Chert (Flint)
Chert (SiO2)
sedimentary
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Possible iron-rich concretion or weathered ironstone
Goethite/limonite-rich ironstone; exact identification requires testing
mineral
Mica Schist
Medium-grade regional metamorphic rock (composition varies)
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Weathered iron-rich concretion or laterite fragment
Ferruginous concretion, likely goethite/limonite (hydrated iron oxides) in a clay-rich matrix
sedimentary
Weathered iron-rich rock, possibly laterite or limonite-bearing sandstone
Laterite/limonite-rich material; commonly dominated by goethite (FeO(OH)) and hydrated iron oxides
sedimentary
Anthracite Coal
Anthracite
sedimentary
Anthracite Coal
Anthracite
sedimentary
Banded Flint (Polished Stripe Flint)
Silicon Dioxide (SiO2) - variety of Chert
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper (with Quartz veining)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Sandstone
Arenite (Sedimentary rock)
sedimentary
Quartz Vein in Host Rock
Crystalline Silicon Dioxide (SiO2) in Pelitic or Shaly Matrix
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Red jasper
Microcrystalline quartz (SiO₂), iron-oxide-rich chalcedony
mineral
Sandstone
Arenite (Silicon Dioxide with various mineral cements)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Smoky Quartz (Tumbled)
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Diamond
Native Carbon (C)
mineral
Epidote in Quartz
Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) in Milky Quartz (SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Schist
Mica Schist
metamorphic
Sapphire (Blue/Violet Rough)
Corundum (Al2O3)
gemstone
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Corundum (Ruby/Sapphire crystal)
Al2O3 (Aluminum Oxide)
mineral
Basalt
Basalt (Mainly Plagioclase Feldspar and Pyroxene)
igneous
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variations include Flint/Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Chert / Flint Variety)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Iron-rich quartzite or ironstone fragment
Quartzite dominated by quartz (SiO₂), with iron oxides such as hematite/goethite
metamorphic
Diamond
Native Carbon (C)
mineral
Dendritic Siltstone
Siltstone with Manganese Dendrites (MnO2)
sedimentary
Vesicular Basalt
Extrusive mafic igneous rock (primarily Plagioclase feldspar and Pyroxene)
igneous
Erythrite (or Lab-Grown Cobaltite/Cinnabar Analog)
Erythrite (Co3(AsO4)2·8H2O)
mineral