Sedimentary (If Limestone) Or Metamorphic (If Marble)

Polished black stone, possibly black marble or basalt

Probable fine-grained mafic rock; exact identification requires testing

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Yellow Calcite

Calcium Carbonate (CaCO3)

Blue calcite-rich marble or limestone

Calcite (CaCO₃), likely recrystallized as marble; possibly aragonite-bearing limestone

Likely tumbled quartz or calcite

Quartz (SiO₂) or calcite (CaCO₃); exact identification requires hardness and acid tests

Light-colored tumbled stone, likely quartzite or marble

Quartzite (mostly SiO₂) or calcitic marble (CaCO₃); exact identification is uncertain from the image

Weathered limestone fragment

Calcite-rich limestone, chiefly calcium carbonate (CaCO₃)

Polished fossiliferous stone egg, likely fossiliferous limestone or marble

Unidentified carbonate rock; likely calcite-rich limestone (CaCO₃), possibly fossil-bearing

Lapis Lazuli

Lapis Lazuli (Mineral composition: Lazurite, Calcite, Sodalite, and Pyrite)

Lapis Lazuli

Complex mixture of minerals, primarily Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Lapis Lazuli

Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

White limestone, possibly chalky limestone

Calcite-rich carbonate rock; predominantly calcium carbonate (CaCO₃)

Lapis Lazuli (polished cabochon)

Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)

Lapis Lazuli

Lapis Lazuli (aggregate of Lazurite, Calcite, and Pyrite)

Lapis Lazuli

Complex metamorphic rock containing Lazurite ((Na,Ca)8(AlSiO4)6(SO4,S,Cl)2), Calcite, and Pyrite

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)

Quartzite Pebble

Quartzite (primarily SiO2)

Fossiliferous limestone

Bioclastic calcarenite, predominantly calcite (CaCO₃)

Likely weathered limestone

Calcite-rich limestone (mostly CaCO₃), possibly dolomitic limestone

Likely limestone or chalk

Calcite-rich carbonate rock; predominantly calcium carbonate (CaCO₃)

Yellow-orange tumbled stone, possibly calcite

Uncertain from the image; likely calcite (CaCO₃)

Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Blue Calcite

Calcium Carbonate (CaCO3)

Polished calcite sphere

Calcite (CaCO₃), likely banded or massive calcite

Quartzite

Quartzite (predominantly SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Yellow Calcite

Calcium Carbonate (CaCO3)

Yellowish calcite-rich rock, likely marble or limestone

Calcite (CaCO₃), possibly recrystallized as marble

Tumbled pink brecciated marble or quartzite

Calcite-rich marble, likely with quartz veins; exact identification requires testing

Crinoid Fossil in Limestone

Class Crinoidea in Carbonate Matrix (CaCO3)

Tumbled quartz-rich carbonate rock

Likely massive quartz (SiO₂), possibly calcite-bearing marble or limestone

Orange Calcite

Calcium Carbonate (CaCO3)

Quartzite

Quartzite (chiefly SiO2)

White marble countertop

Calcite-rich marble (recrystallized limestone; chiefly CaCO₃)

Weathered limestone

Micritic limestone, primarily calcium carbonate (CaCO₃; calcite)

Orange Calcite

Calcite (Calcium Carbonate - CaCO3)

Banded Calcite / Onyx Marble

Calcite (Travertine / Onyx Marble, CaCO3)

Coarse-grained marble or calcite-rich metamorphic rock

Calcite (CaCO₃), likely marble with mica and silicate minerals

Brecciated marble (decorative stone slab)

Calcite-rich marble breccia; chiefly calcite (CaCO₃), potentially with dolomite and minor iron oxides

Calcite

Calcium Carbonate (CaCO3)

Likely calcite fragment

Calcite (calcium carbonate, CaCO₃)