Herkimer Diamond (Quartz)
Silicon Dioxide (SiO2)
Category
Browse mineral, part of a rock specimens identified by the Rock Identifier community.
Herkimer Diamond (Quartz)
Silicon Dioxide (SiO2)
Pink Granite
Granite (Alkali-feldspar granite)
Thunderegg
Agate-filled Rhyolitic Nodule (SiO2)
Quartz (Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Granite Pegmatite
Phaneritic Plutonic Igneous Rock
Pyrite in Shale
Iron Sulfide (FeS2) in Sedimentary Matrix
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Quartz / Common Opal
Silicon Dioxide (SiO2)
Copper-bearing Quartz (likely Chrysocolla or Malachite staining)
Cuprite, Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) or Malachite staining on Quartz/Host Rock
Chalcedony
Cryptocrystalline Quartz (SiO2)
White Quartz (Tumbled)
Silicon Dioxide (SiO2)
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
Anthracite Coal
Anthracite (a variety of coal, predominantly carbon)
Larimar
Pectolite [NaCa2Si3O8(OH)] with copper substitution
Quartz Geode in Sedimentary Matrix
Silicon Dioxide (SiO2) within a limestone/dolostone host
Marble
Recrystallized Calcite (CaCO3) Rock
Carnelian
Carnelian (SiO2)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Jasper
Silicon Dioxide (SiO2) with impurities
Yellow Quartz (Chalcedony)
Quartz / Chalcedony (Silicon Dioxide, SiO2)
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
Granite
Granite (a felsic intrusive igneous rock)
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
Granite
Granite
Basalt with Quartz Veining
Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)
Nephrite Jade
Nephrite
Druzy Agate (specifically Black Druzy Agate)
Silicon Dioxide (SiO2)
Basalt with Quartz/Calcite Inclusions
Mafic Volcanic Rock (Fe-Mg silicate rich)
Basalt with Epidote Veins
Mafic Igneous Rock (Basalt)
Sandstone (Red Sandstone / River Stone)
Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)
Turquoise
Hydrous phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Hematite/Limonite oxides)
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Quartz Geode (partially formed/chalcedony with iron staining)
Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides
Gneiss
Gneiss
Granite
Plutonic felsic igneous rock
Petrified Wood
Silicified Wood (SiO2)
Granodiorite Pebble
Granodiorite
Emerald with Matrix (Emerald in Mica Schist)
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)