Google Lens can help you find possible names for a rock, but a visual match is only a starting point. Its results can include similar images, related websites and AI Overviews, as Google’s image-search guide explains. A photo cannot tell you how easily a specimen scratches, so similar-looking minerals may need a closer check. If you’re holding an unknown stone, use the suggested name to decide what to examine next.
How to use Google Lens for a rock on iPhone
Start with one specimen in focus against a plain background. If glare or blur hides its surface, our rock photography guide shows how to get a clearer image.
- Open the Google app and tap the Lens icon in the search bar.
- Take a photo or choose one from your photo library.
- Adjust the selection box around the specimen. For a particular crystal in a larger rock, select that area.
- Read the results and open the linked pages. In the Google app, you can also add text to refine the search.
These steps follow Google’s iPhone instructions. Keep a note of the suggested names, then compare their descriptions with the object in your hand. Check whether a result describes the whole rock or just one mineral within it.
What to check before accepting a name
Suppose your results suggest both quartz and calcite. Either can have a glassy luster, so a shiny photograph may leave you uncertain. The University of Minnesota’s calcite reference explains two useful differences: quartz is much harder, and it lacks calcite’s cleavage, the tendency to break along particular planes.
Our quartz vs. calcite guide helps you compare those properties with your specimen. You can leave the name undecided while you gather more evidence, and note what you can see and what you still need to check. For example: “Clear crystal, flat surfaces; hardness not tested.”
Start by looking at existing surfaces. Before attempting a scratch test, read how to interpret Mohs hardness, including misleading marks and unsuitable specimens. Skip destructive tests on jewelry, valuable pieces or anything you want to preserve. A photo-based suggestion, including one from RockLens, is not an appraisal or a certificate of identity.
When a dedicated rock identifier helps
In the RockLens rock identifier app for iPhone, you can compare three likely identifications alongside their properties and see which details fit. Its suggested home checks help you decide which property to examine next; choose a test that suits your specimen. You can also save photos and notes in your collection to revisit an identification later.
The first 3 scans are free in total. Full results for additional scans require Premium, as do scans with multiple photos.
RockLens can make mistakes too. Use the candidates as leads, and keep the identification tentative when observations disagree.