Pseudo-fossil (Anthracite Coal Fragment)
Incertae sedis; likely constituent of Lepidodendron or Sigillaria debris transformed into coal • Non-fossilized mineral / Metamorphic Carbon (Plant-derived body fossil equivalent)
Geological Period
Carboniferous (Pennsylvanian sub-period)
Estimated Age
299 to 323 million years
Preservation Type
Carbonization (extreme high-pressure coalification)
Condition Assessment
Fair/Good; intact as a mineral specimen but lacks specific botanical articulation
Taxonomic Classification
Kingdom: Plantae (derived from various lycopsids and pteridosperms)
Morphological Description
Angular, sub-triangular fragment with conchoidal fracture patterns typical of anthracite. Features sharp edges and a vitreous to sub-metallic luster on fresh surfaces.
Rock Matrix
Self-matrix of anthracite coal; may contain trace inclusions of pyrite or clay minerals
Formation & Location
Llewellyn Formation, Pennsylvania, USA (Appalachian Basin)
Size & Dimensions
Approximately 8-10 cm in length; consistent with typical hand-sized coal samples
Value & Rarity
Estimated Market Value
$5.00 - $15.00 USD
Auction Estimate
$10.00 - $30.00 USD (as part of a bulk geological lot)
Rarity Assessment
Common; high-grade anthracite is abundant in specific localized geological regions
Scientific Significance
Represents the sequestered carbon of ancient swamp forests and the geological process of coalification and metamorphism.
Preparation Recommendations
Keep in a low-humidity environment to prevent pyritic oxidation; handle with gloves to avoid carbon transfer.
Notable Features
Distinctive triangular shape that mimics a lithic artifact (arrowhead) but is the result of natural sedimentary cleavage and fracture.