Rock Identifier

Category

Mineraloid (Human Made Geological Specimen)

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

Quartz (Iron-Stained or Milky) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-Stained or Milky)

Silicon Dioxide (SiO2)

mineral
Quartz (Small Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (Small Pebble)

Silicon Dioxide (SiO2)

mineral
Fossilized cylindrical shell or bone fragment (Indeterminate biogenic carbonate or phosphatic fossil; possible fragment of a tubular shell (e.g., scaphopod) or hollow bone) — fossil

Fossilized cylindrical shell or bone fragment

Indeterminate biogenic carbonate or phosphatic fossil; possible fragment of a tubular shell (e.g., scaphopod) or hollow bone

fossil
Biotite Schist (Biotite Schist (containing K(Mg,Fe)3AlSi3O10(OH)2)) — metamorphic

Biotite Schist

Biotite Schist (containing K(Mg,Fe)3AlSi3O10(OH)2)

metamorphic
Chert with Calcite Veining (Microcrystalline Quartz (SiO2) with Calcium Carbonate (CaCO3) veins) — sedimentary

Chert with Calcite Veining

Microcrystalline Quartz (SiO2) with Calcium Carbonate (CaCO3) veins

sedimentary
Pegmatite containing Muscovite and Quartz (Granitic Pegmatite (SiO2 with KAl2(AlSi3O10)(OH)2)) — igneous

Pegmatite containing Muscovite and Quartz

Granitic Pegmatite (SiO2 with KAl2(AlSi3O10)(OH)2)

igneous
Banded Iron Formation (Tiger Iron variant) (Banded Iron Formation (SiO2 + Fe2O3)) — sedimentary

Banded Iron Formation (Tiger Iron variant)

Banded Iron Formation (SiO2 + Fe2O3)

sedimentary
Chert Nodules in Limestone (Cryptocrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert Nodules in Limestone

Cryptocrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

sedimentary
Fossiliferous Siltstone (Clastic Sedimentary Rock with Fossil Inclusions) — sedimentary

Fossiliferous Siltstone

Clastic Sedimentary Rock with Fossil Inclusions

sedimentary
Quartz Vein in Sandstone (Sandstone with Hydrothermal Quartz (SiO2)) — sedimentary

Quartz Vein in Sandstone

Sandstone with Hydrothermal Quartz (SiO2)

sedimentary
Limonite (Ironstone) (Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)) — mineral

Limonite (Ironstone)

Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)

mineral
Banded Gneiss (Gneiss (High-grade Regional Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

metamorphic
Mookaite Jasper (Radiolarite (Silicified radiolarian chert)) — sedimentary

Mookaite Jasper

Radiolarite (Silicified radiolarian chert)

sedimentary
Sandstone (Ferruginous) (Arenite (with Iron Oxide cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

sedimentary
White Quartz (Silicon Dioxide (SiO2)) — mineral

White Quartz

Silicon Dioxide (SiO2)

mineral
Quartz chunk (Silicon dioxide (SiO2)) — mineral

Quartz chunk

Silicon dioxide (SiO2)

mineral
Dendritic Agate or Spotted Quartzite (Silicon Dioxide (SiO2) with inclusions) — metamorphic

Dendritic Agate or Spotted Quartzite

Silicon Dioxide (SiO2) with inclusions

metamorphic
Chert with Limestone (Microcrystalline Quartz (SiO2) in Calcium Carbonate (CaCO3) matrix) — sedimentary

Chert with Limestone

Microcrystalline Quartz (SiO2) in Calcium Carbonate (CaCO3) matrix

sedimentary
Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

mineral
Titanium Aura Quartz (Titanium bonded Silicon Dioxide (SiO2 + Ti)) — mineral

Titanium Aura Quartz

Titanium bonded Silicon Dioxide (SiO2 + Ti)

mineral
Quartz (Smoky/Milky variant) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Milky variant)

Silicon Dioxide (SiO2)

mineral
Chert (often called Flint in archaeological contexts) (Microcrystalline or cryptocrystalline Silica (SiO2)) — sedimentary

Chert (often called Flint in archaeological contexts)

Microcrystalline or cryptocrystalline Silica (SiO2)

sedimentary
Banded agate (likely green jasper/agate pebble) (Microcrystalline quartz, SiO₂, with iron- and chlorite-rich inclusions) — mineral

Banded agate (likely green jasper/agate pebble)

Microcrystalline quartz, SiO₂, with iron- and chlorite-rich inclusions

mineral
Hematoid Quartz (Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)) — mineral

Hematoid Quartz

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

mineral
Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

mineral
Fossiliferous Shale (Fossiliferous Mudstone / Shale) — sedimentary

Fossiliferous Shale

Fossiliferous Mudstone / Shale

sedimentary
Pyrite (Iron Disulfide (FeS2)) — mineral

Pyrite

Iron Disulfide (FeS2)

mineral
Flint (SiO2 (Cryptocrystalline Quartz)) — sedimentary

Flint

SiO2 (Cryptocrystalline Quartz)

sedimentary
Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

mineral
Biotite-rich granite or granitic gneiss (Granite; quartz–feldspar–biotite assemblage) — igneous

Biotite-rich granite or granitic gneiss

Granite; quartz–feldspar–biotite assemblage

igneous
Ambergris (Geological/Organic Specimen) (Ambra grisea (Produced by Physeter macrocephalus)) — organic material

Ambergris (Geological/Organic Specimen)

Ambra grisea (Produced by Physeter macrocephalus)

organic material
Crinoid and Coral Fossils in Limestone (Fossiliferous Limestone with Rugosa (order) and Crinoidea (class)) — sedimentary

Crinoid and Coral Fossils in Limestone

Fossiliferous Limestone with Rugosa (order) and Crinoidea (class)

sedimentary
Placer Gold Nugget (Native Gold (Au)) — mineral

Placer Gold Nugget

Native Gold (Au)

mineral
Jasper and Agate (Polished Pebble) (Chalcedony (SiO2 with impurities)) — Sedimentary

Jasper and Agate (Polished Pebble)

Chalcedony (SiO2 with impurities)

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

Chert / Flint

Cryptocrystalline quartz (SiO2)

sedimentary
River Pebbles (Chert and Quartzite) (Sedimentary Clastic Rock (Silica-rich)) — sedimentary

River Pebbles (Chert and Quartzite)

Sedimentary Clastic Rock (Silica-rich)

sedimentary
Carnelian (Silicon dioxide (chalcedony variety), SiO2) — gemstone

Carnelian

Silicon dioxide (chalcedony variety), SiO2

gemstone
Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Banded gneiss (likely amphibolite-rich gneiss) (Banded gneiss; composition commonly quartz, feldspar, mica and/or amphibole) — metamorphic

Banded gneiss (likely amphibolite-rich gneiss)

Banded gneiss; composition commonly quartz, feldspar, mica and/or amphibole

metamorphic
Mixed Rock Collection (Pebbles and Stones) (Various geological specimens) — igneous, sedimentary, and metamorphic

Mixed Rock Collection (Pebbles and Stones)

Various geological specimens

igneous, sedimentary, and metamorphic
Tumbled quartz pebble (Quartz (SiO₂), likely milky or fractured rock crystal) — mineral

Tumbled quartz pebble

Quartz (SiO₂), likely milky or fractured rock crystal

mineral
Milky quartz (quartz-rich rock fragment) (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz (quartz-rich rock fragment)

Quartz, silicon dioxide (SiO₂)

mineral