Crushed Granite Gravel
Granite (Mainly Quartz, Feldspar, and Mica)
igneous
Category
Mineral (Specifically A Mineraloid)
Browse mineral (specifically a mineraloid) specimens identified by the Rock Identifier community.
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Porphyry (specifically Porphyritic Andesite / Rhyolite)
Porphyritic Igneous Rock
igneous
Pink Amethyst (or Pink Quartz)
Silicon Dioxide (SiO2) with trace inclusions
gemstone
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Fossiliferous Limestone (Crinoidal Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (specifically Jaspery Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite (or Massive Quartz)
Silicon Dioxide (SiO2)
metamorphic
Slag Glass
Glassy Silicate Residue
industrial byproduct
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions (Quartzite)
metamorphic
Mahogany Obsidian
Obsidian (volcanic glass with Hematite/Magnetite inclusions)
igneous
Calligraphy Stone
Fossiliferous Stromatolite Limestone (also known as Arabic Script Stone, Miriam Stone, or Elephant Skin Jasper)
sedimentary
Leopard Skin Jasper
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Jasper
Silicon Dioxide (SiO2) - Impure Variety of Chert
sedimentary
Gabbro
Gabbro (mafic intrusive igneous rock)
igneous
Jasper (specifically Bloodstone/Heliotrope or Dark Green Jasper)
Cryptocrystalline Quartz (SiO2) with inclusions
sedimentary
Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
Igneous
Apache Tear (Obsidian)
Obsidian
Igneous
Basalt (Drill Core)
Mafic Volcanic Rock (Basalt)
igneous
Basalt
Basalt (Composition primarily Plagioclase feldspar, Pyroxene, and Olivine)
igneous
Serpentine (Serpentinite)
Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Sandstone
Arenite (primarily SiO2 with iron oxide cementation)
sedimentary
Red Jasper
Jasper (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Amber
Succinicum (Organic compound, primarily C10H16O)
Organic Gemstone (Mineraloid)
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)
Mineraloid (Organic Gemstone)
Quartzite
Metamorphic Quartz-rich Rock
metamorphic
Jasper
Silicon dioxide (SiO2)
sedimentary
Biggs Jasper
Cryptocrystalline Quartz (Silicon Dioxide) - SiO2
sedimentary
Mookaite (Mookaite Jasper)
Silicified Radiolarite (SiO2 with iron oxides)
sedimentary
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Banded Flint (Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Black River Stone (Chert or Basalt Pebble)
Microcrystalline Quartz (SiO2) or Mafic Igneous Rock
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Black Jasper
Silicon Dioxide (SiO2) with inclusions
sedimentary
Pink Granite
Granite (Felsic Plutonic Rock)
igneous
Fossiliferous Limestone
CaCO3 (principally Calcite or Aragonite)
sedimentary
Basalt Porphyry
Porphyritic Basalt
igneous
Mookaite Jasper
Radiolarite (Silica, SiO2)
sedimentary
Yellow Jasper (Chert variant)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Yellow Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Pink Granite
Phaneritic Plutonic Felsic Rock (Granite)
igneous