Black Obsidian
Volcanic Glass (SiO2)
igneous
Category
Mineral Like Byproduct (Technogenic)
Browse mineral like byproduct (technogenic) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
sedimentary
Limonite Concretion
Limonite (Hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
sedimentary
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite (SiO2 + Fe2O3)
igneous
Quartz on Schist
Silicon Dioxide (SiO2) on Foliated Metamorphic Rock
metamorphic
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Glaucophane Schist (Blueschist)
Blueschist (Glaucophane-bearing schist)
metamorphic
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Shark Tooth
Fossilized elasmobranch tooth (Apatite/Calcium Phosphate)
sedimentary
Diorite (or Gabbro/Granitoid)
Diorite
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Blue Quartzite (Dyed)
Metamorphosed Quartz-rich Sandstone (SiO2 with organic dye)
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile; (Mg, Fe)3Si2O5(OH)4
metamorphic
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)
fossil
Granite
Granite
igneous
Granite
Granite (composed primarily of Quartz SiO2, Orthoclase KAlSi3O8, and Plagioclase NaAlSi3O8 to CaAl2Si2O8)
Igneous
Desert Rose
Gypsum rosette (CaSO4·2H2O) or Barite rosette (BaSO4)
mineral
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite or Magnetite inclusions)
igneous
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)
mineral
Green Schist
Greenschist (containing Chlorite, Actinolite, and Epidote)
metamorphic
Schist
Mica Schist
metamorphic
Green Aventurine
Silicon Dioxide (Quartz variety with Fuchsite inclusions - SiO2)
mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with iron oxide inclusions/staining (Limonite/Hematite)
Mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (composed primarily of Fluorapatite)
mineral
Celadonite in Amygdaloidal Basalt
K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2 (Celadonite mineral) within a Basalt matrix
igneous
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Leopard Skin Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Liesegang Banded Sandstone (Wonderstone)
Ferruginous Sandstone with Liesegang Rings
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende, chlorite, or manganese/iron oxides
mineral
Amygdaloidal Basalt with Quartz Infill
Amygdaloidal Basalt (SiO2 infill)
igneous
Limonite Concretion
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Gneiss (specifically a Granitic Gneiss)
Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
River Stones (Quartzite and Sandstone)
Quartzite / Sedimentary Rock (SiO2 dominant)
sedimentary
Agate
Silicon Dioxide / Cryptocrystalline Quartz (SiO2)
mineral
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
mineral
Diorite
Diorite
igneous
Chrysocolla on Limonite Matrix
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) on FeO(OH)·nH2O (Limonite)
mineral