Pyritized 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. Pyritized ammonite occurs when, during petrification, the ammonite's organic material is replaced with pyrite, or iron disulfide more commonly known as 'fool's gold'. The result is a beautifully preserved and durable ammonite fossil.
Colors
Metallic Yellow/Brassy

Pyritized Ammonite Classification

Common Name

Pyritized Ammonite

Species

Pyrite

Variety

Colors

Metallic Yellow/Brassy

Alternate Names

Gemstone Groups

Key Separations

Appearance

Comments

Pyritized Ammonite Optical Properties

Transparency

Opaque

Refractive Index

1.81-0

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Fluorescence

CCF Reaction

Pleochroism

None

Dispersion

Comments

Pyritized Ammonite Chemistry & Crystallography

Chemical Name

iron sulfide

Chemical Formula

FeS2

Synthesis

Crystal System

NA

Classification

Sulfide

Nature

Natural

Crystallinity

Comments

Pyritized Ammonite Characteristic Physical Properties

Hardness

6-6.5

Streak

Greenish To Brownish Black Streak

Specific Gravity

4.9-5.1 Typical: 5

Toughness

Poor

Inclusions

pyritized ammonite is fossil ammonite that has been replaced by pyrite.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

Luster

Metallic

Stability

Fracture

Conchoidal, Uneven

Cleavage

None

Comments

JTV on Google+
0 Items
My Wish List
Close
Item
Description
Qty.
Price


Estimated Order Total:
0
Total Due Today:
0
Close
Item
Description
Qty.
Price


Page of 1