Shale
Shale (clay-sized silicate minerals)
sedimentary
Category
Mineral
Browse mineral specimens identified by the Rock Identifier community.
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Fossilized Shark Tooth
Fossilised Chondrichthyes dental specimen (likely Otodus or Carcharias sp.)
mineral
Porphyritic Basalt (with Olivine or Quartz phenocryst)
Porphyritic Basalt (Mafic Extrusive)
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Quartz with Mica inclusions (likely Schist or Gneiss host)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
metamorphic
Quartz with Schist Inclusion
Crystalline Silicon Dioxide (SiO2) with Muscovite/Biotite Schist
metamorphic
Note: Item is not a geological specimen
Polyester mesh and Ethylene-vinyl acetate (EVA) polymer
Synthetic / Anthropogenic Material
Dyed Quartz (imitating Emerald/Green Quartz)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Porphyritic Basalt
Porphyritic Basalt (with Plagioclase and Augite phenocrysts)
igneous
Garden Quartz (Lodolite)
Quartz with inclusions (SiO2 + various inclusions such as Chlorite, Hematite, or Feldspar)
mineral
Pink Granite
Granite (Felsic Plutonic Rock)
igneous
Red Jasper with Quartz Veining
Jasper (Silicon Dioxide, SiO2) with Quartz (SiO2) inclusions
sedimentary
Green Aventurine
Aventurine Quartz (SiO2 containing Fuchsite)
metamorphic
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Bort or Carbonado
C - Polycrystalline Diamond
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-feldspar, Quartz, and Biotite)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Green Aventurine
Silicon dioxide with Fuscite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Greenstone
Greenschist
metamorphic
Porphyritic Rhyolite
Porphyritic Rhyolite (SiO2)
igneous
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Gneiss
High-grade regional metamorphic rock
metamorphic
Schist
Mica Schist
metamorphic
Moonstone
Orthoclase (KAlSi3O8) with inclusions of Albite (NaAlSi3O8)
mineral
Basalt with Quartz Vein
Basalt (extrusive igneous rock) with Quartz (SiO2) inclusion
igneous
Granite or Granitic Gneiss
Granitoid / Gneiss
Igneous / Metamorphic
Gold (Elemental Metal)
Gold (Au)
Mineral
Schist
Mica Schist
metamorphic
Diorite
Phaneritic intermediate plutonic rock (Diorite)
igneous
Shale
Fissile Mudrock (Clay-rich Sedimentary Rock)
sedimentary
Bismuth
Bismuth (Bi)
Mineral
Marble
Metamorphosed Limestone (main mineral: Calcite, CaCO3)
metamorphic
Quartz on Feldspar
Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)
igneous
Tiger's Eye
Tiger's Eye (SiO2 with crocidolite inclusions)
mineral
Geode (unopened)
SiO2 - Chert-shelled concretion (mostly Quartz)
sedimentary
Chrysocolla on Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Goethite
Goethite (FeO(OH))
mineral
Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
mineral
Amazonite
K(AlSi3O8) - Potassium Aluminum Silicate (variety of Microcline)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary