Rayite is an exceptionally rare lead-silver-thallium sulfosalt mineral found almost exclusively in the unique Allchar deposit in North Macedonia. It typically appears as dark, metallic masses associated with other rare thallium-bearing minerals and arsenic sulfides like realgar and orpiment.

Hardness

2.5

Mohs

Luster

Metallic

Streak

Lead-gray

Transparency

Opaque

mineralrare

Rayite

Hardness: 2.5
Luster: Metallic
Streak: Lead-gray
Transparency: Opaque

Is this rayite?

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 rayite with a known reference. Rayite 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: lead-gray.
3
Read the luster
Hold the specimen under a strong light. Luster: metallic.
4
Match the color range
Compare against the expected color range: lead gray, gray.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: granular, tabular.

Often confused with

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

How to tell apart: Streak differs, so Rayite leaves lead-gray, Jamesonite leaves black. grayish.

How to tell apart: Streak differs, so Rayite leaves lead-gray, Bournonite leaves steel-gray to iron-black; luster reads metallic on Rayite and brilliant to dull on Bournonite.

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Often found alongside rayite

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

All properties

Chemical formula: Pb₈Ag₂Tl₂Sb₈S₂₁
Mohs hardness: 2.5
Density: 6.13 g/cm³
Colors: Lead gray Gray
Streak: Lead-gray
Luster: Metallic
Transparency: Opaque
Crystal system: Monoclinic
Crystal habit: Granular, tabular
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: In a Precambrian polymetallic massive-sulfide deposit interbedded with kyanite-graphite schists, diopside-bearing calc-silicates, and meta-cherts

Where rockhounds find rayite

Classic worldwide localities

Rajpura-Dariba polymetallic deposit, Udaipur district, Rajasthan, India (type locality)

Field-hunting tip

Where it forms: In a Precambrian polymetallic massive-sulfide deposit interbedded with kyanite-graphite schists, diopside-bearing calc-silicates, and meta-cherts. If you start seeing galena, meneghinite, owyheeite in float, you are in the right ground. Typical habit: granular, tabular. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify rayite?+

Mohs hardness is 2.5. Luster: metallic. The streak is lead-gray. Common colors include lead gray, gray.

Where is rayite found?+

Notable localities include Rajpura-Dariba polymetallic deposit, Udaipur district, Rajasthan, India (type locality).

Is rayite safe to handle?+

Rayite contains antimony, lead and thallium and calls for real care. Contains lead and thallium, both highly toxic elements. Handle with care, wash hands thoroughly after contact, and avoid creating dust.

What rocks look like rayite?+

Rayite is most often confused with Galena, Jamesonite, Bournonite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with rayite?+

Rayite commonly co-occurs with Galena, Meneghinite, Owyheeite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does rayite form in?+

Where it forms: In a Precambrian polymetallic massive-sulfide deposit interbedded with kyanite-graphite schists, diopside-bearing calc-silicates, and meta-cherts. Working float back to the host body is the standard way to chase a fresh occurrence.

What is rayite used for?+

Rayite is used in collector.

Find rayite on the map

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