Sapphire
Corundum (Al2O3)
gemstone
Category
Sedimentary (Alluvial Deposit)
Browse sedimentary (alluvial deposit) specimens identified by the Rock Identifier community.
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Blue Topaz
Aluminum Silicate Fluoride Hydroxide, Al2SiO4(F,OH)2
gemstone
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Rough Blue Sapphire
Corundum (Al2O3)
mineral
Gold Nugget / Gold Flakes
Native Gold (Au)
mineral
Carbonado (Black Diamond)
Carbonado (Polycrystalline Diamond)
mineral
Gold
Native Gold (Au)
mineral
Black Sapphire (Basaltic Blue Sapphire)
Corundum (Al2O3)
mineral
Chalcedony Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Clear Quartz / Rock Crystal
Silicon Dioxide (SiO2)
mineral
Onyx Marble (Banded Calcite)
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Chert (Flint variety)
Chert (SiO2)
sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Quartzite Pebble
SiO2 (Silicon Dioxide)
metamorphic
Quartz Pebble (Quartzite / Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Shungite
Carbon-rich mineraloid (Amorphous carbon)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Conglomerate (pebble-to-cobble gravel)
Polymictic conglomerate; clast-supported conglomerate in a sandy or silty matrix
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper and Quartz River Pebble
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartzite Pebbles
Quartzite (SiO2)
metamorphic
River Rock (Quartzite)
Quartzite
metamorphic
Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)
Chert (microcrystalline quartz)
Metamorphic Rock
Conglomerate
Conglomerate
sedimentary
Pink Opal
Hydrated amorphous silica (SiO2·nH2O)
gemstone
Jasper
Silicon dioxide (SiO2)
mineral
Quartz (Microcrystalline/Gravel)
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate
Sedimentary
Conglomerate
Polymictic clast-supported conglomerate, likely ferruginous
sedimentary
Ruby (Corundum)
Al2O3 (Aluminium oxide with Chromium impurities)
Mineral
Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Diamond (Cut Gemstone)
Natural Carbon (C)
gemstone
Diamond
Natural Carbon (C)
mineral
Diamond (Faceted)
Diamond (Carbon, C)
mineral
Ruby
Corundum (Al2O3 with Chromium trace impurities)
mineral
Diamond (in a Gold Jewelry Setting)
Carbon (C)
mineral
Quartzite Pebble (River Rock)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Diamond (or Diamond Simulant)
Carbon (C)
gemstone