Crinoidal Fossil | Gemopedia

Crinoidal fossils are pieces of animal skeleton fossils from an estimated 245 -570 million years ago. Crinoids are ancient cousins of starfish, sand dollars, sea urchins and sea cucumbers. Featuring a root-like base, a long stem-like column and then a head that resembles a flower, they look more like plants than animals, and are sometimes referred to as "sea lilies." Crinoids were so abundant that they sometimes formed vast underwater "gardens," leading to the beds of fossils we find today. Completely preserved fossils are rare, as we usually see their skeletons as a conglomeration of fossils.
Colors
Pink, brown, white, and gray

Crinoidal Fossil Classification

Common Name

Crinoidal Fossil

Species

NA

Variety

Colors

Pink, brown, white, and gray

Alternate Names

Gemstone Groups

Key Separations

Appeareance

Comments

Crinoid fossils are marine animals that date back to at least the Ordovician period.Sea lilies are crinoids which are have stalks and feather star or comatulids are crinoids that are unstalked forms. Often found in shale or limestone.

Crinoidal Fossil Optical Properties

Transparency

Opaque

Refractive Index

Birefringence

Optic Character

NA

Optic Sign

Polariscope Reaction

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

None

Dispersion

Comments

Crinoidal Fossil Chemistry & Crystallography

Chemical Name

Chemical Formula

Synthesis

Crystal System

Cubic

Classification

Rock

Nature

Natural

Crystallinity

Comments

Crinoidal Fossil Characteristic Physical Properties

Hardness

Streak

Specific Gravity

Toughness

Inclusions

Luster

Stability

Fracture

Cleavage

None

Comments

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