GraniteIgneous
Coarse pink-and-grey speckle of slowly cooled magma, deep underground.
Tell: Interlocking crystals big enough to see; scratches glass.
Geoscience learning studioRead the story
Read the story
written in stone.
Describe a rock, mineral, fossil or a patch of ground. Geode identifies it, explains how it formed, and turns that into strata diagrams, formation illustrations and short geological-process animations.
Educational estimates only — not mineral prospecting, specimen appraisal, or engineering advice.
Identifications this month0/60
60 left · Fieldkit allowance
Identifications and geological interpretations are educational estimates and may be wrong. Geode is not a licensed geological, geophysical or geotechnical service.
01
Identify
Say what you see — colour, weight, crystal shape, streak, where you found it. Get candidates with confidence and self-tests.
02
Understand
Read the formation story: igneous, sedimentary or metamorphic, the timescale, and the era it belongs to.
03
Visualise
Export a specimen card, a strata cross-section, a formation sequence and a short geological-process animation.
A library that reads like a field guide
Open the full library →
BasaltIgneous
Dark, dense, fine-grained lava that cooled fast at the surface.
Tell: Heavy for its size; may tug a magnet.
LimestoneSedimentary
Pale rock built from ancient sea-floor shells and skeletons.
Tell: Fizzes with a drop of weak acid; often holds fossils.
QuartzMetamorphic
Glassy six-sided crystals grown from silica-rich fluids.
Tell: Hardness 7 — scratches glass and steel.
PyriteMetamorphic
Brassy metallic cubes — the classic 'fool's gold'.
Tell: Greenish-black streak; too hard to be gold.
Amethyst geodeMetamorphic
A gas cavity slowly filled inward with purple quartz points.
Tell: Hollow and light; crystals line an open cavity.
Ammonite fossilBiogenic
The mineralised coiled shell of an extinct sea creature.
Tell: Tight ribbed spiral with internal chamber walls.
Six ways to see what you found
Every reading can become a downloadable visual — from an annotated specimen card to a short animation of the process that made it.
Specimen ID card
Composition, hardness and formation type, annotated on your find.
Geological cross-section
Topsoil down to bedrock, every layer labelled.
Formation sequence
How the rock or landform built up over deep time.
Landform visual
Gorges, volcanoes, karst caves, sea cliffs and glacier valleys.
Earth-art poster
Geode slices and crystal palettes for decorative prints.
Process animation
A 6–10s geological-process clip in 16:9 and 9:16.
Subscribe to keep exploring
Start free, step up when you want images, PDFs and process videos. Pure subscription, monthly allowances, no credit packs.
MonthlyYearly · 20% off
Pebble
Start reading stone
$0forever
5 identifications / month
- Text-based identification and formation story
- 1 specimen ID card per identification
- Distinguishing self-tests (hardness, streak, magnetism)
Most chosen
Fieldkit
For rockhounds and learners
$13/ month
60 identifications / month
- All five image outputs (ID card, cross-section, formation sequence, landform, earth-art)
- Field Notes PDF export
- Upload a photo of your rock or site
- Kid-friendly explanation mode
Bedrock
For creators, teachers and deep explorers
$74/ month
Unlimited identifications
- Everything in Fieldkit
- Geological-process video (6-10s, 16:9 and 9:16)
- High-resolution strata and earth-art poster exports
- Classroom multi-copy exports
- Priority image rendering
Pure subscription — no credit packs, no stored balance. Monthly allowances reset each period and do not roll over. All prices in USD.
Planning a class, a hike or a collection?
Tell us what you want to explore and our team will put together a tailored starting point — a specimen set, a classroom module, or a field-day reading list. Educational content only; we never appraise or trade specimens.
Prefer to talk first? Email support@arageos.shop or call +44 7947430752.