Migmatite is a composite rock formed under high-grade metamorphic conditions where partial melting occurs, creating distinct layers of light-colored granitic material and dark metamorphic rock. It displays a characteristic swirling or banded appearance known as migmatitic structure, often seen in high-grade regional metamorphic terrains. Collectors usually look for decorative polished slabs that highlight the complex interplay of light and dark mineral veins.

Hardness

5-7

Mohs

Luster

Vitreous

Transparency

Opaque

metamorphiccommon

Migmatite

Hardness: 5-7
Luster: Vitreous
Transparency: Opaque

Is this migmatite?

4-step field check

Run through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.

1
Test the hardness
Try to scratch migmatite with a known reference. Migmatite sits at Mohs 5-7 — softer than the next harder reference, harder than the previous one.
2
Read the luster
Hold the specimen under a strong light. Migmatite typically shows a vitreous luster.
3
Match the color range
Compare against the expected color range: black, white, gray, pink.
4
Look at form & habit
Typical habit: massive.

Often confused with

Migmatite vs. its common look-alikes — and how to tell them apart in the field.

Often found alongside migmatite

Minerals reported to co-occur with migmatite. Spotting these in float or country rock is a strong cue you are in the right ground.

All properties

Mohs hardness: 5-7
Density: 2.6-2.9 g/cm³
Colors: Black White Gray Pink
Luster: Vitreous
Transparency: Opaque
Crystal habit: Massive
Cleavage: None
Rarity: Common
Uses: Decorative, Construction, Architectural
Host rock: Deep Crustal Metamorphic Zones
Typical price: $5-50 for hand samples, higher for polished slabs

Where rockhounds find migmatite

Classic worldwide localities

Finland
Canada
Norway
Scotland
United States

Field-hunting tip

Look in deep crustal metamorphic zones country — that is the host setting where migmatite typically forms. If you start seeing quartz, feldspar, biotite in float, you are in the right ground. Field specimens usually show a massive habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify migmatite?+

Mohs hardness is 5-7. It typically shows a vitreous luster. Common colors include black, white, gray, pink.

Where is migmatite found?+

Notable localities include Finland; Canada; Norway; Scotland; United States.

How much is migmatite worth?+

Typical asking prices fall in the range of $5-50 for hand samples, higher for polished slabs. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like migmatite?+

Migmatite is most often confused with Gneiss, Granite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with migmatite?+

Migmatite commonly co-occurs with Quartz, Feldspar, Biotite, Garnet. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does migmatite form in?+

Migmatite typically forms in deep crustal metamorphic zones. Working float back to the host body is the standard way to chase a fresh occurrence.

What is migmatite used for?+

Migmatite is used in decorative, construction, architectural.

Find migmatite on the map

RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.