Geode Field Guide

Geode Field Guide

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Geode Field Guide
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Field assessment

Geode Field Guide

Upload a rock photo and get a cautious, geology-focused estimate of whether it may contain a cavity or crystal growth.

Important limitation

A surface photo cannot prove what is inside a stone. The app provides an educational field estimate, not a geological certainty.

Photo assessment

Best results come from one clear photo of the whole specimen in natural light, ideally with visible texture, rind, fractures, and scale.

Usually returns in a few seconds after upload
Rock photo

Tip: include a coin, ruler, or hand only if it does not cover diagnostic features.

Optional field notes
Analyze specimen Clear
Select a specimen photo to begin.

Preview

Your selected photo will appear here.

Assessment result

Read the likelihood score together with the evidence, confidence rating, and limitations.

No analysis yet

Upload one specimen photo and run the assessment to see a geology-focused estimate.

Likelihood of cavity or crystals

0%

Model confidence

0%

Most likely specimen type

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Professional summary

Evidence that supports an internal cavity or crystals

    Evidence that argues against it

      Recommended next checks

        Reasons the estimate may be unreliable

          Safety note

          Interpretation boundary

          What a geode usually is

          Many geodes begin as cavities in volcanic or sedimentary settings that later receive silica-rich fluids, depositing chalcedony, quartz, calcite, or amethyst inward from the walls.

          Common false positives

          Rounded concretions, ironstone nodules, weathered basalt, and ordinary fracture-filled rocks can resemble geodes from the outside while lacking a crystal-lined cavity.

          Best non-destructive checks

          Compare mass to size, inspect fresh chips for silica banding, gently tap for resonance, and document locality. Use destructive cutting only when safety and legal context are clear.

          Typical interior minerals

          Quartz and chalcedony are most common, but calcite, amethyst, celestine, barite, and other minerals can line cavities depending on chemistry and host environment.

          Educational use only. Always treat identifications from a single image as provisional.