Ruby (Corundum)
Aluminum oxide (Al2O3) with Chromium traces
mineral
Category
Marble
Browse marble specimens identified by the Rock Identifier community.
Ruby (in jewelry)
Corundum (Al2O3 with Chromium traces)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Emerald with Matrix (Emerald in Mica Schist)
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Star Ruby
Corundum (Al2O3 with chromium and rutile inclusions)
mineral
Lapis Lazuli (Carved)
Lazurite-rich metamorphic rock (approx. (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
metamorphic
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Blue Sapphire (likely costume glass imitation)
Corundum (Al2O3) with iron/titanium impurities
mineral
Ruby in Matrix
Corundum (Al2O3)
mineral
Weathered limestone pebble
Limestone; predominantly calcite (CaCO₃)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Zebra Jasper
Tainted Silicate (mainly Quartz/Chalcedony/Calcite)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Zebra Jasper
Tectonized Jasper (Silicon Dioxide, SiO2)
sedimentary
Calcite Rhomb
Calcium Carbonate (CaCO3)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Pink Quartzite
Quartzite (SiO2)
metamorphic
Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)
Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)
Synthetic (Ceramic)
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Quartzite (Iron-Stained Quartz)
Quartzite (SiO2 with Fe-oxide impurities)
metamorphic
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Aragonite (Banded Calcite / 'Mexican Onyx')
Aragonite (Calcium Carbonate - CaCO3)
mineral
Map Jasper (Grey Picasso Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Likely calcite fragment
Calcite (CaCO₃), possibly limestone or marble
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Optical Calcite
CaCO3 (Calcium Carbonate)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
Mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Banded Calcite
Calcium Carbonate (CaCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Serpentine (variety: Serpentine Rock)
Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Banded calcite (onyx marble)
Calcite, CaCO₃; commonly sold as “honey onyx” or “Pakistan onyx”
mineral
Red Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Tumbled yellow-orange calcite
Calcite (CaCO₃), likely honey or orange calcite
mineral