Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide)
mineral
Category
This Image Does Not Display A Rock, Mineral, Or Geological Specimen. It Shows A Human Hand Wearing A Ring.
Browse this image does not display a rock, mineral, or geological specimen. it shows a human hand wearing a ring. specimens identified by the Rock Identifier community.
Dragon Blood Jasper
Epidote-containing Quartz and Chlorite (SiO2 + (Ca2(Al, Fe)3(SiO4)3(OH)))
sedimentary
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Quartz / Iron-Stained Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions/staining
mineral
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Limonite (Iron Ore)
Limonite (unstructured hydrated iron(III) oxide-hydroxides, often FeO(OH)·nH2O)
mineral
Sandstone (Ferruginous)
Arenite (Fe-bearing Clastic Sedimentary Rock)
sedimentary
Chert (Iron-stained)
Microcrystalline silica (SiO2) with trace Iron oxide (Fe2O3)
sedimentary
Botryoidal Chalcedony (likely Chert or Agatized Coral)
Silicon Dioxide (SiO2)
mineral
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Banded Agate (specifically Moss Agate or Plume Agate variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Note: Item is not a geological specimen
Polyester mesh and Ethylene-vinyl acetate (EVA) polymer
Synthetic / Anthropogenic Material
Basalt
Extrusive Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)
igneous
Labradorite (Larvikite variety)
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8 with Monzonite/Syenite matrix
igneous
Schist
Mica Schist
metamorphic
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite (River Pebble)
Metamorphic Quartzite (SiO2)
metamorphic
Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Limonite (Iron Stone/Ocher)
Limonite (FeO(OH)·nH2O)
mineral
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Native Copper
Native Copper (Cu)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper (Multi-color Chert)
Silicon dioxide (SiO2)
sedimentary
Porphyritic Andesite
Andesite
igneous
Chert (Agatized)
Silicon dioxide (SiO2)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Yellow Quartzite (Citrine-colored Quartz)
Silicon Dioxide (SiO2)
metamorphic
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Mineraloid
Basalt (Beach Pebble)
Basalt (Aphanitic Mafic Igneous Rock)
Igneous
Larimar
Pectolite (NaCa2Si3O8(OH))
mineral
Basalt
Extrusive mafic igneous rock
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Dragon Vein Agate
Chalcedony (cryptocrystalline silica, SiO2) variety Agate
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Iron Gossan (Limonite/Goethite)
Hydrated Iron Oxides (FeO(OH)·nH2O) from oxidation zones
sedimentary
Jasper Breccia
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Amethyst (Raw Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
sedimentary