Rock Identifier

Category

Artifact

Browse artifact specimens identified by the Rock Identifier community.

Sandstone Concretion (Sedimentary concretion) — Sedimentary

Sandstone Concretion

Sedimentary concretion

Tumbled carnelian (orange chalcedony) (Carnelian, a microcrystalline variety of quartz (SiO₂)) — mineral

Tumbled carnelian (orange chalcedony)

Carnelian, a microcrystalline variety of quartz (SiO₂)

Iron-stained quartz-rich metamorphic rock (probable quartzite or hydrothermal vein rock) (Quartz-dominant rock; chiefly SiO₂, with iron oxides/hydroxides and minor sulfide minerals) — metamorphic

Iron-stained quartz-rich metamorphic rock (probable quartzite or hydrothermal vein rock)

Quartz-dominant rock; chiefly SiO₂, with iron oxides/hydroxides and minor sulfide minerals

Sandstone Concretion (Sedimentary Concretion (Quartz sandstone with iron oxide cement)) — sedimentary

Sandstone Concretion

Sedimentary Concretion (Quartz sandstone with iron oxide cement)

Yellow Jade (Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)) — gemstone

Yellow Jade

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)

Rock Crystal Quartz Bead (Silicon Dioxide (SiO2)) — mineral

Rock Crystal Quartz Bead

Silicon Dioxide (SiO2)

Obsidian (black volcanic glass) (Obsidian; predominantly rhyolitic volcanic glass, mainly SiO₂ with minor feldspar, quartz, and iron oxides) — igneous

Obsidian (black volcanic glass)

Obsidian; predominantly rhyolitic volcanic glass, mainly SiO₂ with minor feldspar, quartz, and iron oxides

Tumbled carnelian (orange-red chalcedony) (Carnelian, a microcrystalline variety of quartz (SiO₂)) — gemstone

Tumbled carnelian (orange-red chalcedony)

Carnelian, a microcrystalline variety of quartz (SiO₂)

Siltstone/Sandstone (possibly Wonderstone or Picture Sandstone) (Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide inclusions)) — Sedimentary

Siltstone/Sandstone (possibly Wonderstone or Picture Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide inclusions)

Chalcedony (likely prehistoric flaked point) (Microcrystalline quartz, SiO₂; possibly green chalcedony or silicified volcanic material) — mineral

Chalcedony (likely prehistoric flaked point)

Microcrystalline quartz, SiO₂; possibly green chalcedony or silicified volcanic material

Arrowhead made of Moss Agate (Silicon Dioxide (SiO2) with manganese/iron inclusions) — sedimentary

Arrowhead made of Moss Agate

Silicon Dioxide (SiO2) with manganese/iron inclusions

Baltic Amber (Raw) (Succinite) — fossil

Baltic Amber (Raw)

Succinite

Jade Ring (Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)) — gemstone

Jade Ring

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)

Moqui Marbles (Iron Oxide Concretion (Hematite/Goethite)) — sedimentary

Moqui Marbles

Iron Oxide Concretion (Hematite/Goethite)

Chert Arrowhead (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Arrowhead

Microcrystalline Quartz (SiO2)

Argillite (Argillite (compacted clay- and silt-sized mineral particles)) — sedimentary

Argillite

Argillite (compacted clay- and silt-sized mineral particles)

Flint (Cryptocrystalline quartz (SiO2)) — sedimentary

Flint

Cryptocrystalline quartz (SiO2)

Chert Nodule (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodule (Flint)

Microcrystalline Quartz (SiO2)

Flint (Microcrystalline Quartz (SiO2)) — sedimentary

Flint

Microcrystalline Quartz (SiO2)

Chert / Flint (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Chert (Flint) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline quartz (SiO2)

Chert / Flint (Cryptocrystalline quartz (SiO2)) — sedimentary

Chert / Flint

Cryptocrystalline quartz (SiO2)

Obsidian Arrowhead (Volcanic Glass (Amorphous Silicon Dioxide)) — igneous

Obsidian Arrowhead

Volcanic Glass (Amorphous Silicon Dioxide)

Chert (Arrowheads) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Arrowheads)

Microcrystalline Quartz (SiO2)

Chert (Microcrystalline quartz (SiO2)) — sedimentary

Chert

Microcrystalline quartz (SiO2)

Diorite (Intermediate plutonic igneous rock) — igneous

Diorite

Intermediate plutonic igneous rock

Nephrite Jade (Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)) — metamorphic

Nephrite Jade

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)

Chert (Silicon dioxide (SiO2)) — sedimentary

Chert

Silicon dioxide (SiO2)

Flint (SiO2 (Microcrystalline Quartz / Chert)) — sedimentary

Flint

SiO2 (Microcrystalline Quartz / Chert)

Flint (SiO2 (Cryptocrystalline Quartz)) — sedimentary

Flint

SiO2 (Cryptocrystalline Quartz)

Chert (Chert (SiO2, Silicon Dioxide)) — sedimentary

Chert

Chert (SiO2, Silicon Dioxide)

Chert (Flint) (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (often called Flint) (Chert (SiO2)) — sedimentary

Chert (often called Flint)

Chert (SiO2)

Chert (Flint) (Chert (Cryptocrystalline Silicon Dioxide, SiO2)) — sedimentary

Chert (Flint)

Chert (Cryptocrystalline Silicon Dioxide, SiO2)

Chert (Jasper focus) (Silicon dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Jasper focus)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Chert (and Flint) (Chert (SiO2)) — sedimentary

Chert (and Flint)

Chert (SiO2)

Chert (Field-collected specimen) (Chert (Crystalline Silica, SiO2)) — sedimentary

Chert (Field-collected specimen)

Chert (Crystalline Silica, SiO2)

Chert (Pink and Yellow Chert) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Pink and Yellow Chert)

Microcrystalline Quartz (SiO2)

Chert (Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert / Flint Pebble (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert / Flint Pebble

Cryptocrystalline Quartz (SiO2)

Chert / Flint (Chert (SiO2)) — sedimentary

Chert / Flint

Chert (SiO2)