Quartz Pebble (Iron-stained)
Silicon Dioxide (SiO2)
Mineral / Sedimentary setting
Category
Sedimentary (Cryptocrystalline Quartz)
Browse sedimentary (cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (pebble)
Quartz (SiO₂)
Mineral
Quartz Vein in Sedimentary Rock
Silicon Dioxide (SiO2) with host Chert or Limestone
mineral
Chert / Flint (a variety of Chert)
Chert (SiO2)
Sedimentary Rock (technically a microcrystalline quartz mineral aggregate)
Chrysocolla on Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Agate
Silicon Dioxide (SiO2) - Chalcedony variant
mineral
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Banded Iron Formation
Banded Iron Formation (BIF)
Sedimentary Rock
Agate
Silicon dioxide (SiO2) - variety Chalcedony
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Quartzite and Jasper Pebbles
Quartzite (re-crystallized Quartz) and Cryptocrystalline Quartz (SiO2)
metamorphic
Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Mineral, potentially a rock with chalcedony/jasper.
Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
sedimentary
Dzi Bead (Agate)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Tiger's Eye
Silicon dioxide (SiO2) with fibrous inclusions of crocidolite
Mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Lake Superior Agate
Silicon Dioxide (SiO2) - Variety Agate
mineral
Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)
Chalcedony (SiO₂)
Mineral (or mineraloid if microcrystalline)
Red Jasper (River Pebble)
Silicon Dioxide (SiO2) with hematite impurities
sedimentary (microcrystalline quartz)
Conglomerate with Quartz Inclusions
Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)
sedimentary
Chert / Flint
Chert (varieties include Flint)
Sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Banded Agate (specifically sardonyx or carnelian agate variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Dzi Bead (Etched Chalcedony)
Cryptocrystalline Quartz (SiO2) with chemical etching
mineral
Banded Agate (Lake Superior Agate type)
Agate (Cryptocrystalline Variety of Quartz, SiO2)
mineral
Banded Agate (specifically Botswana Agate or Water-line Agate)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Red Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Green Banded Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Banded Agate (Onyx Variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Agate Geode / Thunderegg
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Crazy Lace Agate
Cryptocrystalline Quartz (Silicon Dioxide, SiO2)
mineral
Agate (specifically Lake Superior Agate style or Banded Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Banded Agate (specifically Black Sardonyx/Onyx variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Quartz on Schist
Silicon Dioxide (SiO2) on Foliated Metamorphic Rock
metamorphic
Botryoidal Chalcedony
Chalcedony (SiO2)
Mineral
Agate (Slab)
Agate (Cryptocrystalline variety of Quartz, SiO2)
Mineral
Basalt with Jasper Veining
Basaltic Rock with Cryptocrystalline Quartz (SiO2)
igneous