Synthetic Polymer (Polylactic Acid)

Bismuth

Bismuth (Bi)

Rutilated Quartz

SiO2 with TiO2 inclusions (Rutile)

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.

Tumbled pale green mineral specimen, likely calcite

Calcite (CaCO₃), tentative identification

Peacock Ore (Bornite or Chalcopyrite)

Bornite (Cu₅FeS₄) or iridescent Chalcopyrite (CuFeS₂)

Quartz / Limestone Gravel

SiO2 (Silicon Dioxide) and CaCO3 (Calcium Carbonate)

Limestone

Calcium Carbonate (CaCO3)

Honey calcite (likely cleavage fragment)

Calcite, CaCO₃

Fossil shell fragment, likely brachiopod or bivalve

Indeterminate fossilized marine mollusk or brachiopod; mineralized calcite shell in a carbonate matrix

Tumbled howlite (likely)

Howlite, Ca₂B₅SiO₉(OH)₅

Oolitic Limestone

Oolite (Sedimentary Calcium Carbonate)

Iron-stained Quartz

Silicon Dioxide with Iron Oxide (SiO2 with Limonite/Hematite impurities)

Fossiliferous limestone

Bioclastic carbonate rock, chiefly calcite (CaCO₃), containing a likely colonial coral or bryozoan fossil

Banded limestone or marble fragment

Calcite-rich carbonate rock; likely banded marble (CaCO₃)

Quartz-rich limestone or calcitic marble

Calcite (CaCO₃), possibly with quartz (SiO₂)

Green Calcite

Calcium Carbonate (CaCO3)

Marble

Recrystallized Calcite / Dolomite (CaCO3)

Orange Calcite (Banded Calcite)

Calcium Carbonate (CaCO3)

Tumbled blue calcite

Calcite (CaCO₃), likely blue calcite variety

Greenish calcite (likely), possibly talc-bearing marble

Calcite, CaCO₃; green coloration may reflect chlorite, epidote, or serpentine inclusions

Fossiliferous limestone, likely coral or shell fragment

Calcitic limestone (primarily CaCO₃), containing preserved marine bioclasts

Banded Calcite (often sold as 'Mexican Onyx')

Calcite (Calcium Carbonate, CaCO3)

Tumbled honey calcite (probable)

Calcite, calcium carbonate (CaCO₃)

Limestone

Calcium carbonate rock (CaCO3)

Limestone

Calcareous sedimentary rock (primarily CaCO3)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)

Aragonite cluster (blue aragonite, likely copper-associated)

Aragonite, orthorhombic CaCO₃; blue color may reflect copper minerals or treatment

Milky quartz

Quartz (silicon dioxide, SiO₂)

Likely weathered quartz-rich stone

Indeterminate; possibly quartz-bearing granite or milky quartz

Fossiliferous Limestone (Bivalve Fossil)

Calcium Carbonate (CaCO3) with Bivalvia fossil

Quartz-rich metallic sulfide ore (probable pyrite-bearing rock)

Pyrite, FeS₂, in a quartz-rich host; exact identification is uncertain from the image

Chalky limestone

Micritic calcite (CaCO₃), likely biogenic limestone/chalk

Tumbled chalcedony or quartz-rich stone

Microcrystalline quartz, SiO₂; possibly pale chert or chalcedony

Orange Calcite

Calcium Carbonate (CaCO3)

Blue Calcite

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Yellow Calcite

Calcium Carbonate (CaCO3)

Chert or chalcedony nodule

Microcrystalline quartz (SiO₂), possibly weathered chert

Fossil bivalve shell

Likely an internal mold or mineralized shell of a brachiopod or small bivalve; exact taxonomy requires locality and diagnostic details

Limestone

Calcium Carbonate (CaCO3)

Fossil bivalve or brachiopod in sedimentary rock

Unidentified fossil shell impression; likely a ribbed bivalve or brachiopod preserved in shale/siltstone

Fossiliferous Limestone

Sedimentary Calcium Carbonate (CaCO3)