Not a fossil (Garnet-bearing metamorphic rock or pegmatite)
N/A (Inorganic geological formation) • None (Geological rock specimen, not of biological origin)
Geological Period
Precambrian to Paleozoic (typically associated with metamorphic terranes)
Estimated Age
Variable (frequently hundreds of millions to billions of years old depending on regional geology)
Preservation Type
N/A (Inorganic mineral crystallization and regional metamorphism)
Condition Assessment
Good (natural weathering, water-worn smooth surfaces with intact mineral grains, completely non-fossiliferous)
Taxonomic Classification
N/A (Mineral aggregate: Silicate minerals, Almandine garnet)
Morphological Description
Irregular rounded pebble featuring reddish-purple euhedral to subhedral crystal grains embedded within a lighter-colored felsic or quartz-feldspathic matrix, showing signs of water-wear and weathering.
Rock Matrix
Metamorphic rock matrix containing quartz, feldspar, and accessory minerals with secondary iron-oxide weathering staining
Formation & Location
Glacial tills, stream beds, and metamorphic or pegmatitic rock outcrops globally (e.g., Adirondacks, New England, Scandinavia)
Size & Dimensions
Approximately 3 cm to 5 cm in maximum diameter, typical for a small alluvial or glacial pebble
Value & Rarity
Estimated Market Value
$5 - $15 USD (as a mineral specimen or educational rock sample)
Auction Estimate
$0 - $10 USD (not typically traded at natural history fossil auctions)
Rarity Assessment
Common (widely distributed geological rock and mineral assemblage)
Scientific Significance
Illustrates petrological processes, regional metamorphism, and mineral crystallization rather than paleontological history
Preparation Recommendations
Standard cleaning with mild soap and water to remove dirt; can be tumbled or polished to highlight internal crystal structures
Notable Features
Distinct deep red-purple mineral porphyroblasts (likely garnet) contrasting against a lighter matrix, demonstrating classic metamorphic rock texture