Bandylite is a rare copper borate mineral found almost exclusively in oxidized copper deposits in Chile. It typically forms delicate, tabular sky-blue crystals that are prized by mineral collectors for their vibrant color and scarcity.

Hardness

2.5

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrare

Bandylite

Hardness: 2.5
Luster: Vitreous
Streak: White
Transparency: Transparent

Is this bandylite?

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 bandylite with a known reference. Bandylite sits at Mohs 2.5, softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Bandylite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Bandylite typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: blue, turquoise.
5
Look at form & habit
Crystal system: tetragonal. Typical habit: tabular crystals.

Often confused with

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

mineral

Turquoise

Mohs 5-6

How to tell apart: Turquoise is the harder of the two (Mohs 5-6 vs. 2.5); luster reads vitreous on Bandylite and waxy on Turquoise.

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Often found alongside bandylite

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

All properties

Chemical formula: CuB(OH)₄Cl
Mohs hardness: 2.5
Density: 2.8 g/cm³
Colors: Blue Turquoise
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Tetragonal
Crystal habit: Tabular Crystals
Cleavage: Perfect
Rarity: Rare
Uses: Collector
Host rock: Oxidized Copper Deposits
Typical price: $50-300+ per specimen

Where rockhounds find bandylite

Classic worldwide localities

Chuquicamata, Chile

Field-hunting tip

Look in oxidized copper deposits country, the host setting where bandylite typically forms. If you start seeing atacamite, chrysocolla, antlerite in float, you are in the right ground. Field specimens usually show a tabular crystals habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify bandylite?+

Mohs hardness is 2.5. It typically shows a vitreous luster. The streak is white. Common colors include blue, turquoise.

Where is bandylite found?+

Notable localities include Chuquicamata, Chile.

How much is bandylite worth?+

Typical asking prices fall in the range of $50-300+ per specimen. Quality, size, and provenance can move individual specimens well outside that range.

Is bandylite safe to handle?+

It contains toxic constituents. Contains copper, handle with care and wash hands after contact to prevent ingestion or skin irritation. Handle with care, avoid grinding or breathing dust, and store separately.

What rocks look like bandylite?+

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

What minerals are found with bandylite?+

Bandylite commonly co-occurs with Atacamite, Chrysocolla, Antlerite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does bandylite form in?+

Bandylite typically forms in oxidized copper deposits. Working float back to the host body is the standard way to chase a fresh occurrence.

What is bandylite used for?+

Bandylite is used in collector.

Find bandylite on the map

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