Sedimentary (If Limestone) Or Metamorphic (If Marble)

Calcite

Calcium Carbonate (CaCO3)

White Marble Pebble

Recrystallized Calcite (CaCO3)

Lapis Lazuli (Fragment)

Lazurite-rich metamorphic rock

Ruby (Corundum)

Aluminum oxide (Al2O3) with Chromium traces

Blue Calcite

Calcium Carbonate (CaCO3)

White Marble

Metamorphosed limestone (primarily Calcite, CaCO3)

Tumbled blue-gray stone, likely marble or quartzite

Indeterminate; probably calcite marble (CaCO₃) or quartzite (SiO₂)

Lapis Lazuli

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

Parian marble sculpture fragment

Marble, predominantly calcite (CaCO₃), likely a fine-grained Greek island marble

Calcite

Calcium Carbonate (CaCO3)

Dark Emperador Marble

Recrystallized Calcitic Marble

Banded limestone or marble pebble

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

Polished gray metamorphic stone, likely marble

Calcite-dominant marble (CaCO₃), possibly dolomitic marble

Weathered limestone or calcitic marble

Calcite-rich carbonate rock, chiefly CaCO₃; likely fossiliferous limestone, possibly weakly metamorphosed marble

Marble (Carrara Marble style)

Recrystallized Calcite (CaCO3)

Calcite (Optical Calcite / Iceland Spar)

Calcium Carbonate (CaCO3)

Calcite Crystal Cluster

Calcium Carbonate (CaCO3)

White Marble

Recrystallized Calcite (CaCO3)

White marble (likely calcitic marble)

Calcite-rich marble; primarily calcium carbonate, CaCO₃

Limestone

Calcium Carbonate (CaCO3)

Likely calcite

Calcite, calcium carbonate (CaCO₃)

Marble (Sculptural Statue)

Metamorphic Limestone (CaCO3)

Tumbled pale green calcite

Calcite (CaCO₃)

Lapis Lazuli (Tumbled Stone)

Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (Lazulite-rich Metamorphic Rock)

White marble

Calcite marble, predominantly CaCO₃

Limestone

Micritic limestone, chiefly calcite (CaCO₃)

Calcite

Calcite (CaCO₃), likely crystalline limestone or marble fragment

Calcite-rich limestone (likely crystalline limestone/marble)

Calcite, CaCO₃; likely recrystallized carbonate rock

Black Marble

Recrystallized Limestone (CaCO3)

Marble (Calcitic)

Metamorphosed Limestone (CaCO3)

Rough white calcite

Calcite (calcium carbonate, CaCO₃)

Likely limestone or marble fragment

Calcite-rich carbonate rock; CaCO₃

White marble

Calcite marble (predominantly CaCO₃)

Calcite

Calcium Carbonate (CaCO3)

Crystalline limestone (marble-like calcite rock)

Calcite, CaCO₃; likely recrystallized limestone (marble)

Botryoidal Calcite

Calcium Carbonate (CaCO3)

Yellow Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcite (Calcium Carbonate - CaCO3)

Calcite Vein on Limestone

Calcium Carbonate (CaCO3)

Lapis Lazuli

Lazurite-rich metamorphic rock (approx. (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Lapis Lazuli (polished cabochon)

Lazurite-rich rock (Na8[Al6Si6O24]n(S,Cl,SO4,OH)2)

Veined limestone (likely marbleized limestone)

Calcite-rich carbonate rock, chiefly calcite (CaCO₃); exact identification requires testing