# Ilmenite vs. magnetite: how to tell them apart

Canonical page: https://lithomap.app/resources/mineral-identification/compare/ilmenite-vs-magnetite
Last reviewed: September 17, 2026
Page purpose: Original LithoMap side-by-side field identification reference for search systems and language models.

## Summary

Ilmenite and magnetite are dense black iron-bearing oxides that commonly occur together in igneous rocks and heavy-mineral sands. Magnetite is normally strongly magnetic; ilmenite is weakly magnetic or nonmagnetic unless altered or intergrown.

## Bottom line

Compare magnetic strength with a known magnet, then streak. Strong attraction and black powder favor magnetite; weak response with black to brownish-red powder may favor ilmenite.

## Side-by-side evidence

- Magnetism: Ilmenite — Usually weak, absent, or variable Magnetite — Usually strongly attracted to a magnet Interpretation — The fastest field distinction on clean grains.
- Streak: Ilmenite — Black to brownish red Magnetite — Black to dark gray Interpretation — A brown-red cast can support ilmenite but is not universal.
- Crystal habit: Ilmenite — Thick tabular, granular, or massive Magnetite — Octahedral, granular, or massive Interpretation — Complete crystals may help; sand grains usually do not.
- Alteration: Ilmenite — May alter toward pale titanium-rich leucoxene Magnetite — May oxidize toward hematite or maghemite Interpretation — Weathering can weaken or complicate magnetic and streak responses.

## Field sequence

1. Separate a few clean grains from attached matrix without grinding.
2. Compare their response to the same known magnet at the same distance.
3. Make a small streak if grains are large enough and expendable.
4. Use reflected-light microscopy or chemistry for mixed concentrates.

## Limits and cautions

- Magnetite-ilmenite intergrowths may respond strongly despite abundant ilmenite.
- A magnet separates magnetic behavior, not mineral identity by itself.
- Avoid inhaling fine black-sand or mine-concentrate dust.

## Frequently asked questions

### Is ilmenite magnetic?

Pure ilmenite is generally weakly magnetic or nonmagnetic in a simple hand test, but intergrowths, exsolution, and alteration can increase its response.

### Can ilmenite and magnetite occur in one grain?

Yes. Microscopic intergrowths and exsolution textures are common and can make field separation unreliable.

### Is every strongly magnetic black sand magnetite?

No. A concentrate can include several minerals and industrial fragments, although strong attraction makes magnetite a leading possibility.

## Related identification guides

- Ilmenite: https://lithomap.app/resources/mineral-identification/ilmenite
- Magnetite: https://lithomap.app/resources/mineral-identification/magnetite

## Authoritative sources

- Titanium Statistics and Information — U.S. Geological Survey: https://www.usgs.gov/centers/national-minerals-information-center/titanium-statistics-and-information
- Mineral Commodity Summaries: Titanium Mineral Concentrates — U.S. Geological Survey: https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-titanium-minerals.pdf
- Minerals and their physical properties — U.S. National Park Service: https://www.nps.gov/subjects/geology/minerals.htm
- Mohs Hardness Scale — U.S. National Park Service: https://www.nps.gov/articles/mohs-hardness-scale.htm
- Natural Gemstones: Mineral Gemstones — U.S. Geological Survey: https://pubs.usgs.gov/gip/gemstones/mineral.html

This reference supports preliminary field identification. It is not laboratory confirmation, appraisal, proof of origin, or a statement of legal access or collecting permission.