Pyritised Ammonite | Gemopedia

Ammonites were marine animals that existed during the Jurassic and Cretaceous periods, and are related to modern-day octopi, squid and cuttlefish. The same event that wiped out dinosaurs was the end of this species, as well. Pyritised ammonite occurs when, during pertification, the ammonite's organic material is replaced with pyrite, or iron disulfide more commonly known as fools gold. The result is a beautifully preserved ammonite fossil in a beautiful, more durable mineral.
Colors
Metallic Yellow/Brassy

Pyritised Ammonite Classification

Common Name

Pyritised Ammonite

Species

Pyrite

Variety

Colors

metallic yellow/brassy

Alternate Names

Gemstone Groups

Key Separations

Appearance

Comments

Pyritised Ammonite Optical Properties

Transparency

Opaque

Refractive Index

1.81-0

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Fluorescence

CCF Reaction

Pleochroism

Dispersion

Comments

Pyritised Ammonite Chemistry & Crystallography

Chemical Name

iron sulfide

Chemical Formula

FeS2

Synthesis

Crystal System

Classification

Sulfide

Nature

Natural

Crystallinity

Comments

Pyritised Ammonite Characteristic Physical Properties

Hardness

6-6.5

Streak

greenish to brownish black streak

Specific Gravity

4.9-5.1

Toughness

Poor

Inclusions

pyritised ammonite is fossil ammonite that has been replaced by pyrite. Well preserved specimens show nautilus or spiral like appearance.

Luster

Metallic

Stability

Fracture

Conchoidal To Uneven

Cleavage

None

Comments

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