Granodiorite (River Rock / Cobble)
Granodiorite; Phaneritic intrusive igneous rock dominated by plagioclase, quartz, and hornblende/biotite
igneous
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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Chert Pebble (Jasperoid/Flint)
Silicon Dioxide (SiO2) - cryptocrystalline quartz
Sedimentary
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)
mineral
River Cobble (likely Basalt)
Mafic Igneous Rock (Aphanitic)
Igneous
Limonite Concretion
Goethite/Limonite (FeO(OH)·nH2O)
sedimentary
Basalt-Amugydule (Amygdaloidal Basalt)
Aphanitic Mafic Igneous Rock with Vesicle Infillings
igneous
Zircon
Zircon (ZrSiO4)
Mineral
Trilobite Fossil (Flexicalymene)
Flexicalymene ouzregui
sedimentary
Clear Quartz
Silicon dioxide (SiO2)
mineral
Chert (and Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Gossan
Iron-rich regolith (mainly Limonite and Goethite, FeO(OH)·nH2O)
sedimentary
Basalt (River Stone)
Basalt (Extrusive Igneous Rock)
igneous
Chert (Flint/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint for dark variants)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (specifically Flint or Nodular Chert)
Silicon Dioxide (SiO2)
sedimentary
Basalt River Pebble
Basalt (Mafic volcanic rock)
igneous
Sandstone (lithic wacke/arenite)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Yellow Chalcedony or River Jasper
Silicon Dioxide (SiO2)
sedimentary
Banded Quartzite with Epidote and Iron Oxides
Metasedimentary Quartzite (SiO2) with inclusions
metamorphic
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Quartz (Milky or Smoky variant)
Silicon Dioxide (SiO2)
mineral
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (Ferruginous)
Arenite (complex silicate composition with iron oxides)
sedimentary
Jasper with Quartz inclusions
Silicon Dioxide (SiO2) - Microcrystalline Chalcedony
sedimentary
Chalcedony (Yellow Agate/Chert)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon dioxide (SiO2)
sedimentary
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Chert (with potential fossil inclusion)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Botryoidal Hematite (Kidney Ore)
Iron(III) oxide (Fe2O3)
mineral
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
sedimentary
Basalt Pebble
Extrusive mafic igneous rock
igneous