Quartzite
Quartzite (primarily SiO2)
Category
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
Quartzite
Quartzite (primarily SiO2)
Rough Green Sapphire (Corundum)
Corundum (Al2O3 - Aluminum Oxide with trace elements)
Quartzite
Quartzite (primarily SiO2)
Diamond
Diamond (pure carbon, C)
Olivine (Peridotite/Dunite)
Olivine (Mg,Fe)2SiO4 within Peridotite
Aquamarine
Beryl (Be3Al2Si6O18)
Red Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
Green Calcite
Calcite (CaCO3)
Sandstone
Arenite (primarily SiO2)
Sandstone
Arenite (SiO2 primarily)
Fossiliferous limestone, possibly an oyster or other bivalve fossil
Calcite (CaCO₃) shell material preserved in micritic limestone; exact fossil taxon cannot be confirmed from one image
Quartz (Granular Milky Quartz fragment)
Silicon Dioxide (SiO2)
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
Goldfish Cracker (Culinary Mimic)
Cibus aurum (Commonly composed of Enriched Wheat Flour and Cheddar Cheese)
Pyrite
Iron Sulfide (FeS2)
Diamond (or Diamond Simulant)
Carbon (C)
Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
Native Copper
Native Copper (Cu)
Ferruginous Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Hematite)
Pearls
Pearl: biomineralized aragonite (CaCO₃) and conchiolin
Sandstone
Arenite (typically SiO2 based)
Sandstone
Arenite
Blue Calcite
Calcium Carbonate (CaCO3)
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in sedimentary/volcanic host
Quartz Geode
Silicon Dioxide (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Fairy Stone (Staurolite Concretion)
Staurolite (Fe2+2Al9Si4O23(OH))
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
Basalt
Basalt (Mafic Extrusive Igneous Rock)
Quartzite
Quartzite (primarily SiO2)
Quartzite
Quartzite (primarily SiO2)
Yellow Quartzite Pebble
Quartzite (SiO2)
Limestone (Fossiliferous)
Calcium Carbonate (CaCO3) - Bioclastic Limestone
Wishing Stone (Basalt/Greywacke with Quartz Vein)
Basalt or Siltstone with SiO2 (Quartz) hydrothermal intrusion
Spider Conch Shell
Lambis lambis (Calcium Carbonate, CaCO3)
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Dumortierite Quartz
Dumortierite (Al7BO3(SiO4)3O3 / inclusion in SiO2)
Conglomerate (Red Sandstone variety)
Clastic Sedimentary Rock (Conglomeratic Sandstone)
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Epidote with Unakite characteristics
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Chert
Microcrystalline Quartz (SiO2)
Anthracite Coal
Anthracite (high-rank coal / Carbon)