorite explanations.
• Mineral transparency chart — Compare transparent, translucent, and opaque specimens without confusing transmission and lustre.
• Mineral crystal habit chart — Compare prismatic, equant, tabular, bladed, acicular, fibrous, botryoidal, dendritic, massive, and granular forms.
• Igneous rock identification chart — Classify common intrusive, extrusive, glassy, vesicular, and pyroclastic rocks by texture and composition.
• Sedimentary rock identification chart — Classify common clastic, carbonate, siliceous, evaporite, and organic rocks by grains and composition.
• Metamorphic rock identification chart — Classify common foliated, banded, sheared, and non-foliated rocks by fabric and composition.
• Rock identification quiz — Test texture-first field reasoning across all three rock families with private scoring.
• Mineral identification quiz — Test evidence-led mineral identification across physical properties, look-alikes, and safer field decisions.
• Printable mineral identification worksheet — Record properties, candidates, conflicting evidence, and the safest next test.
• Interactive rock cycle diagram — Follow the processes connecting magma, sediment, and the three main rock groups.
• Specific gravity calculator — Calculate specimen SG privately from air and water measurements or water displacement.
• Reference library — Browse minerals, rocks, tests, safety guides, and geology terms.
• Free geology training — Follow structured lessons and quizzes from fundamentals to field skills.
• Mining and earth-science careers — Compare roles, education pathways, work settings, and skills.
• Classroom mode — Create a free geology classroom or join one with a code.
• Professional field tools — Use drill-core, mapping, sampling, production, and export workflows.
• GeoMiner community — Share finds, compare observations, and learn with other members.
• All free features — See the identification, learning, community, classroom, and field tools in one place.
• GeoMiner for geologists — Explore field workflows, reference material, training, and outreach.
• Schools, teams, and sponsors — Explore free education, team, pilot, and partnership opportunities.
• Partner with GeoMiner — Support measurable, accessible earth-science education and outreach.