Magnetite
mineral · common
Quick facts
- Formula
- Fe3O4
- Hardness
- 5.5–6.5
- Luster
- Metallic
- Colors
- Black
Strongly magnetic iron oxide. Common in igneous and metamorphic rocks and as black beach sand.
A cheap magnet is more reliable than a photo.
Scan yours
Photograph your specimen on arockid.com or in RockSnap / RockID. Three free IDs a day — no card.
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On the App Store, search RockSnap. Links go live when Apple and Google approve the listing. Use the web app today — same account.