Rock Identifier.io

Igneous (cooled from magma), sedimentary (compressed layers of sediment), and metamorphic (transformed by heat and pressure). Granite is igneous, sandstone is sedimentary, marble is metamorphic.

Yes. Rock Identifier is free on iOS and Android. The web tool provides one free scan per day.

High for common specimens like granite, quartz, basalt, and limestone. Lower for heavily weathered, mud-covered, or matrix-embedded surfaces. Some minerals require physical tests a camera cannot perform.

It provides the mineral name and a general value range. Actual value depends on size, quality, rarity, and demand. For gem-grade specimens, consult a gemologist.

A 1-to-10 ranking of scratch resistance. Talc is 1, diamond is 10. If your specimen scratches glass, it is at least Mohs 6.