STEM
MohsForge
A mineral-identification lab for ages 9–14: an unknown specimen lands on the bench — run the real tests (hardness, streak, luster, heft, magnet, acid, UV, crystal shape) to narrow it down and name it, the way a museum curator does. On-device; nothing leaves your device.
▶ Play it nowBuilt for sittings of about 20 minutes on the screen. That is our design budget, not a measurement.
Meet your mentor
Every Spark & Anvil app has a friendly mentor character that demonstrates, asks, and patiently scaffolds learning.
Mentored by Cora
#0f766e Characters who teach
Meet the cast
MohsForge's cast each embody one diagnostic test; curator Cora asks “what does the evidence rule out?” before you name a specimen — nobody names a mineral they can't narrow to one.
Cora
the diagnostic key — run the tests in order and let each result cross minerals off the list
Mohs
Hardness — what scratches it? the Mohs scale, from a fingernail to steel
Lumen
Luster & streak — how light plays on it, and the true colour of its powder
Habit
Crystal system & break — the shape it grows in and whether it cleaves or fractures
Fizz
The chemistry — acid fizz for carbonates, the magnet, and the UV glow
What's inside
Learning goal
A mineral-identification lab for ages 9–14: an unknown specimen lands on the bench — run the real tests (hardness, streak, luster, heft, magnet, acid, UV, crystal shape) to narrow it down and name it, the way a museum curator does. On-device; nothing leaves your device.
Mentored by Cora — no data leaves the device.
How MohsForge handles your kid's data
- ✅ All progress, settings, and AI-generated content stays on the device
- ✅ No analytics, no tracking, no third-party SDKs
- ✅ Free — no ads, no in-app purchases
- ✅ No personal information collected from children — in line with COPPA (updated by the 2026 FTC amendments)
- ✅ No chat with strangers — play-together rooms use a short code and preset emotes, never typed messages