Identify rocks and minerals using a step-by-step decision tree based on observable properties. Filter by color, luster, hardness (Mohs scale), streak, cleavage, crystal system, and rock type (igneous, sedimentary, metamorphic) to narrow down specimens.
Dedicated precious and semi-precious gemstone identification with cut types and valuation.
Identify common fossils by type, era, and preserved organism with geological context.
Log your rock collection with photos, locations found, and identification notes in localStorage.
Equipment checklist and field testing procedures for outdoor rock identification.
US state rocks, minerals, and gemstones with geological maps and collecting locations.
Interactive streak test visualization showing how mineral streaks differ from surface color.
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