Chevron Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Category
Not A Geological Specimen
Browse not a geological specimen specimens identified by the Rock Identifier community.
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Granite (Specimen: Logan Rock)
Phaneritic plutonic igneous rock (mainly Quartz, Feldspar, and Mica)
igneous
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Fluorite Octahedron
Fluorite (Calcium Fluoride, CaF2)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Rough Sapphire
Corundum (Al2O3)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Jadeite
Jadeite (NaAlSi2O6)
metamorphic
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Jasper
Jasper (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Azurite Geode
Azurite (Cu3(CO3)2(OH)2)
mineral
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Ferruginous Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Azurite and Malachite on Matrix
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)
sedimentary
Ambergris (Geological/Organic Specimen)
Ambra grisea (Produced by Physeter macrocephalus)
organic material
Pyrite
Iron Disulfide (FeS2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Quartzite (River Stone)
SiO2 (Silicon Dioxide)
metamorphic
Jasper with Quartz inclusions
Silicon Dioxide (SiO2) with impurities
sedimentary
Tiger Iron
Tiger Iron (Hematite, Red Jasper, and Chert/Tiger's Eye composite)
metamorphic
Cloudy Quartz / Quartz Tumble
Silicon Dioxide (SiO2)
mineral
Aventurine
Aventurine Quartz (SiO2 with inclusions)
Mineral
Massive Quartz with Host Rock
Silicon Dioxide (SiO2)
mineral
Andesite Porphyry (River Cobble)
Porphyritic Andesite
igneous
Amethyst/Smoky Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Garnet Schist or Garnet-bearing Quartzite
Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)
metamorphic
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Fieldstone/Pebble)
Silicon Dioxide (SiO2)
mineral
Amazonite
Amazonite (KAlSi3O8, a variety of Microcline)
mineral
Schist (Garnet-Mica Schist)
Garnetiferous Mica Schist (primarily Muscovite/Biotite and Almandine Garnet)
metamorphic
Pyrite with Limonite/Goethite Alteration (Pseudomorph)
Iron Sulfide (FeS2) transitioning to Hydrated Iron Oxides (FeO(OH)·nH2O)
mineral