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Georgerobinsonite is a rare lead chromate fluoride mineral characterized by its striking orange-red color and adamantine luster. It typically forms thin, tabular crystals in highly oxidized zones of lead-bearing mineral deposits and is a prized target for advanced micro-mineral collectors.

Hardness
2
Mohs
Luster
Adamantine
Streak
Orange
Transparency
Transparent

Is this georgerobinsonite?

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 georgerobinsonite with a known reference. Georgerobinsonite sits at Mohs 2 — softer than the next harder reference, harder than the previous one.
  • 2
    Check the streak
    Drag the specimen across an unglazed porcelain plate. Georgerobinsonite leaves a orange streak.
  • 3
    Read the luster
    Hold the specimen under a strong light. Georgerobinsonite typically shows a adamantine luster.
  • 4
    Match the color range
    Compare against the expected color range: red, orange-red.
  • 5
    Look at form & habit
    Crystal system: monoclinic. Typical habit: tabular crystals.

Often confused with

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

Crocoite mineral
mineral
Crocoite
Mohs 2.5-3

How to tell apart: Streak differs — Georgerobinsonite leaves orange, Crocoite leaves orange-yellow.

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Often found alongside georgerobinsonite

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

All properties

Chemical formula
Pb₄(CrO₄)₂F₂O
Mohs hardness
2
Density
4.57 g/cm³
Colors
RedOrange-red
Streak
Orange
Luster
Adamantine
Transparency
Transparent
Crystal system
Monoclinic
Crystal habit
Tabular Crystals
Cleavage
None
Rarity
Rare
Uses
Collector
Host rock
Oxidized Lead Ore Zones
Typical price
$200-2000+ per specimen depending on size and quality

Where rockhounds find georgerobinsonite

Classic worldwide localities

  • Republic Mine, Washington, USA

Field-hunting tip

Look in oxidized lead ore zones country — that is the host setting where georgerobinsonite typically forms. If you start seeing cerussite, galena, leadhillite 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 georgerobinsonite?+
Mohs hardness is 2. It typically shows a adamantine luster. The streak is orange. Common colors include red, orange-red.
Where is georgerobinsonite found?+
Notable localities include Republic Mine, Washington, USA.
How much is georgerobinsonite worth?+
Typical asking prices fall in the range of $200-2000+ per specimen depending on size and quality. Quality, size, and provenance can move individual specimens well outside that range.
Is georgerobinsonite safe to handle?+
It contains toxic constituents. Contains lead and chromium; handle with care, avoid creating dust, and wash hands thoroughly after handling. Handle with care, avoid grinding or breathing dust, and store separately.
What rocks look like georgerobinsonite?+
Georgerobinsonite is most often confused with Crocoite. A quick hardness test and a streak check separate the look-alikes faster than color alone.
What minerals are found with georgerobinsonite?+
Georgerobinsonite commonly co-occurs with cerussite, galena, leadhillite, calcite. Spotting any of these in float or country rock is a useful trip signal.
What kind of rock does georgerobinsonite form in?+
Georgerobinsonite typically forms in oxidized lead ore zones. Working float back to the host body is the standard way to chase a fresh occurrence.
What is georgerobinsonite used for?+
Georgerobinsonite is used in collector.

Find georgerobinsonite on the map

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

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