Pyromorphite

Pyromorphite

Formula

Pb₅(PO₄)₃Cl 

Crystal System

Hexagonal 

Crystal Habit

Crystals short to long prismatic, acicular, often hoppered terminations, rarely tabular to equant; radiating to branching groups, tapering to a point. Commonly rounded, globular, reniform, botryoidal. 

Cleavage

On {1011}, interrupted 

Luster

Resinous to subadamantine 

Color

Dark grass-green, green, yellow, yellow-orange, reddish orange, yellow-brown, brown, tan, grayish, may be colorless 

Streak

White 

Geological Setting

A secondary mineral in the oxidized zone of lead deposits 

Class

Hexagonal, 6/m - Dipyramidal 

Fracture

Uneven to subconchoidal 

Hardness

3.5–4 

Collection

Arnold G Hampson Collection

Mineralpedia

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On Dakota Matrix

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