Chert (Yellow or Tan Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Secondary Classification For A Weathered Mineral Specimen)
Browse sedimentary (secondary classification for a weathered mineral specimen) specimens identified by the Rock Identifier community.
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Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Granite Water-Worn Pebble
Intermediate to Felsic Phaneritic Igneous Rock
igneous
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Copper Nugget
Native Copper (Cu)
mineral
Yellow Sapphire
Corundum (Al2O3) with iron impurities
mineral
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Dalmatian Stone
Dalmatian Jasper (a misnomer) / Perthitic Feldspar Rock
igneous
Agate Geode Slice (with Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz-veined Siltstone
Siltstone with Quartz (SiO2) veins
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper-rich)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Azurite and Malachite
Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2(CO3)(OH)2)
mineral
Limonite (Bog Iron)
Limonite (Hydrated iron(III) oxide-hydroxide) - FeO(OH)·nH2O
mineral
River Quartz Cobble
Silicon Dioxide (SiO2)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Dioptase
Dioptase (CuSiO3 · H2O)
mineral
Vesicular Basalt with Epidote/Amygdaloidal Basalt
Amygdaloidal Basalt (Mg, Fe)2SiO4 + Ca2(Al, Fe)3(SiO4)3(OH)
igneous
Basalt with Quartz/Feldspar Inclusion
Basalt (containing Silicate minerals such as SiO2 and (Ca,Na)(Al,Si)4O8)
igneous
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Chert (Jasper-like Siliceous Rock)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Jasper variety)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Coquina (Hag Stone variant)
Biocalcarenite (Coquina)
sedimentary
Chert (Jasper/Quartzite river pebble)
Microcrystalline Silica (SiO2)
sedimentary
Chert (Jasper-bearing)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble (often referred to as 'Sea Glass' or 'River Stone' when worn smooth)
Silicon Dioxide (SiO2)
mineral
Pink Calcite (Mangano Calcite)
Calcium Carbonate (CaCO3)
mineral
Chert (Septarian Nodules / Weathered Silex)
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Quartzite (also known as Ironstone or Gossan)
Ferruginous Quartzite with Goethite/Hematite staining
metamorphic
Granite (Weathered)
Phaneritic Felsic Igneous Rock
Igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Pink Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone with Secondary Mineralization
Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper/Flint Pebble)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Brecciated Chert
Brecciated Chert (Microcrystalline Quartz, SiO2)
sedimentary
Quartz (Sand Grain size)
Silicon Dioxide (SiO2)
mineral
Quartz (Microcrystalline Gravel)
Silicon Dioxide (SiO2)
mineral