Obsidian
Obsidian (Volcanic Glass)
igneous
Category
Mineral Like Byproduct
Browse mineral like byproduct specimens identified by the Rock Identifier community.
Quartz
Silicon Dioxide (SiO₂)
Mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Blue Cracked Quartz (Dyed Fire Crackle Quartz)
Silicon Dioxide (SiO2) with synthetic dye
mineral
Caribbean Calcite
Calcium Carbonate with Argonite (CaCO3)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Nuummite
Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)
metamorphic
Labradorite
Labradorite (a calcium-enriched sodic plagioclase feldspar mineral - (Ca, Na)(Al, Si)4O8)
mineral
Granite (Weathered)
Granite (Felsic Plutonic Rock)
igneous
Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Orthoceratid Fossil in Limestone
Orthoceras (extinct genus of Nautiloid Cephalopod)
sedimentary
Sandstone (Ferruginous)
Arenite (with high iron oxide content)
sedimentary
Schist
Mica Schist
metamorphic
Amethyst (Agate/Chalcedony variety)
Silicon Dioxide (SiO2) with iron impurities
mineral
Chert (Flint variety)
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Sandstone with Foliose Lichen
Arenite (Rock matrix) with Xanthoparmelia or Flavoparmelia (Lichen genus)
sedimentary
Blue Lace Agate (Banded Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Sandstone (River Rock)
Arenite (composed primarily of SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Hematite/Goethite)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Chert (Jasper/Limonitic Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Snowflake Obsidian
Vitreous Volcanic Rock (Amorphous Silicate), SiO2
igneous
Calcite
Calcite (CaCO 3)
Mineral
Stilbite
Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)
mineral
Agate (specifically Carnelian or Honey Agate)
Silicon Dioxide (SiO2)
Mineral
Amber
Succinite (specifically Baltic Amber) - Formula: C10H16O (approximate)
Organic Mineraloid
Fluorite Tower
Calcium Fluoride (CaF2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Howlite (Tumbled)
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Azurite
Azurite (Cu3(CO3)2(OH)2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Howlite
Howlite (Ca2B5SiO9(OH)5)
mineral
Fancy Jasper
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral