Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
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.
Learn about Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate) in the encyclopedia
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Grape Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Dendritic Agate (River Pebble)
Silicon Dioxide (SiO2) with Manganese or Iron oxide inclusions
mineral
Dendritic Agate
Dendritic Agate (Silicon Dioxide with Manganese or Iron Oxide inclusions, SiO2)
mineral
Fancy Jasper
Silicon Dioxide (SiO2) with iron and organic inclusions
sedimentary
Tumbled jasper (likely brecciated or red jasper)
Jasper, microcrystalline quartz/chalcedony (SiO₂), colored by iron oxides
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Raw rose quartz
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Geode (Unopened)
Silica Concretion / Geode (Formula: SiO2 for quartz internal contents)
sedimentary
Agate (Carnelian Agate with Quartz Matrix)
Silicon Dioxide (SiO2)
mineral
Leopard Skin Jasper
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Quartzite (or Chert/Flint gravel)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Fossilized wood (petrified wood)
Silicified wood; commonly quartz/chalcedony (SiO₂) replacing wood tissue
fossil
Polished banded agate (likely sardonyx)
Cryptocrystalline chalcedony, SiO₂; reddish bands are iron-stained layers
mineral
Kambaba Jasper
Stromatolite (Fossilized Algae)
sedimentary
Leopard Skin Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Dalmatian Stone
Dalmatian Jasper (Aplite rock composition)
igneous
Kambaba Jasper
Stromatolite (Fossilized Algae)
sedimentary
Dalmatian Jasper (Dalmatian Stone)
Dalmatian Stone (primarily Feldspar, Quartz, and Arfvedsonite/Tourmaline)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Red jasper (iron-rich chert), possibly brecciated
Microcrystalline quartz/chalcedony (SiO₂) colored by hematite and goethite
sedimentary
Dragon Blood Jasper
Epidote-containing Quartz and Chlorite (SiO2 + (Ca2(Al, Fe)3(SiO4)3(OH)))
sedimentary
Banded Agate
Chalcedony (SiO2)
mineral
Zebra Jasper
Tektite variety of Silicon Dioxide (SiO2) with inclusions
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Chert
Microcrystalline or cryptocrystalline quartz
sedimentary
Quartz-lined agate/geode slice
Microcrystalline quartz (chalcedony, SiO₂) with drusy quartz; possibly calcite inclusions
mineral
Zebra Jasper
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
sedimentary
Likely quartz-rich sedimentary pebbles
Quartz arenite or chert-like siliceous rock; exact identification is uncertain from the photograph
sedimentary
Quartz-veined Sedimentary Rock
Hydrothermally veined Clastic Sedimentary Rock (SiO2 veins in Matrix)
sedimentary
Polished brown jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly with iron-oxide impurities
gemstone
Tumbled yellow-brown jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
metamorphic
Travertine
Travertine (CaCO3 - Calcium Carbonate)
sedimentary
Yellow-brown chert or jasper
Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chert/jasper
sedimentary
Bumblebee Jasper
Calcite-bearing Volcanic Tuff containing Sulfur and Arsenic (Orpiment/Realgar)
sedimentary
Chert / Quartzite
Silicon Dioxide (SiO2)
sedimentary
Plume Agate
Cryptocrystalline Quartz (SiO2)
Mineral/Gemstone
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Zebra Jasper
Tetragonal Silicon Dioxide (Quartz) with impurities
sedimentary
Tumbled quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly weathered chert or chalcedony
mineral
Pink Granite
Phaneritic Plutonic Igneous Rock (high K-feldspar)
igneous