Agate
Rock identifier.What rock is this?
Upload a photo of a rock, pebble or stone for a likely match, then check its grains, layers, crystals and texture. Dig deeper in Snappit's kid-friendly field guide.
What did you find?
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Take a photo
Photograph a clean, dry surface in daylight with a ruler or coin next to it for scale. Show more than one side if you can. Wet surfaces and strong filters change how the rock really looks.
Sandstone
Check the match
Compare the suggested name with what you see in your photo. Then open its field-guide entry for fun facts and look-alikes to rule out.
Collect and keep exploring
Browse the field guide here, or save your finds as collectible cards in the Snappit app. Build collections and learn something new together.
Meet the rocks
Real rock cards from the Snappit field guide, from speckled granite to the pebbles in your kid's pocket. Tap one to look closer.
How to identify a rock from a photo
A beach pebble, a rough garden stone and a polished souvenir can be the same rock in very different forms. Look for grains, layers, holes and exposed crystals. A photo can suggest a rock type, though weathering or polishing may have worn away the features you'd need to get more specific.
What to look at when identifying a rock
Grain size and mixed crystals
Start with the size of the mineral grains you can see. Granite-like rocks show a mosaic of different-colored crystals fitted together, while a nearly even surface may mean a rock made mostly of one mineral, or grains too fine to pick out in the photo. A fresh break shows this best.
Layers, bands and repeating patterns
Look for repeating lines, sheets or color bands. Thin, crumbly layers may point to shale or another sedimentary rock, while bolder light-and-dark bands can be a sign of metamorphic rock like gneiss. The question is whether the pattern runs through the rock or only across a weathered outer skin.
Holes, bubbles and glassy surfaces
Notice pores, pits and shine. Some volcanic rocks are full of gas holes, and volcanic glass looks smooth and almost melted. But holes can also come from weathering, dissolved grains or man-made slag, so a porous or glossy surface narrows the options without proving one answer.
Where you found it versus where it formed
Where you found it matters, but only as context. A beach pebble may have traveled a long way and been rounded beyond easy recognition, and garden gravel is often trucked in from quarries. Solid bedrock in a road cut, cliff or fresh dig usually gives stronger clues than a loose stone in a mixed pile.
Compare real field-guide examples: Agate · Sandstone · Granite
Rock look-alikes worth comparing
- Granite-like mixed grains versus one-mineral rock
A granite-like look means interlocking crystals of several colors or shines, often speckles of pink, white, gray and black. If the whole stone is nearly one color and one texture, think of a rock dominated by one mineral, like quartzite or massive limestone, rather than a mixed crystalline rock.
- Gritty sandstone versus layered shale
Sandstone usually looks gritty because it's built from sand-sized grains; on a broken face, individual grains may catch the light. Shale is much finer and tends to split into thin sheets. A rock can be both layered and sandy, so check grain size first, then see whether it breaks into plates.
- Natural rock versus slag or concrete
Concrete shows bits of gravel held in a cement-like paste; slag can have glassy patches, bubbles or metallic bits. Some volcanic rocks and rocks made of cemented fragments can look like either. Photograph the texture and any embedded man-made pieces, and treat a natural-versus-industrial result as tentative when features overlap.
Why beach pebbles, river stones and polished rocks are trickier
Water and tumbling wear away fresh surfaces and corners, which is why a beach pebble often looks smoother and more uniform than the bedrock it came from. Polishing does the same on purpose, deepening color and shine while hiding the rough texture that separates similar rocks. A rounded stone can still be identified, but a broad rock type is usually easier than an exact name.
Broad clues still help: mixed visible crystals, strong banding, shell fragments, straight veins or a waxy, even surface. An unpolished side or a natural break usually tells you more than another glossy angle of the same face. When you upload, pick the clearest single photo rather than several similar shiny ones.
Black, holey or unusual finds
A black rock with holes usually gets a volcanic guess. Basalt and scoria can hold cavities left by gas, but industrial slag can also be dark, porous and glassy, and weathering can open up holes in other rocks. Look at the whole texture and any fresh, unweathered surface instead of treating one hole as the answer.
Meteorite hopes need extra care. Heavy, metal-rich pieces, a thin dark fusion crust and thumbprint-like dents are what people look for, while bubbly holes usually point away from a meteorite. Ordinary rocks, slag and rusty iron can mimic parts of that look, so a photo result is a first sorting step, not proof of where it came from.
Photo tips for better rock IDs
Show the whole stone first
Photograph one rock on its own in even daylight against a plain background. Include the full shape so rounding, edges and any layering are easy to see.
Find the best texture view
Check the clearest grains, bands, holes or broken edge up close, then upload the single photo that shows those features best.
Cut the glare and fake color
Skip filters, wet shine and deep shadow. On polished stones, include any natural patch, vein or crack instead of only a bright, reflective face.
Rock identification FAQ
Can a beach pebble be identified from a photo?
Sometimes, especially if it still shows visible crystals, strong banding, shell pieces or a distinctive color pattern. Smooth, surf-worn pebbles are harder because rounding wipes out fresh surfaces and fine texture. Expect the most reliable answer at the level of a rock type, not a specific named variety.
Why is garden gravel so hard to identify?
Landscaping gravel often comes from one or more quarries and may have nothing to do with your local geology. The pieces are also small, dusty and worn. You'll get a better comparison from one stone photographed on its own up close than from a pile of mixed fragments.
Is a black rock with holes volcanic?
Not necessarily. Some volcanic rocks, like basalt and scoria, are full of gas holes, but pits can also come from weathering, dissolved grains or industrial melting. Slag can be black, porous and glassy enough to pass for lava, so neither the holes nor the dark color settles it alone.
How can I tell if my rock is a meteorite?
A photo can't confirm it, only a lab can. Real meteorites are usually heavy for their size, often stick to a magnet, and may have a thin dark crust or thumbprint-like dents, but they rarely have bubbly holes. Slag, iron scraps and ordinary rocks mimic that look, so treat a photo result as a first screen, not proof.
Can polished stones still be identified?
Often well enough, yes. Polishing hides grain boundaries and weathered surfaces, but broader features can survive, such as banding, veins, mixed crystals, translucence or an even, sugary texture. Decorative stones are still easier to compare if a less-polished patch is visible.
Can I get the exact rock name from a photo?
Sometimes, but not always. Rocks are made of one or more minerals, and many overlap in color and texture. A clear photo can narrow your stone to types like granite, sandstone, basalt, quartzite, marble or slate, while exact chemistry, origin or a trade name needs more than looks.
Does it matter where I found the rock?
Yes, as a check on the result. A loose stone on a beach, in a river or in garden gravel may have traveled far from where it formed. The match comes from the photo, so use what you know about the spot and the local geology to judge whether the answer fits.
Is there a rock identifier app for kids?
Yes. Snappit – Identify Anything for iPhone and Android identifies rocks, minerals and crystals from a photo, with short facts written for young readers and a kid-friendly field guide to explore. Each find becomes a collectible card with a rarity tier in a private family collection. There are no ads or chat, and it's free to download with free daily IDs and an optional subscription for unlimited snaps.
Further reading
The Snappit appAges 4+ · No ads
A discovery is just the beginning
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Facts for curious families
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