Rock Identifier

Category

Sedimentary Or Igneous (Secondary Formation)

Browse sedimentary or igneous (secondary formation) specimens identified by the Rock Identifier community.

Learn about Sedimentary Or Igneous (Secondary Formation) in the encyclopedia

Banded Iron Formation

Banded Iron Formation

Itabirite

Jaspillite

Carbonatite

Conglomerate

Quartzite Sandstone

Quartzite Sandstone

Breccia

Ironstone

Lamproite

Troctolite

Basalt

Gabbro

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Honey Calcite (Calcium Carbonate (CaCO3)) — mineral

Honey Calcite

Calcium Carbonate (CaCO3)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Chalcedony (Moonstone variant or White Agate) (Silicon Dioxide (SiO₂)) — mineral

Chalcedony (Moonstone variant or White Agate)

Silicon Dioxide (SiO₂)

Chalcedony (Agate/Carnelian variant) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate/Carnelian variant)

Silicon Dioxide (SiO2)

Quartz Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Likely quartz-rich stone (possibly milky quartz or quartzite) (Quartz, silicon dioxide (SiO₂), or quartzite if interlocking grains are present) — mineral

Likely quartz-rich stone (possibly milky quartz or quartzite)

Quartz, silicon dioxide (SiO₂), or quartzite if interlocking grains are present

Waterworn pebble, possibly iron-rich basalt or river stone (Unidentified lithic clast; composition cannot be determined reliably from the image) — igneous

Waterworn pebble, possibly iron-rich basalt or river stone

Unidentified lithic clast; composition cannot be determined reliably from the image

Vesicular Basalt (or Porphyritic Scoria) (Vesicular Basalt) — igneous

Vesicular Basalt (or Porphyritic Scoria)

Vesicular Basalt

Vesicular basalt (possibly weathered scoria) (Basaltic volcanic rock; chiefly plagioclase, clinopyroxene, and Fe–Mg oxides, with vesicles from trapped gas) — igneous

Vesicular basalt (possibly weathered scoria)

Basaltic volcanic rock; chiefly plagioclase, clinopyroxene, and Fe–Mg oxides, with vesicles from trapped gas

Sandstone (Arenite (primary component SiO2)) — sedimentary

Sandstone

Arenite (primary component SiO2)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color) (Calcite) — Mineral

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)

Calcite

Geode (Quartz nodule / Chalcedony-lined cavity) — sedimentary

Geode

Quartz nodule / Chalcedony-lined cavity

Quartz Geode (Quartz (Silicon Dioxide, SiO2) Geode) — sedimentary

Quartz Geode

Quartz (Silicon Dioxide, SiO2) Geode

Rounded river pebble, likely quartz-rich sandstone or weathered igneous rock (Indeterminate; possibly quartzite, sandstone, or fine-grained granitic rock) — igneous

Rounded river pebble, likely quartz-rich sandstone or weathered igneous rock

Indeterminate; possibly quartzite, sandstone, or fine-grained granitic rock

Prehnite (Prehnite (Ca2Al2Si3O10(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Gneiss (with Garnet) (Gneiss (Feldspar-Quartz-Biotite-Garnet Metamorphic Rock)) — metamorphic

Gneiss (with Garnet)

Gneiss (Feldspar-Quartz-Biotite-Garnet Metamorphic Rock)

Fluorite with Quartz coating (Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)) — mineral

Fluorite with Quartz coating

Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

Quartz (Citrine / Yellow Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Citrine / Yellow Quartz)

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

River Pebble (likely Quartzite or Chert) (Sedimentary Clast (Silicon Dioxide dominant)) — sedimentary

River Pebble (likely Quartzite or Chert)

Sedimentary Clast (Silicon Dioxide dominant)

Quartz with inclusions (SiO2) — mineral

Quartz with inclusions

SiO2

Small white mineral fragment (Indeterminate; possibly quartz, calcite, or feldspar) — mineral

Small white mineral fragment

Indeterminate; possibly quartz, calcite, or feldspar

Basalt (Basalt) — igneous

Basalt

Basalt

Banded quartz-rich metamorphic rock (likely quartzite or quartz-mica schist) (Quartzite/schist composed chiefly of SiO₂ quartz with mica, feldspar, and iron-oxide or copper-colored accessory minerals) — metamorphic

Banded quartz-rich metamorphic rock (likely quartzite or quartz-mica schist)

Quartzite/schist composed chiefly of SiO₂ quartz with mica, feldspar, and iron-oxide or copper-colored accessory minerals

Red Jasper (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Limonite (Iron Ore) (Limonite (Hydrous iron(III) oxide-hydroxide mixture, FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

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

K2 Jasper (K2 Granite) (Azurite in Granite (Biotite Granite containing Azurite)) — igneous

K2 Jasper (K2 Granite)

Azurite in Granite (Biotite Granite containing Azurite)

Polished garnet-bearing gneiss (Biotite-quartz-feldspar gneiss with almandine garnet (garnet: Fe₃Al₂(SiO₄)₃)) — metamorphic

Polished garnet-bearing gneiss

Biotite-quartz-feldspar gneiss with almandine garnet (garnet: Fe₃Al₂(SiO₄)₃)

Diamond (Carbon (C)) — gemstone

Diamond

Carbon (C)

Garnet in Host Rock (Garnet Group (A3B2(SiO4)3)) — metamorphic

Garnet in Host Rock

Garnet Group (A3B2(SiO4)3)

Rhodochrosite (Manganese Carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese Carbonate (MnCO3)

Small rounded pebble, likely quartz-rich sandstone or granitic fragment (Indeterminate lithic clast; possible quartz–feldspar aggregate) — igneous

Small rounded pebble, likely quartz-rich sandstone or granitic fragment

Indeterminate lithic clast; possible quartz–feldspar aggregate

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

Quartz (Citrine or Iron-Stained variety)

Silicon Dioxide (SiO2)

Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)

Clear Quartz (Quartz (Silicon Dioxide, SiO2)) — Mineral

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Porphyritic basalt (likely amygdaloidal basalt) (Basalt, a mafic volcanic rock; composition typically plagioclase + pyroxene, with possible olivine and vesicle-filling minerals) — igneous

Porphyritic basalt (likely amygdaloidal basalt)

Basalt, a mafic volcanic rock; composition typically plagioclase + pyroxene, with possible olivine and vesicle-filling minerals