Dozyite is a rare phyllosilicate mineral that is structurally related to both serpentine and chlorite. It is typically found as small, thin, pearly white plates within hydrothermal deposits associated with coal seams.

Hardness

2.5

Mohs

Luster

Pearly

Streak

White

Transparency

Translucent

mineralrareSerpentine Group family

Dozyite

Hardness: 2.5
Luster: Pearly
Streak: White
Transparency: Translucent

No image

Is this dozyite?

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 dozyite with a known reference. Dozyite 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. Streak: white.
3
Read the luster
Hold the specimen under a strong light. Luster: pearly.
4
Match the color range
Compare against the expected color range: colorless, light violet, light green.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: euhedral crystals, platy.

Often confused with

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

mineral

Clinochlore

Mohs 2-2.5

How to tell apart: Streak differs, so Dozyite leaves white, Clinochlore leaves greenish white to white.

How to tell apart: Luster reads pearly on Dozyite and greasy on Serpentine.

Often found alongside dozyite

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

All properties

Chemical formula: Mg₇Al₂(Si₄Al₂)O₁₅(OH)₁₂
Mohs hardness: 2.5
Density: 2.66 g/cm³
Colors: Colorless Light violet Light green
Streak: White
Luster: Pearly
Transparency: Translucent
Crystal system: Monoclinic
Crystal habit: Euhedral crystals, platy
Cleavage: Perfect on {001}
Rarity: Rare
Uses: Collector
Host rock: Altered skarn near a copper-gold-silver ore zone

Where rockhounds find dozyite

Classic worldwide localities

Dozy coal mine, Czech Republic

Field-hunting tip

Where it forms: Altered skarn near a copper-gold-silver ore zone. If you start seeing dolomite, kaolinite, quartz in float, you are in the right ground. Typical habit: euhedral crystals, platy. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify dozyite?+

Mohs hardness is 2.5. Luster: pearly. The streak is white. Common colors include colorless, light violet, light green.

Where is dozyite found?+

Notable localities include Dozy coal mine, Czech Republic.

What rocks look like dozyite?+

Dozyite is most often confused with Clinochlore, Serpentine, Kaolinite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with dozyite?+

Dozyite commonly co-occurs with Dolomite, Kaolinite, Quartz. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does dozyite form in?+

Where it forms: Altered skarn near a copper-gold-silver ore zone. Working float back to the host body is the standard way to chase a fresh occurrence.

What is dozyite used for?+

Dozyite is used in collector.

Find dozyite on the map

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