Chalcedony (Grey/White Agate)
Silicon Dioxide (SiO₂)
mineral
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Pink Opal
Amorphous Hydrous Silica (SiO2·nH2O)
mineral
Pyrite (Iron Pyrite)
Iron Disulfide (FeS2)
mineral
Chalcedony (Agate/Carnelian)
Cryptocrystalline Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Blue Chalcedony
Chalcedony (SiO2)
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Rough Diamond
Diamond (C)
mineral
Rough Diamond
Diamond (Pure Carbon: C)
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Lignite (Brown Coal)
Lignite (C189H155O6N3S)
sedimentary
Anthracite Coal
Anthracite (Carbon C)
metamorphic
Quartzite with Iron Mineral Banding
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining
metamorphic
Black Obsidian and Hematite
Volcanic Glass (SiO2) and Hematite (Fe2O3)
igneous and mineral
Green Aventurine
Aventurine (Silicon dioxide, SiO₂)
Mineral; variety of Quartz
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
metamorphic
Gold Ore
Native Gold (Au)
mineral
Jade (likely Jadeite)
Jadeite (a pyroxene mineral) or Nephrite (a variety of amphibole mineral)
Mineral
Green Quartzite (Aventurine-like)
Quartzite (primarily SiO2 with chromium-rich mica or chlorite inclusions)
metamorphic
Ocean Jasper
Orbicular Jasper/Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Shale (or Mudstone)
Siltstone/Argillite (composed mainly of clay and silt-sized particles)
sedimentary
Quartz (Milky or Cloudy variety)
Silicon Dioxide (SiO2)
mineral
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Botryoidal Chalcedony (Agate/Desert Rose Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Anthracite Coal
Anthracite
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Ruby in Zoisite
Ruby (α-Al2O3) embedded in Zoisite (Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (composed of multiple minerals)
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2(SiO3)6) with chromium/vanadium traces
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Siltstone
Siltstone (primarily SiO2, Al2O3)
sedimentary
Rough Star Sapphire (Corundum)
Al2O3 (Aluminum Oxide)
mineral
Nuummite
Antophyllite-Gedrite (Orthorhombic amphiboles)
metamorphic
Mudstone
Lutylite (group of fine-grained sedimentary rocks)
sedimentary
Stichtite in Serpentine (Atlantisite)
Mg6Cr2CO3(OH)16·4H2O (Stichtite) / Mg3Si2O5(OH)4 (Serpentine)
metamorphic
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Jade (likely Nephrite or Jadeite)
Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
Metamorphic rock (for Nephrite and some Jadeite); Mineral (for Jadeite)
Emerald in Matrix (Quartz/Schist)
Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities
mineral
Aragonite Star Cluster
Aragonite (Sputnik habit) - CaesarCO3
mineral