Marble

Lapis Lazuli

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

Ruby (set in a gold pendant)

Ruby (Variety of Corundum, Al2O3)

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Terrazzo (with Marble and Granite fragments)

Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates

Banded onyx (decorative calcite/aragonite)

Travertine or cave-deposit calcite, CaCO₃ (often commercially called onyx marble)

Green Calcite

Calcium Carbonate (CaCO3)

Honey Calcite

Calcium Carbonate (CaCO3)

Calcite-rich limestone (likely crystalline limestone/marble)

Calcite, CaCO₃; likely recrystallized carbonate rock

Banded calcite (onyx marble)

Calcite, CaCO₃; commonly sold as “honey onyx” or “Pakistan onyx”

Banded Calcite (Mexican Onyx)

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Green Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

White quartz-rich rock, possibly marble or quartzite

Quartz (SiO₂)-rich metamorphic stone; exact identification is uncertain from the photograph

Banded limestone or marble pebble

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

Red Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Likely weathered limestone or calcitic marble

Calcite (CaCO₃), probably micritic limestone; marble is a possible metamorphic alternative

Blue calcite-rich marble or limestone

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

Tumbled limestone or marble fragment

Calcite (CaCO₃), likely marble; possibly compact limestone

Polished gray marble slab

Calcite-rich marble (recrystallized limestone; chiefly CaCO₃)

Likely marble or foliated calcite-rich metamorphic rock

Calcite (CaCO₃), probably recrystallized limestone; exact identification is uncertain from the image

Blue-gray calcite-bearing marble

Calcite (CaCO₃), recrystallized as marble; possibly minor quartz or dolomite

Yellow Calcite (Carved Egg)

Calcite (Calcium Carbonate, CaCO3)

Quartz-rich pebble, likely quartzite

Quartzite (predominantly recrystallized quartz, SiO₂)

Rounded limestone pebble

Limestone, primarily calcite (CaCO₃), possibly micritic or fossiliferous

Zebra Jasper

Tainted Silicate (mainly Quartz/Chalcedony/Calcite)

Quartzite

Quartzite (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Tumbled quartzite pebble

Quartzite, predominantly quartz (SiO₂)

Weathered limestone pebble

Limestone; predominantly calcite (CaCO₃)

Quartzite

Quartzite (SiO2)

Zebra Jasper

Tectonized Jasper (Silicon Dioxide, SiO2)

Calcite Rhomb

Calcium Carbonate (CaCO3)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Pink Quartzite

Quartzite (SiO2)

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Orange Calcite

Calcium Carbonate (CaCO3)

Yellow Quartzite (Iron-Stained Quartz)

Quartzite (SiO2 with Fe-oxide impurities)