Yooperlite (Syenite clasts with Sodalite)
Fluorescent Sodalite-bearing Syenite
igneous
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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River Rock
Sedimentary Rock (various compositions)
sedimentary
Jasper (Iron-rich)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities
sedimentary
Fossil Shark Tooth
Otodus sp. (Eocene shark fossil)
fossil
Schist
Mica Schist
metamorphic
Mica Schist
Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Chert (with Fossiliferous Silicification)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Golden Mica Schist
Mica Schist (primarily Muscovite/Biotite with Quartz)
metamorphic
Favosites Fossil (Honeycomb Coral)
Favosites (Order Favositida)
sedimentary
Serpentine
Serpentinite (complex of Mg, Fe, Ni, Al, Zn, Mn)Si2O5(OH)4
metamorphic
Mica Schist with Garnet
Garnetiferous Mica Schist
metamorphic
Coquina
Bioclastic Limestone (CaCO3)
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Black Opal
Hydrated silica (SiO2·nH2O)
mineraloid
Coquina or Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Seraphinite
Clinochlore (Mg,Fe)5Al(AlSi3O10)(OH)8 - specific variety for Seraphinite due to its fibrous inclusions and chatoyancy.
Mineral
Corundum
Corundum (Al2O3)
Mineral
Porfido (Porphyritic Rock)
Porphyry (often Rhyolitic or Andesitic)
igneous
Quartzite (River Pebble)
Quartzite (SiO2)
metamorphic
Caliche (also known as hardpan, calcrete, kankar)
Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.
Mineral
Conglomerate
Conglomerate (SiO2 matrix with varying clasts)
sedimentary
Basalt
Basalt
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Basalt (Road Gravel)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Limestone
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Basalt River Pebble
Extrusive mafic volcanic rock
igneous
Granodiorite Pebble
Granodiorite
igneous
Basalt
Basalt (Igneous Volcanic Rock)
igneous
Vesicular Basalt
Extrusive mafic igneous rock
igneous
Vesicular Basalt with Oxidized Crust
Vesicular Basalt (Iron-rich extrusive volcanic rock)
igneous
Granite Pebble
Granite (composed primarily of Quartz: SiO2, Feldspar: KAlSi3O8, and Mica: K(Mg,Fe)3AlSi3O10(OH)2)
igneous
Granite
Phaneritic plutonic rock (SiO2 > 69%)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Vesicular Basalt or Scoria
Basalt (extrusive volcanic rock)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Porphyritic Basalt (or Porphyry)
Porphyritic Andesite/Basalt (primarily Plagioclase feldspar and Pyroxene)
igneous
Red Granite
Felsic Intrusive Igneous Rock
igneous
Siltstone
Siltstone (primarily composed of microcrystalline Quartz and Feldspar)
sedimentary
Basalt
Extrusive mafic igneous rock
igneous
Basalt
Mafic Igneous Rock (Basalt)
igneous
Ferruginous Sandstone (Ironstone Conglomerate fragments)
Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous