Pyromorphite | Gemopedia

Pyromorphite is a member of the apatite family of minerals. Faceted stones are very rare and its colors are usually brown, green, orange, yellow, colorless, gray and white. Pyromorphite was named in 1813 from the Greek words for "fire" and "form" because, after being melted, the mineral will take on a crystalline shape upon cooling.
Colors
Brown, Green, Orange, Yellow, Gray, White, Colorless

Pyromorphite Classification

Common Name

Pyromorphite

Species

Pyromorphite

Variety

Colors

Brown, Green, Orange, Yellow, Gray, White, Colorless

Alternate Names

Gemstone Groups

Apatite

Key Separations

OTL RI, appearance and cleavage.

Comments

Pyromorphite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

Over the Limit 2.042-2.059

Birefringence

0.01

Optic Character

Uniaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: strong fire

Comments

Pyromorphite Chemistry & Crystallography

Chemical Name

lead chlorophosphate

Chemical Formula

Pb5(PO4)3Cl

Synthesis

Crystal System

Hexagonal

Classification

Phosphate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Pyromorphite Characteristic Physical Properties

Hardness

3.5-4

Streak

White

Specific Gravity

6.5-7.1

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Subconchoidal

Cleavage

Poor, in one direction

Comments

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