Cupalite is an extremely rare copper-aluminum intermetallic mineral found primarily in placer deposits. It typically occurs as small, metallic grains with a distinct copper-red color and is often only identifiable through specialized microscopic and chemical analysis.

Hardness

3-3.5

Mohs

Luster

Metallic

Streak

Copper-red

Transparency

Opaque

mineralrare

Cupalite

Hardness: 3-3.5
Luster: Metallic
Streak: Copper-red
Transparency: Opaque

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Is this cupalite?

5-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 cupalite with a known reference. Cupalite sits at Mohs 3-3.5 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Cupalite leaves a copper-red streak.
3
Read the luster
Hold the specimen under a strong light. Cupalite typically shows a metallic luster.
4
Match the color range
Compare against the expected color range: copper-red, reddish-brown.
5
Look at form & habit
Crystal system: tetragonal. Typical habit: grains.

Often confused with

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

Often found alongside cupalite

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

Copper
mineral · Mohs 2.5-3

All properties

Chemical formula: CuAl
Mohs hardness: 3-3.5
Density: 8.8-9.0 g/cm³
Colors: Copper-red Reddish-brown
Streak: Copper-red
Luster: Metallic
Transparency: Opaque
Crystal system: Tetragonal
Crystal habit: Grains
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: Placer Deposits
Typical price: $100-500 per specimen depending on size

Where rockhounds find cupalite

Classic worldwide localities

Russia
Mongolia

Field-hunting tip

Look in placer deposits country — that is the host setting where cupalite typically forms. If you start seeing copper, aluminium, spinellide in float, you are in the right ground. Field specimens usually show a grains habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify cupalite?+

Mohs hardness is 3-3.5. It typically shows a metallic luster. The streak is copper-red. Common colors include copper-red, reddish-brown.

Where is cupalite found?+

Notable localities include Russia; Mongolia.

How much is cupalite worth?+

Typical asking prices fall in the range of $100-500 per specimen depending on size. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like cupalite?+

Cupalite is most often confused with Copper. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with cupalite?+

Cupalite commonly co-occurs with Copper, Aluminium, Spinellide. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does cupalite form in?+

Cupalite typically forms in placer deposits. Working float back to the host body is the standard way to chase a fresh occurrence.

What is cupalite used for?+

Cupalite is used in collector.

Find cupalite on the map

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