Granite
Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)
igneous
Category
Mineral Like Byproduct (Technogenic)
Browse mineral like byproduct (technogenic) specimens identified by the Rock Identifier community.
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Dendritic Agate
Silicon Dioxide with Manganese or Iron Oxide inclusions (SiO2)
sedimentary
Schist
Metamorphic Rock (Mica Schist)
metamorphic
Limonite with Ironstone
Limonite (hydrated iron(III) oxide-hydroxides), FeO(OH)·nH2O
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Garden Quartz (Lodolite / Inclusion Quartz)
Quartz with inclusions (SiO2 with various mineral inclusions)
gemstone
Quartz with Chlorite inclusions
Silicon Dioxide (SiO2) with Chlorite group minerals (hydrous magnesium iron alumino-silicate)
mineral
Snowflake Obsidian
Volcanic Glass (SiO2 rich with Cristobalite inclusions)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in sedimentary matrix
sedimentary
Greenstone / Metabasalt
Metamorphosed Mafic Rock (Greenschist facies)
metamorphic
Lepidolite on Pegmatite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Potassium Feldspar (Orthoclase / Microcline)
KAlSi3O8
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone (Ferruginous)
Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)
sedimentary
Quartz-Veined Sandstone
Quartz-veined Arenite
sedimentary
Limonite Nodules / Goethite
Hydrated Iron Oxide-Hydroxide (FeO(OH)·nH2O / Fe2O3·nH2O)
mineral
Fossil Shark Tooth
Lamniformes (order) - likely Cretalamna or Carcharias species
fossil
Quartz with Mica inclusions (likely Iron-stained)
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Mica (Muscovite)
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Chrysocolla
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Chert (Flint / Jasper / Hornstone)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Granite
Igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Greenstone
Chlorite schist or Epidosite
metamorphic
Obsidian
Volcanic Glass (SiO2)
igneous
Fossilized Shark Tooth
Lamniformes (order) fossil
fossil
Dalmation Stone (Dyed)
Peralkaline rhyolite
igneous
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Diorite
Diorite (Intrusive igneous rock)
igneous
Lepidolite on Matrix
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
mineral
Tree Agate
Silicon Dioxide (SiO2) with Dendritic Inclusions
Mineral
Blue Quartz
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone
Ferruginous Sandstone (Quartz Arenite with Iron Oxide cement)
sedimentary
Megalodon Shark Tooth Fossil
Otodus megalodon (fossilized in sedimentary matrix)
sedimentary
Golden Healer Quartz
Silicon Dioxide (SiO2) with limonite/hematite inclusions
mineral
Quartz (Smoky/Granular variety)
Silicon Dioxide (SiO2)
mineral
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Epidosite (Epidote-Quartz rock)
Epidote-rich hydrothermal rock
metamorphic
Geode (unopened) or Calcareous Nodule
Siliceous or Calcareous Concretion/Nodule
sedimentary