Rock Identifier

Category

Sedimentary Or Igneous (Secondary Formation)

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

Red Sandstone (Arenite (primarily Quartz with Hematite cement)) — sedimentary

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Marble (Recrystallized Carbonate Rock (CaCO3)) — metamorphic

Marble

Recrystallized Carbonate Rock (CaCO3)

Obsidian and Phantom Quartz (Volcanic Glass (SiO2 + MgO + Fe3O4) and Crystalline Quartz (SiO2)) — igneous and mineral

Obsidian and Phantom Quartz

Volcanic Glass (SiO2 + MgO + Fe3O4) and Crystalline Quartz (SiO2)

igneous and mineral

Carnelian (Carnelian (subset of Chalcedony); SiO2 with Iron Oxide impurities) — mineral

Carnelian

Carnelian (subset of Chalcedony); SiO2 with Iron Oxide impurities

Red Sandstone (Arenite (ferruginous sandstone)) — sedimentary

Red Sandstone

Arenite (ferruginous sandstone)

Jasper with Quartz inclusions (Silicon Dioxide (SiO2) - Microcrystalline Chalcedony) — sedimentary

Jasper with Quartz inclusions

Silicon Dioxide (SiO2) - Microcrystalline Chalcedony

Chert (Brecciated or Veined) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Brecciated or Veined)

Silicon Dioxide (SiO2)

Red Jasper (Silicon Dioxide (SiO2) with Hematite (Fe2O3) impurities) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) impurities

Basalt (Basalt (a mafic extrusive igneous rock)) — Igneous

Basalt

Basalt (a mafic extrusive igneous rock)

Hematite (beads) (Hematite (Fe₂O₃)) — Mineral

Hematite (beads)

Hematite (Fe₂O₃)

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Mookaite Jasper (Silicon Dioxide (SiO2) with iron oxide impurities) — sedimentary

Mookaite Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Red Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Fulgurite (Fulgurite (Lechatelierite-rich fused silica)) — mineraloid / sedimentary (secondary formation)

Fulgurite

Fulgurite (Lechatelierite-rich fused silica)

mineraloid / sedimentary (secondary formation)

Milky Quartz (with potential inclusion of feldspar) (Silicon Dioxide (SiO2)) — Mineral

Milky Quartz (with potential inclusion of feldspar)

Silicon Dioxide (SiO2)

Moonstone (Potassium Aluminum Silicate (KAlSi3O8)) — mineral

Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Rose Quartz (Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese) — mineral

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Garnet (likely Almandine or Pyrope) (Garnet Group (Fe3Al2Si3O12 or Mg3Al2Si3O12)) — mineral

Garnet (likely Almandine or Pyrope)

Garnet Group (Fe3Al2Si3O12 or Mg3Al2Si3O12)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (likely) (Quartz (SiO2 - Silicon Dioxide)) — Mineral

Quartz (likely)

Quartz (SiO2 - Silicon Dioxide)

Sandstone (Arenite (SiO2, often with CaCO3 or Fe2O3 cement)) — sedimentary

Sandstone

Arenite (SiO2, often with CaCO3 or Fe2O3 cement)

Rutilated Quartz (Quartz (SiO2) with Rutile (TiO2) inclusions) — Mineral

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Sandstone (with Iron Staining) (Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)) — sedimentary

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)

Sandstone (Pebble/Cobble) (Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)) — Sedimentary

Sandstone (Pebble/Cobble)

Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

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

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Red Jasper (Silicon Dioxide (SiO2) with Iron inclusions) — mineral

Red Jasper

Silicon Dioxide (SiO2) with Iron inclusions

Garnet Schist (Almandine-Garnet Mica Schist) — metamorphic

Garnet Schist

Almandine-Garnet Mica Schist

Fluorite (likely Green Fluorite variant) (Calcium Fluoride (CaF2)) — mineral

Fluorite (likely Green Fluorite variant)

Calcium Fluoride (CaF2)

Quartz (on matrix) (Quartz (Silicon Dioxide, SiO₂)) — Mineral

Quartz (on matrix)

Quartz (Silicon Dioxide, SiO₂)

Granite (Phaneritic plutonic rock (dominated by Quartz, Feldspar, and Mica)) — igneous

Granite

Phaneritic plutonic rock (dominated by Quartz, Feldspar, and Mica)

Porphyry (Porphyritic Rhyolite or Andesite) — igneous

Porphyry

Porphyritic Rhyolite or Andesite

Granite (weathered cobble) (Granite) — igneous

Granite (weathered cobble)

Granite

Chert (specifically a stream-worn Chert Nodule) (Sedimentary Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (specifically a stream-worn Chert Nodule)

Sedimentary Cryptocrystalline Quartz (SiO2)

Yellow Quartz (Citrine-colored Quartz Pebble) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine-colored Quartz Pebble)

Silicon Dioxide (SiO2)

Porphyritic Basalt (Amygdaloidal) (Porphyritic Mafic Volcanic Rock (Amygdaloidal Basalt)) — igneous

Porphyritic Basalt (Amygdaloidal)

Porphyritic Mafic Volcanic Rock (Amygdaloidal Basalt)

Chert (Tan/Grey variety) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Tan/Grey variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

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

Chert (Banded)

Chert (Microcrystalline Silicon Dioxide, SiO2)

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

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)