Organic (Biological Organism)

Moss Agate

Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)

Amber

Fossilized Tree Resin (C10H16O)

Petrified Wood

Silicified Wood (SiO2)

Baltic Amber (Butterscotch or Egg Yolk Variety)

Succinite (chemical formula: C10H16O)

Banded Iron Formation (Fragment)

Banded Iron Formation (BIF)

Petrified Wood

Silicified Wood (SiO2)

Tumbled amber

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin

Banded Iron Formation

Banded Iron Formation (BIF)

Moss Agate

Silicon Dioxide (SiO2) with inclusions

Pumice

Pumice (a highly vesicular volcanic glass)

Jasper (Green/Yellow Moss Jasper)

Silicon Dioxide (SiO2)

Ferruginous Sandstone (Ironstone)

Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Coal (specifically Bituminous or Anthracite)

Organic sedimentary rock; primarily Carbon (C) with varying H, S, O, N

Chert (Green Fossilized Algae or Jasper)

Silicon Dioxide (SiO2)

Amber (Black)

Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)

Milky Quartz Pebble with Hag Stone Feature

Crystalline Silicon Dioxide (SiO2)

Pearl (Biogenic Mineraloid)

Calcium carbonate (Aragonite) and Conchiolin, CaCO3

Arid Sandy Loam

Arenosols / Regosols

Moss Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

Fossiliferous Limestone

Limestone with fossil inclusions (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

River Stone (likely Mudstone or Siltstone)

Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)

Fossilized Bone

Permineralized Vertebrate Bone

Chert (Jasper/Chalcedony mix)

Microcrystalline Quartz (SiO2)

Chert

Siliceous sedimentary rock (predominantly microcrystalline quartz, SiO2)

Petrified Wood

Silicified Wood (SiO2)

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Wood Beads (Palmwood/Ebony)

Various species for wood, but often refers to woods like Palmwood (e.g., Borassus flabellifer) or Ebony (Diospyros spp.) for their distinctive grain and hardness.

Fossil Coral

Phylum Cnidaria / Rugosa or Tabulata

Fossil Coral (Rugose Coral / Horn Coral Cross-Section)

Rugosa (Order) / Calcite (CaCO3)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende, chlorite, or manganese/iron oxides

Amethyst Sage Agate

Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)

Amber (specifically Cherry Amber)

Succinite (with the chemical formula C10H16O)

Petrified Wood

Silicified Wood (primarily SiO2)

Baltic Amber

Succinite (Polmerized conifer resin)

Petrified Wood

Silicified Wood (SiO2)

Black Chert

Carbonaceous Chert (Silicon dioxide, SiO2)

Red Sandstone with Reduction Spot

Quartzose Sandstone with a Leach/Reduction Spot

Petrified Wood

Silicified Wood (primarily SiO₂ / Silicon Dioxide)

Petrified Wood

Silicified Wood (SiO2)