Rounded gray river pebble, likely basalt or andesite
Fine-grained mafic to intermediate volcanic rock; commonly basalt (plagioclase + pyroxene, sometimes olivine)
igneous
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
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Ironstone / Limonite Concretion
Hydrated Iron Oxide Rock (FeO(OH)·nH2O with SiO2)
sedimentary
Conglomerate
Polymictic Conglomerate
sedimentary
Citrine
Crystalline Quartz (SiO2) with iron impurities
mineral
Sandstone (likely Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Sandstone (with Iron Staining)
Arenite (Silicon Dioxide, SiO2, often with iron oxides like Limonite)
sedimentary
Shale with Trace Fossils
Fissile mudrock (Shale)
sedimentary
Smoky Quartz with Feldspar
SiO2 (Quartz) with KAlSi3O8 (Feldspar)
mineral
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Dyed Agate
Silicon Dioxide (SiO2) with artificial colorants
mineral
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Sandstone (Iron-stained)
Clastic sedimentary rock (SiO2 with Fe2O3 staining)
sedimentary
Citrine
Silicon Dioxide (Quartz variety), SiO2
mineral
Citrine
Silicon Dioxide (Quartz variety), SiO2
mineral
Citrine Quartz carving
Silicon Dioxide (SiO2)
mineral
Diamond (Cut Gemstone)
Carbon (C)
mineral
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
Chert (or Flint)
Chert (a cryptocrystalline variety of quartz, SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amber (specifically Cherry Amber)
Succinite (with the chemical formula C10H16O)
Organic Gemstone (not a mineral)
Cubic Zirconia (Diamond Simulant)
Zirconium Dioxide (ZrO2)
mineral
Granite
Phaneritic Igneous Rock (Granite)
igneous
Sandstone Pebble
Sandstone (Siliciclastic Sedimentary Rock)
sedimentary
Asphalt (Bituminous pavement fragment)
Artificial conglomerate / Bitumen-Aggregate mixture
sedimentary
Obsidian (Apache Tear)
Obsidian / Amorphous Volcanic Glass (main component: SiO2)
igneous
Diamond
C (Native Carbon)
mineral
Granite
Granite (primarily Quartz, Feldspar, and Mica)
igneous
Sapphire
Corundum (Al2O3)
mineral
Blue Quartz
Silicon Dioxide (SiO2)
mineral
Blue Lace Agate (Tumbled)
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium
mineral
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
Hag Stone
Perforated Sedimentary Rock (typically Limestone or Sandstone)
sedimentary
Sandstone (Ferruginous / River-worn Cobble)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Pyrite Nodule
Iron Sulfide (FeS2)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Small brown-gray mineral fragment
Indeterminate; possibly weathered quartz-, feldspar-, or iron-oxide-bearing rock
mineral
Red jasper (likely polished/tumbled)
Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides
mineral
Amethyst and Calcite collection
Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)
mineral