Brazilian geodes typically feature a shell of chalcedony lined with beautiful amethyst or colorless quartz crystals. These spherical or irregular rock cavities form within basalt flows and are commonly split to reveal the sparkling interior crystals.

Hardness

Mohs

Luster

Vitreous

Streak

White

Transparency

Translucent

mineralcommonQuartz family

Brazilian Geode

Hardness: 7
Luster: Vitreous
Streak: White
Transparency: Translucent

Is this brazilian geode?

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 brazilian geode with a known reference. Brazilian Geode sits at Mohs 7 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Brazilian Geode leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Brazilian Geode typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: purple, white, clear, gray.
5
Look at form & habit
Crystal system: trigonal. Typical habit: druzy.

Often confused with

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

mineral

Celestite

Mohs 3-3.5

How to tell apart: Brazilian Geode is noticeably harder (Mohs 7 vs. 3-3.5).

How to tell apart: Brazilian Geode is noticeably harder (Mohs 7 vs. 3).

Compare →

Often found alongside brazilian geode

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

All properties

Chemical formula: SiO₂
Mohs hardness: 7
Density: 2.65 g/cm³
Colors: Purple White Clear Gray
Streak: White
Luster: Vitreous
Transparency: Translucent
Crystal system: Trigonal
Crystal habit: Druzy
Cleavage: None
Rarity: Common
Uses: Collector, Decorative, Lapidary
Host rock: Basalt
Typical price: $20-200 depending on size and crystal quality

Where rockhounds find brazilian geode

Classic worldwide localities

Rio Grande do Sul, Brazil
Artigas, Uruguay

Field-hunting tip

Look in basalt country — that is the host setting where brazilian geode typically forms. If you start seeing quartz, calcite, goethite in float, you are in the right ground. Field specimens usually show a druzy habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify brazilian geode?+

Mohs hardness is 7. It typically shows a vitreous luster. The streak is white. Common colors include purple, white, clear, gray.

Where is brazilian geode found?+

Notable localities include Rio Grande do Sul, Brazil; Artigas, Uruguay.

How much is brazilian geode worth?+

Typical asking prices fall in the range of $20-200 depending on size and crystal quality. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like brazilian geode?+

Brazilian Geode is most often confused with Celestite, Calcite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with brazilian geode?+

Brazilian Geode commonly co-occurs with Quartz, Calcite, Goethite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does brazilian geode form in?+

Brazilian Geode typically forms in basalt. Working float back to the host body is the standard way to chase a fresh occurrence.

What is brazilian geode used for?+

Brazilian Geode is used in collector, decorative, lapidary.

Find brazilian geode on the map

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