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, 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.