Quartz
SiO₂ · Mineral · Silicate
Rock, crystal & gem identifier
Know the rock in your hand.
Take a photo of any rock, crystal, or gem. RockLens names the three most likely matches, shows you simple tests to confirm, and shares typical prices — honestly ranked, never overconfident.
Free to try — your first 3 scans are on us.
Strong match
Quartz
Top 3 — most to least likely
QuartzSiO₂
Strong matchCalciteCaCO₃
PossibleMilky fluoriteCaF₂
UnlikelyTypical retail$5 – $40
Not an appraisal — actual value varies widely.
How it works
From pocket to name in three steps
- 01
Scan a specimen
One photo, or up to three angles for tricky pieces. Good light and a plain background help.
- 02
Meet your top 3
Candidates arrive most to least likely, with plain-spoken confidence — strong match, possible, unlikely. No fake percentages.
- 03
Confirm at home
Simple tests settle it — a glass scratch, a drop of vinegar. Physical tests narrow the field; they're not a lab assay.
Features
Three candidates, honestly ranked
Every scan returns its best three guesses in order, each with a confidence tier you can actually read. Strong means strong — and unlikely says so out loud.
- Ordered most to least likely
- Confidence in words, not invented percentages
- Colors, luster, and form compared for you
Strong match
Calcite
CaCO₃ · Mineral · Carbonate
Milky fluorite
CaF₂ · Mineral · Halide
Features
Settle it on your kitchen table
Each match comes with quick physical tests — scratch glass, try vinegar, check the streak. A minute of kitchen science usually crowns a winner.
- Everyday household items only
- Clear expected results for each test
- Designed to tell lookalikes apart
Scratch a glass plate with the sample.
Scratches glass → harder than 5.5 — likely quartz, not calcite.
Drop vinegar on an inconspicuous spot.
Fizzing bubbles → calcite, not quartz.
Look for hexagonal crystal faces.
A six-sided prism with a pointed end supports quartz.
VinegarGlass plateStreak plateMagnifier
Features
What pieces like yours go for
Typical retail ranges for the species, when reliable data exists. Context for learning — never a valuation of your specific piece.
- Common to exceptional range at a glance
- Market context when we have it
- Honest when data is missing
Agate
SiO₂ · Chalcedony$2
$60
CommonExceptional
Typical retail prices for this species — not an appraisal of your specimen. Actual value varies widely.
Features
A field journal that keeps itself
Every scan lands in your collection — photos, names, tests, and notes, saved on your device. Free forever, no account needed.
- Works fully offline
- Your data stays on your device
- Free forever
- Quartz
- Amethyst
- Agate
- Calcite
- Pyrite
- Fluorite
Honest by design
Confidence you can trust
Top 3, honestly ranked
We show the most likely matches with home tests to confirm — never fake certainty.
Junk scans don't count
Pointed at your shoe by accident? That doesn't look like a rock — and it won't use a scan.
Prices educate, never appraise
We share typical retail ranges when reliable data exists. Not an appraisal of your specimen.
FAQ
Fair questions, straight answers
Every answer comes as three ranked candidates with home tests to confirm — so even when the top pick is off, the right name is usually on the list. RockLens is tuned against a labeled set of real specimens before release.
Scans are saved and identify automatically when you're back online. Your collection lives on your device either way.
Three full scans to start, and a collection journal that is free forever. Subscriptions unlock unlimited scans.
Photos are uploaded for identification only — never for tracking or ads. The privacy policy spells it out in plain language.
No — and be wary of apps that claim to. RockLens shares typical retail ranges for the species to help you learn, never an appraisal of your specific piece.
Yes — RockLens is built for iPhone, with iOS 17 or later.
Start your field guide.
Three scans on us — and your collection is free forever.