FIELD NOTES
What to write in a rock location note for better identification
Short answer: Write where the specimen was found, whether it was loose or attached, what surface you photographed, and what material was nearby. Location is supporting evidence, not proof of a rock name.
Why a place name alone is weak evidence
“Found near a river” is a useful start, but it does not tell a later reader whether the stone came from the riverbed, a gravel path, a wall, or a bag of landscaping material. Loose rocks travel. Driveway aggregate, building stone, beach cobbles, and trail fill may have come from somewhere else. Keep the location note specific about the setting, then let the visible features carry the identification.
A useful note describes the specimen before it tries to explain it. This keeps a tentative photo match from changing the memory of what you actually found.
Use this short note format
- Setting: riverbed, beach, trail, garden, road cut, quarry, building stone, or another plain description.
- Position: loose, embedded, attached to an outcrop, or mixed with imported material.
- Nearby material: similar stones, layers, soil, sand, or visible crystals in the surrounding rock.
- Surface: dry, wet, weathered, broken, polished, or freshly exposed.
- Photo context: whether the photo shows the whole specimen, a close surface view, or an existing broken edge.
The result can be a single honest sentence, such as: “Loose, rounded stone from a stream margin; photographed dry; nearby pebbles were varied; the pictured face is weathered.” This is more useful than adding a confident rock name that has not been checked.
Separate weathered outside from fresh-looking inside
Weathering can change colour, texture, and apparent minerals near a surface. USGS explains that alteration can make an exposed outside differ from the cleaner interior of the same rock. If an existing break or unweathered edge is visible, record that it is different; do not assume the outside colour describes the whole specimen.
Do not break a sample solely to improve an app result. If it is safe and lawful to examine a naturally exposed edge, photograph both surfaces and say which one informed the note.
What the note can and cannot do
Context can help rule out an unlikely story. A rounded loose stone gives different clues from a sample still attached to a layered outcrop. It cannot by itself establish mineral composition, hardness, age, or origin. A field note works best alongside a clear photo and the evidence-checking method in our AI rock identification guide.
Use the rock identification tool for a tentative visual match, then keep the location note with the specimen. The combination gives you something useful to compare later, even if the first name turns out to be wrong.
Sources for this method
A location note helps preserve observations. It is not evidence that proves a mineral or rock identification.