Rock Identifier

Category

Organic Gemstone (Not A Rock Or Mineral)

Browse organic gemstone (not a rock or mineral) specimens identified by the Rock Identifier community.

Learn about Organic Gemstone (Not A Rock Or Mineral) in the encyclopedia

Rock Salt

Rock Gypsum

Coral Rock

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Sapropel

Halite

Black Shale

Bituminous Shale

Bituminous Shale

Dolomite

Gypsum

Shale with Pyrite (Clastic sedimentary rock containing Iron Disulfide (FeS2)) — sedimentary

Shale with Pyrite

Clastic sedimentary rock containing Iron Disulfide (FeS2)

Pyrite Geode (Sparkling Druzy) (Iron Sulfide (FeS2) in Sedimentary Nodule) — mineral

Pyrite Geode (Sparkling Druzy)

Iron Sulfide (FeS2) in Sedimentary Nodule

Chalcedony (Agate / Moss Agate) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate / Moss Agate)

Silicon Dioxide (SiO2)

Petrified Wood (Silicified Wood (primarily SiO2)) — metamorphic

Petrified Wood

Silicified Wood (primarily SiO2)

Turquoise cabochon pendant (Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O) — gemstone

Turquoise cabochon pendant

Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O

Turquoise (Turquoise, CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

Turquoise, CuAl6(PO4)4(OH)8·4H2O

Translucent yellow-orange mineral specimen, possibly amber or citrine (Uncertain; amber is fossilized tree resin (organic), while citrine is quartz, SiO₂) — mineral

Translucent yellow-orange mineral specimen, possibly amber or citrine

Uncertain; amber is fossilized tree resin (organic), while citrine is quartz, SiO₂

Septarian Nodule (Dragon Stone) (Septarian concretion (composition: CaCO3 - Calcite, Aragonite, and Siderite/Limestone)) — sedimentary

Septarian Nodule (Dragon Stone)

Septarian concretion (composition: CaCO3 - Calcite, Aragonite, and Siderite/Limestone)

Likely graphite-rich metamorphic rock (graphitic schist) (Graphitic schist; chiefly carbon (graphite) with quartz, mica, and possibly sulfides) — metamorphic

Likely graphite-rich metamorphic rock (graphitic schist)

Graphitic schist; chiefly carbon (graphite) with quartz, mica, and possibly sulfides

Ironstone Concretion (Boxwork) (Siderite-Limonite Concretion (FeO(OH)·nH2O)) — sedimentary

Ironstone Concretion (Boxwork)

Siderite-Limonite Concretion (FeO(OH)·nH2O)

Chert (varieties include Flint and Jasper) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Emerald in Matrix (Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities) — gemstone

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Lake Superior Agate (Banded Chalcedony (Silicon Dioxide, SiO2)) — mineral

Lake Superior Agate

Banded Chalcedony (Silicon Dioxide, SiO2)

Petrified Wood (Silicified wood (primarily quartz, SiO2)) — fossil

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Chert (often called Jasper or Flint) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (often called Jasper or Flint)

Microcrystalline Silica (SiO2)

Emerald in Matrix (Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities) — mineral

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Tufa (Limestone) (Calcareous Tufa (CaCO3)) — sedimentary

Tufa (Limestone)

Calcareous Tufa (CaCO3)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Yellow Jasper (Mookaite style) (Silicon Dioxide (SiO2) with Goethite/Hematite inclusions) — sedimentary

Yellow Jasper (Mookaite style)

Silicon Dioxide (SiO2) with Goethite/Hematite inclusions

Amber (Succinates (Organic Fossilized Resin)) — mineraloid

Amber

Succinates (Organic Fossilized Resin)

Chert / River Pebble (Silicon Dioxide (SiO2)) — sedimentary

Chert / River Pebble

Silicon Dioxide (SiO2)

Unidentified dark, flat specimen (Indeterminate; image resolution is insufficient for mineral identification) — mineral

Unidentified dark, flat specimen

Indeterminate; image resolution is insufficient for mineral identification

Sandstone Concretion (Clastic sedimentary rock (primarily Quartz SiO2)) — sedimentary

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Blue glass-like bead or gemstone keychain ornament (Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image) — gemstone

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Sandstone (Arenite (primarily composed of SiO2)) — sedimentary

Sandstone

Arenite (primarily composed of SiO2)

Garnet-bearing rock (likely almandine garnet in a metamorphic matrix) (Almandine garnet, Fe₃Al₂(SiO₄)₃; host rock is uncertain from the image) — metamorphic

Garnet-bearing rock (likely almandine garnet in a metamorphic matrix)

Almandine garnet, Fe₃Al₂(SiO₄)₃; host rock is uncertain from the image

Polished moss agate (likely) (Chalcedony, microcrystalline SiO₂, with included green minerals such as chlorite or hornblende) — gemstone

Polished moss agate (likely)

Chalcedony, microcrystalline SiO₂, with included green minerals such as chlorite or hornblende

Carnelian (Orange Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Carnelian (Orange Chalcedony)

Silicon Dioxide (SiO2)

Fossilized Bone / Dinosaur Fossil (Fossilized vertebrate bone (permineralized)) — fossil

Fossilized Bone / Dinosaur Fossil

Fossilized vertebrate bone (permineralized)

Polished gray metamorphic stone, likely marble (Calcite-dominant marble (CaCO₃), possibly dolomitic marble) — metamorphic

Polished gray metamorphic stone, likely marble

Calcite-dominant marble (CaCO₃), possibly dolomitic marble

Tumbled amber (Fossilized tree resin; predominantly polymerized diterpenoid resin (succinite when Baltic-type)) — fossil

Tumbled amber

Fossilized tree resin; predominantly polymerized diterpenoid resin (succinite when Baltic-type)

Amber (Fossilized Tree Resin) — gemstone

Amber

Fossilized Tree Resin

Opal (Hydrated amorphous silica, SiO2·nH2O) — gemstone

Opal

Hydrated amorphous silica, SiO2·nH2O

Amber (Succinite (C10H16O)) — gemstone

Amber

Succinite (C10H16O)

Uncertain small tan mineral/rock fragment (Indeterminate from image; possibly feldspar-rich rock or calcite) — mineral

Uncertain small tan mineral/rock fragment

Indeterminate from image; possibly feldspar-rich rock or calcite

Chert (with Drusy Quartz Pocket) (Silicon Dioxide (SiO2)) — sedimentary

Chert (with Drusy Quartz Pocket)

Silicon Dioxide (SiO2)

Brachiopod Fossil in Limestone (Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)) — sedimentary

Brachiopod Fossil in Limestone

Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)