Crinoidal Fossil Gemstone & Information | Gemopedia by JTV | Gemopedia™

Crinoidal Fossil

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

    CommonName
    Crinoidal Fossil
    Species
    NA
    Variety
    Colors
    Pink, brown, white, and gray
    AlternateNames
    GemstoneGroups
    KeySeparations
    Appeareance
    ClassificationComments
    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 chemistry & crystallography

    ChemicalName
    ChemicalFormula
    Synthesis
    CrystalSystem
    Cubic
    ChemistryClassification
    Rock
    Nature
    Natural
    Crystallinity
    ChemistryComments
  • Crinoidal-fossil optical properties

    Transparency
    Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    Birefringence
    OpticCharacter
    NA
    OpticSign
    PolariscopeReaction
    Fluorescence
    SWUV:
    LWUV:
    CCFReaction
    Pleochroism
    None
  • Crinoidal-fossil characteristic physical properties

    Hardness
    CharacteristicComments
    Streak
    SpecificGravity
    Toughness
    Inclusions
    Luster
    Stability
    Fracture
    Cleavage
    None