Quartz (Crystal/Druzy Quartz)
Quartz (SiO₂)
Mineral
Category
Metamorphic Rock
Browse metamorphic rock specimens identified by the Rock Identifier community.
Quartz
Quartz (SiO₂)
Mineral
Sandstone (Weathered Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Druzy Quartz on Chert/Siltstone
Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix
sedimentary
Laterite
Laterite (no specific mineral formula as it's a rock type)
Sedimentary
Quartz
Silicon Dioxide (SiO2)
Mineral
Rhodonite
Manganese Silicate (Mn, Fe, Mg, Ca)SiO3
mineral
Granite
Plutonic felsic rock (Quartz, Feldspar, Mica)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Sapphirine in Magnesian Schist
Sapphirine: (Mg,Al)8(Al,Si)6O20
metamorphic
Herkimer Diamond
Quartz (Silica - SiO2)
mineral
Garnet (likely Almandine or Pyrope)
Garnet Group (e.g., Almandine: Fe3Al2(SiO4)3; Pyrope: Mg3Al2(SiO4)3)
Mineral
Basalt
Basalt (composition predominately Plagioclase feldspar and Pyroxene)
igneous
Quartz (Milky Quartz)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Vesicular Basalt with Quartz/Chalcedony
Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)
igneous
Ruby Fuchsite / Ruby in Fuchsite
Ruby (Al2O3 variety corundum) and Fuchsite (K(Al,Cr)2AlSi3O10(OH)2 - a chromium-rich variety of muscovite mica) in Quartz matrix
Mineral
Basalt
Basalt (Mafic Extrusive)
igneous
Fuchsite
Chromium-rich Muscovite (KAl2(AlSi3O10)(OH,F)2 with Cr replacements)
mineral
River Rocks (Black)
Various lithologies (e.g., basalt, chert, obsidian for black varieties), mechanically rounded clasts
Sedimentary
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Pegmatite (likely Granitic Pegmatite)
Pegmatite (a coarse-grained igneous rock, often with granitic composition)
igneous
Ruby (Corundum)
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Quartz (likely macrocrystalline variety)
Quartz (SiO₂)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Drill Core Sample
Cylindrical Rock Core (Specific mineralogy varies by extraction site)
Metamorphic (Likely Gneiss or Schist based on texture)
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Jadeite Jade
Jadeite (NaAlSi2O6)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Shale
Lutaceous sedimentary rock
sedimentary
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Basalt
Vesicular Basalt
igneous
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
sedimentary
Quartz Vein Rock
Quartz (Silicon Dioxide, SiO2)
igneous
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Pink Granite
Phaneritic Plutonic Igneous Rock (high K-feldspar)
igneous
Red Sandstone
Sandstone (principally Quartz with Iron Oxide coating)
sedimentary
Basalt with Vesicles
Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Rhodonite
Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3
mineral