Granite
Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)
igneous
Category
Igneous, Sedimentary, Or Metamorphic (Mineral Based)
Browse igneous, sedimentary, or metamorphic (mineral based) specimens identified by the Rock Identifier community.
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Granite
Phaneritic Plutonic Rock (High Silica content)
igneous
Nephrite Jade
Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Sandstone
Arenite (predominantly SiO2 quartz grains)
sedimentary
Basalt
Basalt
igneous
Basalt (River Cobble)
Mafic Igneous Basalt (composed primarily of Plagioclase feldspar, Pyroxene, and Olivine)
Igneous
Garnet (Almandine)
Almandine, Fe3Al2(SiO4)3
metamorphic
Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 with inclusions)
sedimentary
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Pink Quartz (Rose Quartz variant)
Silicon Dioxide (SiO2)
mineral
Yellow Chalcedony
Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Vesicular Basalt with Oxidation
Scoriaceous Olivine Basalt (Mafic volcanic rock)
igneous
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
sedimentary
Pink Granite
Granite (Phaneritic intrusive rock rich in K-feldspar)
igneous
Labradorite
(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Galena
Lead Sulfide (PbS)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide - SiO2)
Mineral
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Slag (Industrial Byproduct)
Artificial silicate/iron byproduct
Mineral description (Anthropogenic material)
Glauconite (Green Sandstone)
Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Mixed collection of minerals and rocks (Jasper, Carnelian, Granite, and Quartz)
Silicon Dioxide (SiO2) with varying impurities for silicates and igneous aggregates
igneous, sedimentary, and metamorphic
Gold flakes
Native Gold (Au)
mineral
Basalt (Crushed Roadstone)
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Greenstone
Greenschist / Greenstone (Chlorite-Epidote facies)
metamorphic
Vesicular Basalt
Basalt with secondary mineral infilling (Amygdaloidal Basalt)
igneous
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Granite (specifically Pink Granite)
Phaneritic Plutonic Rock (High Potassium Feldspar Granite)
igneous
Mica in Quartz Host
Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz (SiO2)
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Quartz (on matrix)
Quartz (Silicon Dioxide, SiO₂)
Mineral
Carved Mottled Greenish-Yellow Crystal/Glass Object
Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.
Man-made Object/Uncertain Mineral
Sandstone (Micaceous)
Clastic Sedimentary Rock (primarily SiO2 with Mica)
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2) with Iron Oxide impurities
mineral
Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary