Changoite is a rare secondary sulfate mineral typically found as small, colorless to white tabular crystals or crusts in oxidized ore deposits. It is specifically recognized as the zinc-dominant analogue of bloedite and is primarily valued by mineral collectors for its chemical rarity and type locality origin in Chile.

Hardness

2.5

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrareBloedite Group family

Changoite

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

Is this changoite?

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 changoite with a known reference. Changoite 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. Changoite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Changoite typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: colorless, white.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: tabular crystals, crusts.

Often confused with

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

Often found alongside changoite

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

All properties

Chemical formula: Na₂Zn(SO₄)₂·4H₂O
Mohs hardness: 2.5
Density: 3.37 g/cm³
Colors: Colorless White
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Monoclinic
Crystal habit: Tabular Crystals, Crusts
Cleavage: Poor
Rarity: Rare
Uses: Collector
Host rock: Oxidized Hydrothermal Ore Deposits
Typical price: $50-300 per specimen

Where rockhounds find changoite

Classic worldwide localities

Mina El Guanaco, Chile

Field-hunting tip

Look in oxidized hydrothermal ore deposits country, the host setting where changoite typically forms. If you start seeing gypsum, jarosite, anglesite in float, you are in the right ground. Field specimens usually show a tabular crystals, crusts habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify changoite?+

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

Where is changoite found?+

Notable localities include Mina El Guanaco, Chile.

How much is changoite 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.

What rocks look like changoite?+

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

What minerals are found with changoite?+

Changoite commonly co-occurs with Gypsum, Jarosite, Anglesite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does changoite form in?+

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

What is changoite used for?+

Changoite is used in collector.

Find changoite on the map

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