Sedimentary (If Limestone) Or Metamorphic (If Marble)

Polished white marble tile

Calcite marble (predominantly CaCO₃)

Picasso Jasper

Microcrystalline Quartz (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Lapis Lazuli

Lazurite-dominant Metamorphic Rock (complex aluminosilicate)

Banded Marble (Egg Carving)

Metamorphic crystalline limestone (predominantly Calcite, CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Honey Calcite

Calcium Carbonate (CaCO3)

Yellow Calcite

Calcium Carbonate (CaCO3)

Blue Spinel on Marble with Phlogopite

MgAl2O4 (Spinel) in CaCO3 (Calcite/Marble) matrix

Rounded calcite-rich limestone or marble pebble

Calcite (CaCO₃), likely recrystallized limestone (marble)

Calcite-rich marble or limestone

Calcite (CaCO₃), likely recrystallized limestone (marble)

Limestone (probable fossiliferous limestone)

Calcite-rich carbonate rock; predominantly CaCO₃ (calcite)

Orange Calcite

Calcium Carbonate (CaCO3)

Likely weathered marble or calcite-rich metamorphic rock

Calcite (CaCO₃), probably marble; exact identification requires testing

Crinoid Marble

Crinoidal Limestone/Marble

Blue Calcite

Calcium Carbonate (CaCO3)

Blue Calcite

Calcium Carbonate (CaCO3)

Gray-white marble

Calcite marble (recrystallized limestone; primarily CaCO₃)

Brecciated Limestone or Marble Pebble

Breccia / Calcite (CaCO3)

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

Picasso Jasper (also known as Picasso Marble)

Metamorphosed Limestone (Calcium Carbonate with impurities)

Tumbled quartzite pebble

Quartzite, predominantly crystalline SiO₂

Calcite-rich limestone or marble fragment

Calcite (CaCO₃), likely recrystallized carbonate rock

Mixed polished river stones

Likely quartz, quartzite, chert/jasper, and possibly limestone or marble

Weathered limestone

Calcite-rich limestone (CaCO₃), possibly fossiliferous or micritic

Fossiliferous limestone

Bioclastic limestone, primarily calcite (CaCO₃)

Marble (Polished Egg)

Metamorphic Limestone (predominantly Calcite, CaCO3)

Tumbled zebra calcite (likely calcite marble)

Calcite, CaCO₃; commonly recrystallized limestone/marble with dark graphite- or carbon-rich bands

Calcite

Calcium Carbonate (CaCO3)

Calcite (Honey Calcite and Agate)

Calcium Carbonate (CaCO3)

Lapis Lazuli (Tumbled)

Lazurite-dominated contact metamorphic rock

Tumbled white/yellow stone, likely calcite or marble

Calcite (CaCO₃), possibly crystalline limestone or marble

White limestone

Calcite-dominated carbonate rock (CaCO₃), possibly chalky limestone

Light-colored weathered rocks, possibly limestone or quartz-rich stone

Probable limestone/calcitic rock; exact identification is uncertain because strong flash overexposure obscures texture

Fossiliferous limestone, likely crinoidal limestone

Bioclastic limestone; predominantly calcite (CaCO₃), with possible dolomite and silicate impurities

Banded Calcite (often sold as 'Mexican Onyx')

Calcium Carbonate (CaCO3)

Tumbled white stone, possibly quartz or marble

Uncertain; likely quartz (SiO₂) or calcite-rich marble (CaCO₃)

Green Calcite

Calcium Carbonate (CaCO3)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Light-colored weathered stone, likely limestone

Limestone, predominantly calcite (CaCO₃)

Chalky limestone

Calcite-rich limestone; chiefly calcium carbonate (CaCO₃)

White marble tile

Calcite-rich marble (CaCO₃)