Quartz Geode
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary (Secondary Classification: Cryptocrystalline Quartz)
Browse sedimentary (secondary classification: cryptocrystalline quartz) specimens identified by the Rock Identifier community.
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Epidote in Quartz
SiO2 with Ca2Al2(Fe3+,Al)(SiO4)3(OH)
mineral
Shiva Lingam
Cryptocrystalline Quartz (Jasper/Agate)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Tumbled yellow chalcedony (likely citrine or yellow jasper)
Microcrystalline quartz, SiO₂; exact identification requires testing
mineral
Agate and Amethyst (Quartz variants)
Silicon Dioxide (SiO2) - Microcrystalline Quartz and Crystalline Quartz
mineral
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
Mineral / Sedimentary
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Shiva Lingam Stone
Cryptocrystalline Quartz (Jasper/Basalt matrix)
sedimentary
Banded Iron Formation (BIF) with Quartz
Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)
Sedimentary
Chalcedony / Agate Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Limonitic Sandstone with Inclusion
Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Jasper
Chalcedony (Microcrystalline Quartz) - SiO2
sedimentary or metamorphic
Orange Quartzite (or Yellow Jasper / Carnelian Chalcedony)
Silicon Dioxide (SiO2)
metamorphic
Red Jasper (possibly Mookaite)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities, microcrystalline quartz
sedimentary
K2 Jasper (K2 Granite)
Granite with Azurite inclusions (SiO2 + Cu3(CO3)2(OH)2)
igneous
Liesegang Stone (Sandstone with Liesegang Rings)
Clastic sedimentary rock with li-secondary iron oxide mineralization
sedimentary
Dyed Agate
Chalcedony (SiO2)
Mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
Mineral
Jasper with Quartz Vein
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Chert (often colloquially called Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert or flint fragment
Microcrystalline quartz (SiO₂), commonly called chalcedony or flint
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities (mostly Iron Oxides)
sedimentary
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Chert with Quartz Vein
Microcrystalline Quartz (SiO2) with Macrocrystalline Quartz
sedimentary
Quartz-veined Sandstone Pebble
Quartzite-veined Arenite
sedimentary
Quartz Nodule / Agate Geode
Silicon Dioxide (SiO2)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2)
mineral
Banded Sedimentary Rock
Sedimentary rock with Liesegang banding
sedimentary
Jasper with Quartz Vein
Microcrystalline quartz (SiO2) with quartz infill
sedimentary
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Goethite/Limonite inclusions
mineral
Chert (Nodule fragment)
Silicon Dioxide (SiO2)
sedimentary
Chert (Common Opal/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite with Quartz Vein
Quartzite (primarily SiO2)
metamorphic
Chert Arrowhead (Projectile Point)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Quartz Geode Pebble
Silicon Dioxide (SiO2)
sedimentary
Chert (Pink/Tan variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary