Rock Identifier

Category

Mineraloid (Human Made Geological Specimen)

Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.

Quartz Geode (Silicon Dioxide (SiO2) in a sedimentary host) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2) in a sedimentary host

Shungite (Shungite (carbon-rich Precambrian mineraloid)) — mineral

Shungite

Shungite (carbon-rich Precambrian mineraloid)

Fluorite (Polished Point/Tower) (Calcium Fluoride (CaF2)) — mineral

Fluorite (Polished Point/Tower)

Calcium Fluoride (CaF2)

Quartzite Cobble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Cobble

Quartzite (primarily SiO2)

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

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Polished brown jasper (likely brecciated or orbicular jasper) (Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions) — gemstone

Polished brown jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

Chert (Chalcedony/Agate variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Chalcedony/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (specifically Flint or Jasper variant) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Quartz with inclusions (Silicon Dioxide (SiO2)) — mineral

Quartz with inclusions

Silicon Dioxide (SiO2)

Pyrite (Iron Disulfide (FeS2)) — Mineral

Pyrite

Iron Disulfide (FeS2)

Blue Schist / Lydian Stone / Chert with Glaucophane (Metamorphic rock containing quartz and glaucophane) — metamorphic

Blue Schist / Lydian Stone / Chert with Glaucophane

Metamorphic rock containing quartz and glaucophane

Mica Schist with Vein (Mica Schist) — metamorphic

Mica Schist with Vein

Mica Schist

Gneiss with Quartz Vein (Metamorphic Gneiss) — metamorphic

Gneiss with Quartz Vein

Metamorphic Gneiss

Porphyritic Basalt or Spotted Pebble (Porphyritic volcanic rock with phenocrysts) — igneous

Porphyritic Basalt or Spotted Pebble

Porphyritic volcanic rock with phenocrysts

Porphyritic Basalt or Porphyritic Andesite (Porphyritic Extrusive Igneous Rock) — igneous

Porphyritic Basalt or Porphyritic Andesite

Porphyritic Extrusive Igneous Rock

Fossiliferous Chert (Brachiopod/Bryozoan Fossil) (Microcrystalline quartz (SiO2) with fossil inclusions) — sedimentary

Fossiliferous Chert (Brachiopod/Bryozoan Fossil)

Microcrystalline quartz (SiO2) with fossil inclusions

Silver Nuggets (Natural or Cast) (Native Silver (Ag)) — mineral

Silver Nuggets (Natural or Cast)

Native Silver (Ag)

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Limonite (Ironstone Concretion) (Limonite (FeO(OH)·nH2O)) — mineral

Limonite (Ironstone Concretion)

Limonite (FeO(OH)·nH2O)

Sandstone (Banded) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (Banded)

Clastic sedimentary rock (primarily SiO2)

Petrified Wood (Silicified Fossil) (Silicified Wood (SiO2)) — sedimentary

Petrified Wood (Silicified Fossil)

Silicified Wood (SiO2)

Petrified Wood (Silicified wood (Quartz variant, SiO2)) — sedimentary

Petrified Wood

Silicified wood (Quartz variant, SiO2)

Dyed Quartz Geode (Silicon Dioxide (SiO2) with artificial pigment) — mineral

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

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

Chert (often called Jasper or Flint)

Microcrystalline Quartz (SiO2)

Chert (Grey-Green Flint) (Microcrystalline silicon dioxide (SiO2)) — sedimentary

Chert (Grey-Green Flint)

Microcrystalline silicon dioxide (SiO2)

Amethyst Geode (Silicon Dioxide with trace inclusions of Iron (SiO2)) — mineral

Amethyst Geode

Silicon Dioxide with trace inclusions of Iron (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

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

Chert (Flint variety)

Silicon Dioxide (SiO2)

Chert in Limestone (or Flint Nodule) (Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert in Limestone (or Flint Nodule)

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Opalite crescent pendant (Opalite (man-made opalescent glass; not a natural mineral)) — gemstone

Opalite crescent pendant

Opalite (man-made opalescent glass; not a natural mineral)

Clear Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Mahogany Obsidian (Volcanic Glass (SiO2 + Fe2O3)) — igneous

Mahogany Obsidian

Volcanic Glass (SiO2 + Fe2O3)

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

Chert (Black Flint)

Silicon Dioxide (SiO2)

Red Coral (Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)) — Mineraloid (Organic Gemstone)

Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)

Mineraloid (Organic Gemstone)

Chert Concretion (Silicon dioxide (SiO2)) — sedimentary

Chert Concretion

Silicon dioxide (SiO2)

Pink Granite (Water-worn Cobble) (Phaneritic Felsic Intrusive Igneous Rock) — igneous

Pink Granite (Water-worn Cobble)

Phaneritic Felsic Intrusive Igneous Rock

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Quartz (Rock Crystal) with minor impurities (Quartz (SiO2)) — Mineral

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Quartz Vein in Gneiss or Schist (Silicon dioxide (SiO2) within metamorphic host rock) — metamorphic

Quartz Vein in Gneiss or Schist

Silicon dioxide (SiO2) within metamorphic host rock

Snowflake Obsidian (Volcanic Glass (SiO2) with Cristobalite inclusions) — igneous

Snowflake Obsidian

Volcanic Glass (SiO2) with Cristobalite inclusions