Tumbled orange-brown jasper
Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides
mineral
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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Chert (specifically Flint or Dark Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Yellow Quartz (Chalcedony or Agate)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Matrix (Breccia / Host Rock with Quartz)
Silicon Dioxide (SiO2) in Host Rock Matrix
metamorphic
River Rock (Mossy)
Stream-rounded Clast (likely Siltstone or Sandstone with bryophytes)
sedimentary
Jasper and Chalcedony
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Dendritic Agate or Tree Agate
Silicon Dioxide (SiO2) with impurities of manganese or iron oxide
mineral
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Chert (Gravel Bit)
Microcrystalline silica (SiO2)
sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Small polished white pebble, possibly quartz or chalcedony
Likely microcrystalline quartz (SiO₂), but the image is insufficient for confident identification
mineral
Sandstone Pebble
Sedimentary quartz arenite
sedimentary
Quartz-lined geode
Silica geode; predominantly microcrystalline quartz (SiO₂), possibly chalcedony
mineral
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Bumble Bee Jasper
Calcite and Volcanic Ash Mixture
sedimentary
River Pebble
Siliceous rock fragment / Quartzite / Sandstone pebble
sedimentary
Chert (River Pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Fancy Jasper
Chalcedony (cryptocrystalline quartz) with inclusions
Mineral
Quartzite Pebble (with mineral veining)
Metamorphic Quartzite (SiO2)
metamorphic
Quartz-rich gneiss
Foliated quartz–feldspar–mica gneiss, possibly migmatitic
metamorphic
Tumbled jasper or weathered chert
Microcrystalline quartz (SiO₂), likely jasper/chert with iron-oxide impurities
mineral
Chert (containing Quartz)
Microcrystalline Silica (SiO2)
sedimentary
Geode
Crystalline Quartz in Sedimentary Matrix (SiO2)
sedimentary
Sandstone Pebble
Quartz Sandstone
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (Yellow Agate / Carnelian Chalcedony)
Silicon Dioxide (SiO2)
mineral
Agate (Grey Agate Slice)
Microcrystalline Quartz (SiO2)
mineral
Chert with Iron Oxide Staining
Microcrystalline Quartz (SiO2) with Limonite/Goethite staining
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (River Cobble / Pebble)
Sedimentary Rock (Quartz Sandstone / Arenite)
sedimentary
Chert (varieties include Flint and Jasper)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Jasper with Quartz Veins
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
mineral
Chalcedony (Agate/Common Opal blend)
Microcrystalline Quartz (SiO2)
mineral
Green Aventurine
Silicon dioxide (SiO2) with fuchsite inclusions
mineral
Banded Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Flint
SiO2 (Microcrystalline Quartz / Chert)
sedimentary
Chert (White-Tan variety)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Polished brecciated jasper
Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide staining and angular mineral fragments
metamorphic