Mineral, Often Found As Detrital Grains In Sedimentary Rocks

Browse mineral, often found as detrital grains in sedimentary rocks specimens identified by the Rock Identifier community.

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

sedimentary

Amygdaloidal Rhyolite

Amygdaloidal felsic extrusive rock

igneous

Basalt

Extrusive mafic igneous rock

igneous

Jasper or Chalcedony

Microcrystalline Quartz (SiO2)

sedimentary

Quartzite (or Iron-Stained Quartz Pebble)

Silicon Dioxide (SiO2) with Ferric Oxide inclusions

metamorphic

Picture Jasper

Silicon Dioxide (SiO2) - Opaque Impure Chalcedony

sedimentary

Quartz Druzy on Matrix (with Copper Mineralization)

Silicon Dioxide (SiO2) with Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O)

mineral

Chert (Iron-Stained)

Microcrystalline or cryptocrystalline Quartz (SiO2)

sedimentary

Diabase (also known as Dolerite)

Diabase

igneous

Sandstone

Arenite (primarily SiO2)

sedimentary

Quartz Geode Fragment

Silicon Dioxide (SiO2)

mineral

Corundum

Corundum (Aluminium oxide, Al2O3)

mineral

Fossiliferous Limestone

Calcite (CaCO3) Rich Bio-sedimentary Rock

sedimentary

Schist

Schist (various mineral compositions)

Metamorphic

Jasper with Quartz Vein

Silicon Dioxide (SiO2) with impurities

sedimentary

Limestone with Weathering Rind

Calcium Carbonate (CaCO3) - Bioclastic or Micritic Limestone

sedimentary

Demantoid Garnet on Matrix

Demantoid (variety of Andradite Garnet) - Ca3(Fe3+)2(SiO4)3

mineral

Giallo Ornamental Granite

Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)

igneous

Quartz pebble

Silicon Dioxide (SiO2)

mineral

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

mineral

Carnelian

Carnelian (Microcrystalline Quartz, SiO2)

Mineral

Vesicular Basalt (Amygdaloidal)

Vesicular Basalt (Fe-Mg rich extrusive volcanic rock)

igneous

Yellow Calcite

Calcium Carbonate (CaCO3)

mineral

Corundum

Corundum (Al2O3)

Mineral

Graphite

Graphite (Native Carbon, C)

Mineral

Fluorite (often referred to casually as 'Fluorspar' in industrial contexts)

Fluorite (CaF2)

Mineral

Jasper

Silicon dioxide (SiO2)

sedimentary

Zebra Marble

Metamorphosed Alabaster/Limestone (CaCO3)

metamorphic

Fossiliferous Shale Matrix

Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments

sedimentary

Chert (or Flint)

Chert (cryptocrystalline quartz), SiO2

Sedimentary

Peridot and Citrine Gemstones (in a ring setting)

Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)

mineral

Basalt

Vesicular Basalt

igneous

Chert (specifically Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Banded Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)

metamorphic

Chert / Jasper / Agate (Chalcedony Group)

Microcrystalline Quartz (SiO2)

sedimentary

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

mineral

Concretion or Geode (unbroken)

Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.

Sedimentary rock (specifically a concretion or possibly a geode)