Sandstone (with Concretion)
Arenite / Quartzose Sandstone
sedimentary
Category
Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)
Browse sedimentary rock (technically a microcrystalline quartz mineral aggregate) specimens identified by the Rock Identifier community.
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)
Igneous
African Turquoise (Jasper)
Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)
Rock
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Pink Granite
Felsic intrusive igneous rock
igneous
Chert (Flint Nodules)
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite Pebble (River Rock)
Metamorphic Quartzite (predominantly SiO2)
metamorphic
Basalt with Quartz/Calcite Vein
Amygdaloidal Basalt (matrix) with Mineral Vein filling
igneous
Sandstone Concretion
Clastic Sedimentary Rock (primarily SiO2 with mineral cement)
sedimentary
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral
Yellow Ochre / Limonite
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
White Quartz
Quartz (SiO2)
Mineral
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - stained microcrystalline quartz
sedimentary
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Pink Botswana Agate
Silicon Dioxide (SiO₂), a cryptocrystalline variety of Quartz and Chalcedony
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (variously Flint)
Chert (Microcrystalline or cryptocrystalline Quartz, SiO₂)
sedimentary
Quartzite River Pebble
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral with metamorphic or sedimentary host
Chert (containing Flint and Calcareous inclusions)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) impurities
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone
Arenite/Quartz Arenite
sedimentary
Jasper Conglomerate (Puddingstone)
Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)
sedimentary
Quartzite with Quartz Vein
Quartzite (SiO2)
metamorphic
Quartz Geode (Cracked Open Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2) within a nodule
sedimentary
Quartz
Quartz (SiO₂)
Mineral
Chrysoprase
Chalcedony (cryptocrystalline quartz) with nickel inclusions; SiO2
Mineral
Sand (Construction Grade)
Unconsolidated siliciclastic sediment (primarily SiO2)
sedimentary
Carnelian
Chalcedony (SiO2)
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
mineral
Dalmatian Stone
Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)
igneous
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz (likely Jasper or Chert variety)
Quartz (SiO₂)
Mineral
Basalt with Quartz Veining
Basalt (Mafic Extrusive Igneous Rock) with SiO2 (Silicon Dioxide) veins
igneous