Scoria (Lava Rock)
Scoria
Category
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
Scoria (Lava Rock)
Scoria
Slag
Metallurgical by-product
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
Blue Lace Agate
Silicon Dioxide (SiO2) with Chalcedony structure
Basalt
Basalt
Serpentinite
Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Basalt
Basalt (Mafic volcanic rock)
Granite Pebble
Granitoid (Quartz-Feldspar dominant rock)
Granite (Pink/Potassium-rich)
Phaneritic Plutonic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)
Marble
Recrystallized Calcite (CaCO3)
Calcite
Calcite (CaCO₃)
Quartz Pebble
Silicon Dioxide (SiO2)
Malachite
Copper carbonate hydroxide, Cu2CO3(OH)2
Chrysocolla and Azurite on Matrix
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla) and Copper carbonate hydroxide Cu3(CO3)2(OH)2 (Azurite)
Ferruginous Quartz (Iron-Stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Peridotite
Ultramafic intrusive rock (Peridotite)
Milky Quartz
Silicon Dioxide (SiO2)
Lapis Lazuli
Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite and other associated minerals)
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Botryoidal Malachite
Malachite - Cu2CO3(OH)2
Quartz (Milky/Macro-crystalline)
Silicon Dioxide (SiO2)
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
Zircon
Zirconium Silicate (ZrSiO₄)
Cubic Zirconia (in Jewelry)
Zirconium Dioxide (ZrO2)
Milky Quartz
Silicon Dioxide (SiO2)
Milky Quartz Cobble
Quartz (Silicon Dioxide, SiO2)
Obsidian
Volcanic Glass (Primary component: SiO2)
Green Aventurine
Aventurine Quartz (SiO2)
Citrine
Silicon Dioxide (SiO2) - Macrocrystalline Quartz variety
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
Diamond (or Clear Zircon/Sapphire)
Carbon (C)
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
Diamond (Baguette cut)
Carbon (C)
Earthy Hematite / Goethite Surface
Iron Oxide (Fe2O3 – α-FeO(OH))
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
Diamond
Carbon (C)
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
Diamond (in jewelry)
Element Carbon (C)
Amethyst (Quartz Cluster)
Silicon Dioxide (SiO2) with iron impurities
Olivine Peridotite
Peridotite (comprising Olivine (Mg,Fe)2SiO4 and Pyroxene)