mineral

Pyromorphite

Pyromorphite (Pb5(PO4)3Cl)

Hardness: 3.5-4 (Mohs); Color: Bright green, yellow-green; Luster: Resinous to adamantine; Crystal Structure: Hexagonal (often barrel-shaped or acicular); Specific Gravity: 6.5-7.1

Hardness: 3
Color: Bright green, yellow-green
Luster: Resinous to adamantine

Identified June 7, 2026More mineral →

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Physical properties

Hardness: 3.5-4 (Mohs); Color: Bright green, yellow-green; Luster: Resinous to adamantine; Crystal Structure: Hexagonal (often barrel-shaped or acicular); Specific Gravity: 6.5-7.1

Formation & geological history

A secondary mineral found in the oxidation zones of lead ore deposits. It forms when lead-bearing primary minerals are exposed to phosphorus-rich surface waters.

Uses & applications

Primarily a collector's mineral and lead ore; it is highly prized for its vibrant color and unique crystal habits.

Geological facts

The name comes from the Greek words for 'fire' and 'form,' because when melted into a bead, it recrystallizes into a distinct shape upon cooling.

Field identification & locations

Identify by its characteristic apple-green color, high density (heavy for its size), and hexagonal crystal habits. Commonly found in lead mines in Idaho, China, and France.