Sedimentary (If Limestone) Or Metamorphic (If Marble)

Rounded limestone pebble

Limestone, predominantly calcite (CaCO₃)

Polished banded limestone or marble pebble

Calcite-rich carbonate rock (CaCO₃), possibly banded marble

Ruby

Corundum (Al2O3 with Chromium impurities)

Veined marble or calcitic limestone

Calcite-dominant carbonate rock (CaCO₃), likely marble

Yellow Calcite (Carved Egg)

Calcite (Calcium Carbonate, CaCO3)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Orange Calcite

Calcium Carbonate (CaCO3)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite)

Quartzite

Metamorphic Quartzite (SiO2)

Banded calcite (likely polished limestone/marble fragment)

Calcite, CaCO₃; probable banded calcitic marble

Pink Granite

Phaneritic Quartz-Feldspar Plutonic Rock

Calcite (Optical Grade/Iceland Spar)

Calcium Carbonate (CaCO3)

Fossiliferous limestone

Bioclastic carbonate rock, predominantly calcite (CaCO₃)

Fossiliferous limestone

Bioclastic limestone, composed mainly of calcite (CaCO₃)

Quartzite Pebble

Quartzite (SiO2)

Red Quartzite

Quartzite (primarily SiO2)

Lapis Lazuli

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite and other associated minerals)

Lapis Lazuli

Na8(Al6Si6O24)S2 (composed primarily of Lazurite, Calcite, and Pyrite)

Likely limestone or calcareous shale

Calcite-rich carbonate rock; predominantly calcium carbonate (CaCO₃), possibly micritic limestone

Limestone countertop or floor tile

Calcite-rich limestone, composed mainly of calcium carbonate (CaCO₃)

Lapis lazuli rough

Lapis lazuli, a rock composed mainly of lazurite (Na₃CaAl₃Si₃O₁₂S) with calcite and commonly pyrite

Translucent calcite-rich rock, possibly calcite vein or marble

Calcite (CaCO₃), likely in a calcite-rich aggregate; exact rock identification is uncertain from the photo

Lapis lazuli (likely)

Lapis lazuli, a rock composed mainly of lazurite (ideally (Na,Ca)₈(AlSiO₄)₆(S,SO₄,Cl)₂), with calcite and commonly pyrite

Lapis Lazuli

Lapis Lazuli (Complex metamorphic rock primarily composed of Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)

Lapis Lazuli

Complex metamorphic rock primarily composed of Lazurite ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2), Calcite, and Pyrite

Inscribed limestone fragment

Calcitic limestone (primarily CaCO₃), possibly marble if recrystallized

Calcite

Calcium Carbonate (CaCO3)

Yellow calcite

Calcite, CaCO₃

Crinoid Fossil Marble

Crinoidal Limestone / Phylum Echinodermata

Massive calcite (likely limestone-derived calcite)

Calcite, calcium carbonate (CaCO₃); possibly a chalky limestone fragment

Tumbled orange calcite

Calcite (calcium carbonate, CaCO₃)

Orange Calcite

Calcium Carbonate (CaCO3)

Honey Calcite

Calcium Carbonate (CaCO3)

Fossilized Crinoid Stem in Matrix

Crinoid (Class: Crinoidea)

Lapis Lazuli

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

Likely calcite-rich limestone

Calcite (CaCO₃), probably micritic or fossiliferous limestone

Golden Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Green Calcite

Calcium Carbonate (CaCO3)

Tumbled yellow calcite

Calcite, CaCO₃

Weathered limestone

Limestone, predominantly calcite (CaCO₃)

Orange Calcite

Calcium Carbonate (CaCO3)