Amber
Succinite (C10H16O)
mineraloid
Category
Biogenic Material
Browse biogenic material specimens identified by the Rock Identifier community.
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Obsidian Arrowhead
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flinty variety)
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled orange chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Tektite (Indochinite)
Natural glass (High-silica impact glass)
mineral
Slag Glass (Cullet Glass)
Amorphous Silica (Industrial byproduct)
mineral
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Sandstone
Sandstone (SiO2 predominant)
sedimentary
Carved Stone Turtle
Mixed stone carving
carved stone
Botryoidal iron-rich jasper
Ferruginous jasper/chalcedony, primarily microcrystalline quartz (SiO₂) with iron oxides and hydroxides
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2) with Iron Oxide inclusions
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Agate
Silicon dioxide (chalcedony), SiO2
sedimentary
Granite
Intrusive Igneous Rock
igneous
Flint / Chert
Silicon dioxide (Microcrystalline quartz, SiO2)
sedimentary
Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Common Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Chert (Jasper variety)
Microcrystalline quartz (SiO2)
sedimentary
Agate (Nodule/Chert)
Silicon Dioxide (SiO2)
sedimentary
Small rounded pebble, likely quartz-rich river stone
Indeterminate; likely quartz/chert-bearing lithic clast
sedimentary
Orbicular jasper / brecciated jasper
Silica-rich microcrystalline quartz (chalcedony), commonly with iron oxides and altered volcanic fragments
metamorphic
Dzi Bead (Agate Bead)
Cryptocrystalline Quartz (SiO2) - Chalcedony/Agate
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Jade
Jadeite or Nephrite
Mineral/Mineraloid
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood (SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Travertine
Calcareous Tufa / Travertine (CaCO3)
sedimentary
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral (synthetic)
Beach Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
mineral
Tumbled serpentine with dark magnetite/chromite matrix
Serpentinite; chiefly antigorite/lizardite, Mg3Si2O5(OH)4, with magnetite and possibly chromite
metamorphic
Polished green moss agate cabochon
Moss agate: microcrystalline quartz (SiO₂) with included chlorite/actinolite or iron-manganese minerals
mineral
Polished tree agate (likely)
Chalcedony (microcrystalline SiO₂) with green dendritic/inclusion minerals
mineral
Weathered quartz-rich stone, possibly fossiliferous limestone
Indeterminate; likely calcite-rich limestone (CaCO₃) or weathered quartz-bearing rock
sedimentary
Granite
Intrusive Igneous Rock
igneous