Quartzite Pebbles with Quartz Veining
SiO2 (Silicon Dioxide with country rock matrix)
metamorphic
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.
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Polished orbicular granite (likely gabbroic granite)
Granite, chiefly quartz (SiO₂), feldspar, and biotite/amphibole; exact variety uncertain from the photograph
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Leopard Skin Jasper
Silicon Dioxide (SiO2) with iron and manganese inclusions
sedimentary
Granite (specifically the Ubatuba variety)
Phaneritic Igneous Rock (Granodiorite/Monzogranite)
igneous
Yellow Chalcedony (Carnelian / Agate Pebbles)
Silicon Dioxide (SiO2)
mineral
Jasper (Chert / Chalcedony)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Veined Limestone
Sedimentary Calcite-Veined Rock (CaCO3)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled brown mineral/rock specimen
Indeterminate from image; likely brown jasper, chert, or iron-stained quartzite
mineral
Tree Agate
Quartz (SiO2) with Chlorite/Hornblende inclusions
mineral
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Rounded quartz-rich pebble
Likely microcrystalline quartz (SiO₂), possibly milky quartz or a pale quartzite fragment
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Satin Spar (Selenite)
Gypsum (CaSO4·2H2O)
mineral
Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Banded Sedimentary Rock
Sedimentary Rock with Quartz/Feldspar Vein
sedimentary
Iron-stained quartz fragment (probable quartzite or chert)
Quartz, SiO₂; possibly iron-oxide-stained microcrystalline silica
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Banded jasper (likely brecciated jasper)
Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral impurities
sedimentary
Sandstone (Weathered / Crushed)
Quartz Sandstone
sedimentary
Chert (Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Chert (variously Flints)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Likely red jasper or iron-rich chert
Microcrystalline quartz (SiO₂) colored by hematite/goethite
sedimentary
Chert / River Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz (or Chert/Flint)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (Quartz variety, SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2 with chlorite inclusions)
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron inclusions
mineral
Veined Sandstone with Calcite Veins
Sedimentary sandstone with hydrothermal/mineral veins
sedimentary
Chert (River Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Chalcedony/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
White Opal (Common)
Hydrated Silica (SiO2·nH2O)
mineral
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary