Slag (Industrial Glass Slag)
Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)
Mineraloid (Industrial byproduct)
Category
Organic Mineraloid And Mineral
Browse organic mineraloid and mineral specimens identified by the Rock Identifier community.
Moss Agate
Chalcedony (Silicon Dioxide with inclusions) - SiO2
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
Mineral (Variety of Chalcedony)
Septarian Nodule
Septarian Concretion
sedimentary
Picture Jasper
SiO2
mineral
Black Jasper (Etched)
Silicon Dioxide (SiO2) with impurities
mineral
Chalcedony (Agatized Coral / Rough Chalcedony Node)
Silicon Dioxide (SiO2)
mineral
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)
Chalcedony (SiO₂)
Mineral (or mineraloid if microcrystalline)
Chert (specifically Flint or Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Zebra Marble
Metamorphosed Alabaster/Limestone (CaCO3)
metamorphic
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Pink Opal
Hydrated silica (SiO2 "n H2O)
mineral
Green Moss Agate
Agate (Silicon Dioxide - SiO2 with inclusions of Manganese/Iron oxides)
mineral
Yellow Jasper
Silicon Dioxide with Limonite/Goethite inclusions (SiO2)
sedimentary
Kambaba Jasper
Stromatolite Jasper (Microcrystalline Quartz)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Basalt with Amygdaloidal Inclusions
Aphanitic Mafic Volcanic Rock (Basalt)
igneous
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Jasper (likely Ocean Jasper or Variegated Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
K2 Jasper (K2 Granite)
Azurite in Granite (K(Mg,Fe)3AlSi3O10(OH,F)2 + Cu3(CO3)2(OH)2)
igneous
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)
mineral
Moonstone
Orthoclase (Potassium aluminum silicate - KAlSi3O8)
mineral
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Sandstone
Arenite (SiO2 principal)
sedimentary
Garden Quartz
Included Quartz (SiO2 with accessory minerals such as Chlorite, Hematite, or Feldspar)
mineral
Orca Agate (Blue Chalcedony)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcedony replacement)
Mineral / Fossil
Sandstone
Arenite (primarily composed of SiO2)
sedimentary
Agatized Fossil (Druzy Agate)
Silicon Dioxide (SiO2) replacing organic matter
sedimentary
Slag Glass
Amorphous Silica Glass (with metal oxide inclusions)
Mineraloid / Industrial Waste
Fossil Coral (Rugosa or Solitary Coral)
Rugosa (Order), often referred to as 'Horn Coral' (Lithostrotionella or Grewingkia)
sedimentary
Chert (Holey Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Precious Red Coral
Corallium rubrum / Corallium japonicum
mineral (organic gemstone)
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Amber
Succinite (fossilized resin, C10H16O)
mineral
Sulfidic Mudstone with Pyrite/Goethite
Sulfidic Siltstone/Mudstone (FeS2)
sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Paleoxylon (primarily SiO2)
sedimentary