Rock Identifier

Category

Sedimentary (Secondary Classification: Cryptocrystalline Quartz)

Browse sedimentary (secondary classification: cryptocrystalline quartz) specimens identified by the Rock Identifier community.

Quartz Vein in Pelite (Metamorphic Rock) (Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)) — metamorphic

Quartz Vein in Pelite (Metamorphic Rock)

Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)

Agate (Water-Worn Pebble) (Silicon Dioxide (SiO2) - Chalcedony) — mineral

Agate (Water-Worn Pebble)

Silicon Dioxide (SiO2) - Chalcedony

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

Quartz

Quartz (SiO₂ - Silicon Dioxide)

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

Limonite (Ironstone Concretion)

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

Quartz (Milky/Common) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Sandstone or Quartzite (Arenite (if sedimentary) / Quartzite (if metamorphic)) — Sedimentary or Metamorphic

Sandstone or Quartzite

Arenite (if sedimentary) / Quartzite (if metamorphic)

Sedimentary or Metamorphic

Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Quartz (Silicon dioxide (SiO₂)) — Mineral

Quartz

Silicon dioxide (SiO₂)

Limestone with Calcite Crystals (Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Calcite Crystals

Calcium Carbonate (CaCO3)

Jasper with Epidote Vein (Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))) — sedimentary

Jasper with Epidote Vein

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))

Quartzite (Hydrothermal Quartz or Quartzite (SiO2)) — metamorphic

Quartzite

Hydrothermal Quartz or Quartzite (SiO2)

Petrified Wood (Silicified wood (Quartz, SiO2)) — metamorphic

Petrified Wood

Silicified wood (Quartz, SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Porphyritic Basalt (Amygdaloidal)

Porphyritic Mafic Volcanic Rock (Amygdaloidal Basalt)

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

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Green Aventurine (Silicon Dioxide (SiO2) with Fuchsite inclusions) — Metamorphic Rock (variety of Quartz)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Metamorphic Rock (variety of Quartz)

Sandstone with Concretions / Liesegang Rings (Arenite with iron oxide banding) — sedimentary

Sandstone with Concretions / Liesegang Rings

Arenite with iron oxide banding

Yellow Aventurine (Yellow Quartz) (Silicon Dioxide (SiO2) with inclusions of Muscovite or Mica) — Mineral (variant of Quartz)

Yellow Aventurine (Yellow Quartz)

Silicon Dioxide (SiO2) with inclusions of Muscovite or Mica

Mineral (variant of Quartz)

Fossiliferous Chert (Chert with Crinoid Stem Impression) (Chert (SiO2) with fossil Anthozoan or Crinoid columnals) — sedimentary

Fossiliferous Chert (Chert with Crinoid Stem Impression)

Chert (SiO2) with fossil Anthozoan or Crinoid columnals

Milky Quartz with Iron Staining (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz (likely Rose Quartz or Milky Quartz based on color) (Quartz (SiO2 - Silicon Dioxide)) — Mineral

Quartz (likely Rose Quartz or Milky Quartz based on color)

Quartz (SiO2 - Silicon Dioxide)

Potassium Feldspar and Quartz (KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)) — mineral

Potassium Feldspar and Quartz

KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)

Chalcedony (Agate/Chert variety) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate/Chert variety)

Silicon Dioxide (SiO2)

Grey Agate (Tumbled) (Silicon Dioxide (SiO2)) — mineral

Grey Agate (Tumbled)

Silicon Dioxide (SiO2)

Basalt with Quartz/Zeolite Inclusions (Porphyritic Basalt (SiO2 with Aluminosilicates)) — igneous

Basalt with Quartz/Zeolite Inclusions

Porphyritic Basalt (SiO2 with Aluminosilicates)

Sandstone (Quartz Sandstone (predominantly)) — Sedimentary

Sandstone

Quartz Sandstone (predominantly)

Flower Agate (Chalcedony (cryptocrystalline Quartz) with Spherulite inclusions; SiO2) — mineral

Flower Agate

Chalcedony (cryptocrystalline Quartz) with Spherulite inclusions; SiO2

Bloodstone (Heliotrope) (Cryptocrystalline Quartz (SiO2) with inclusions of Hematite or Chlorite) — mineral

Bloodstone (Heliotrope)

Cryptocrystalline Quartz (SiO2) with inclusions of Hematite or Chlorite

Banded Agate (Tumbled) (Agate (Silicon Dioxide, SiO2 - Cryptocrystalline Quartz)) — mineral

Banded Agate (Tumbled)

Agate (Silicon Dioxide, SiO2 - Cryptocrystalline Quartz)

Bloodstone (Heliotrope (a variety of Cryptocrystalline Quartz / Jasper, SiO2)) — mineral

Bloodstone

Heliotrope (a variety of Cryptocrystalline Quartz / Jasper, SiO2)

Banded Agate (specifically Sardonyx or Black Agate variety) (Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz) — mineral

Banded Agate (specifically Sardonyx or Black Agate variety)

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Crazy Lace Agate (Agate (Cryptocrystalline Quartz), Silicon Dioxide (SiO2)) — mineral

Crazy Lace Agate

Agate (Cryptocrystalline Quartz), Silicon Dioxide (SiO2)

Sandstone (Ferruginous) (Arenite (with Goethite/Limonite cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (with Goethite/Limonite cement)

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

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

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

Chert (Flint)

Cryptocrystalline Silica (SiO2)

Included Quartz Beads (likely Phantom Quartz or Garden Quartz) (Quartz (SiO2) with various mineral inclusions) — Mineral

Included Quartz Beads (likely Phantom Quartz or Garden Quartz)

Quartz (SiO2) with various mineral inclusions

Sardonyx Agate Sphere (Cryptocrystalline Quartz (SiO2) with iron oxide inclusions) — mineral

Sardonyx Agate Sphere

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Sardonyx Cameo (Silicon Dioxide (SiO2) - variety Cryptocrystalline Quartz) — Mineral

Sardonyx Cameo

Silicon Dioxide (SiO2) - variety Cryptocrystalline Quartz

Aura Quartz Geodes (Lab-Altered) (Silicon Dioxide (SiO2) with Metallic Vapor Deposition) — mineral

Aura Quartz Geodes (Lab-Altered)

Silicon Dioxide (SiO2) with Metallic Vapor Deposition

Ocean Jasper (Orbicular Jasper) (Spherulitic Chalcedony/Rhyolite (SiO2)) — mineral

Ocean Jasper (Orbicular Jasper)

Spherulitic Chalcedony/Rhyolite (SiO2)

Moss Agate (SiO2 (Silicon Dioxide) with dendritic inclusions) — Mineral

Moss Agate

SiO2 (Silicon Dioxide) with dendritic inclusions