Granodiorite
Granodiorite (Intermediate to Felsic Intrusive Rock)
igneous
Category
Mineral (Specifically A Variety Of Quartz)
Browse mineral (specifically a variety of quartz) specimens identified by the Rock Identifier community.
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Agate (specifically, likely a geode slice or nodule)
Agate (a variety of Chalcedony, with chemical formula SiO2)
Mineral
Tumbled amber-colored chalcedony (likely carnelian)
Quartz, microcrystalline SiO₂; orange variety commonly called carnelian
mineral
Banded Agate (specifically Sardonyx or Black Agate variety)
Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz
mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO ₂)
Mineral (specifically a variety of Chalcedony, which is a cryptocrystalline quartz)
Amethyst Lace Agate / Banded Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Red Quartzite
Quartzite (mostly SiO2)
metamorphic
Red Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron Oxide impurities (Hematite)
sedimentary
Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2)
mineral
Chert (specifically a nodule with Chalcendony/Agate banding)
Microcrystalline Quartz (SiO2)
sedimentary
Sunstone (Feldspar variety)
Plagioclase Feldspar (Na,Ca)(Si,Al)3O8 with Hematite/Goethite inclusions
mineral
Desert Rose
Gypsum (variety Selenite) or Baryte, CaSO4 · 2H2O
mineral
Porphyry
Porphyritic Rhyolite or Andesite
igneous
Epidote (Unakite variety)
Epidosite (Metasomatic rock containing Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Red Jasper with Hematite
Impure Microcrystalline Quartz (SiO2) with Hematite (Fe2O3)
sedimentary
Ruby in Fuchsite
Corundum (Al2O3) in Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Chert (Flint variety)
Chert (SiO2)
sedimentary
Chert (Yellow Jasper)
Silicon Dioxide (SiO2)
sedimentary
Fossil Coral
Hexagonaria or Rugose Coral (petoskey stone / fossilized rugose or tabulate coral)
fossil
Red Jasper
Jasper (Silica with Hematite impurities), SiO2
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Peach Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Chert (specifically Agate/Jasper variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
White Jade (Nephrite)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Chrysoprase
Chrysoprase (a variety of Chalcedony, SiO₂)
Mineral
Granite (Pink Orthoclase variety)
Phaneritic intrusive igneous rock (Quartz, Orthoclase, Plagioclase, and Mica)
igneous
Zebra Jasper
Silicon Dioxide (SiO2) with impurities; typically a form of Chalcedony/Microcrystalline Quartz
sedimentary
Sunstone (Oregon Sunstone)
Labradorite (Feldspar variety) - (Ca, Na)(Al, Si)4O8
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint)
Silicon dioxide (SiO2)
sedimentary
Pink Granite
Phaneritic intrusive igneous rock with dominant Alkali Feldspar
igneous
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Chert (Smooth River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Chalcedony/Quartz)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Black Chert or Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Strawberry Quartz
Quartz with Hematite inclusions (SiO2 + Fe2O3)
mineral
Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Conglomerate (Puddingstone)
Conglomerate (specifically, clastic sedimentary rock)
Sedimentary
Pink Granite
Granite (Felsic Plutonic Rock)
igneous
Red Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Flint) with Quartz Inclusions
Microcrystalline Quartz (SiO2)
sedimentary