Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Category
Marble
Browse marble specimens identified by the Rock Identifier community.
Quartzite
Quartzite
Metamorphic
Weathered limestone
Calcite-rich limestone (CaCO₃), possibly fossiliferous
sedimentary
Weathered limestone fragment
Calcite-rich limestone (CaCO₃), possibly chalky or fossiliferous limestone
sedimentary
Light-colored weathered rocks, possibly limestone or quartz-rich stone
Probable limestone/calcitic rock; exact identification is uncertain because strong flash overexposure obscures texture
sedimentary
Polished orange calcite
Calcite (calcium carbonate, CaCO₃), likely banded honey/orange calcite
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
White Marble Spherical Bead
Recrystallized Calcite (CaCO3)
metamorphic
Glazed Ceramic Tile
Fused Silicate-Clay composite
Synthetic (Man-made material mimicking natural stone)
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Tumbled white-gray stone, likely calcite or marble
Calcite (CaCO₃), possibly fine-grained marble (recrystallized calcite)
mineral
Polished calcite sphere
Calcite (CaCO₃), likely banded or massive calcite
mineral
Likely tumbled quartz or calcite
Quartz (SiO₂) or calcite (CaCO₃); exact identification requires hardness and acid tests
mineral
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Granite
Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Pebble (River Rock)
Quartzite (primarily SiO2)
metamorphic
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Polished serpentine pebble
Serpentinite, chiefly serpentine-group minerals (antigorite/lizardite; approximate formula Mg3Si2O5(OH)4)
metamorphic
Serpentine
Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Orange calcite
Calcite (CaCO₃)
mineral
Likely calcite cleavage fragment
Calcite (CaCO₃)
mineral
Raw Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Blue Sapphire
Corundum (Al2O3 with Cr, Fe, and Ti trace elements)
gemstone
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Lapis Lazuli
Lapis Lazuli (Rock composed primarily of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Lapis Lazuli
Lapis Lazuli (Complex silicate mixture containing Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Sapphire
Corundum (Al2O3)
gemstone
Lapis Lazuli
Lapis Lazuli (Complex rock mainly composed of Lazurite, Calcite, and Pyrite)
metamorphic
Lapis Lazuli
Lapis Lazuli (Complex silicate mineral mix including Lazurite, Pyrite, and Calcite)
metamorphic
Blue Sapphire (in a faceted jewelry setting)
Corundum (Al2O3) with trace Iron and Titanium
mineral
White Sapphire
Corundum (Al2O3)
mineral
Calcite (Optical or Clear Calcite)
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Optical Calcite (Iceland Spar)
Calcite (Calcium Carbonate, CaCO3)
mineral