Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Category
Mineral Description (Anthropogenic Material)
Browse mineral description (anthropogenic material) specimens identified by the Rock Identifier community.
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Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Obsidian
Volcanic Glass (SiO2)
igneous
Slate
Slate (foliated metamorphic rock)
metamorphic
Greenstone
Metabasalt / Greenschist facies rock
metamorphic
Plum Blossom Tourmaline
Tourmaline with Lepidolite (Na,Ca)(Li,Mg,Al)3Al6(BO3)3Si6O18(OH)4
igneous
Nuummite
Nuummite (intergrowth of orthoamphiboles Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)
metamorphic
Sandstone with Vitrinite/Coal inclusions
Arenite with Carbonaceous inclusions
sedimentary
Fossilized Bone / Dinosaur Fossil
Fossilized vertebrate bone (permineralized)
fossil
Fossilized Bivalve Shell
Bivalvia (Phylum Mollusca)
fossil
Sandstone Flagstone
Arenite (SiO2 with various cementing agents)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz pebble in concrete
Quartz (SiO₂), embedded in Portland-cement concrete
mineral
Blue Topaz
Al2SiO4(F,OH)2
mineral
White Howlite
Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Smoky Quartz with Feldspar
Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Peridotite (Olivine Rock)
Peridotite (composed largely of olivine, (Mg, Fe)2SiO4)
igneous
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Sandstone with Iron Oxide Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone (Quartz-rich)
Arenite (composed mainly of SiO2)
sedimentary
Polymer Clay (Mock Mineral)
Polyvinyl chloride (PVC) with plasticizers and pigment
Synthetic material (Not a natural rock/mineral)
White seed-bead gemstone strand, likely freshwater pearl or shell pearl
Pearl: nacreous calcium carbonate, chiefly aragonite (CaCO₃) in conchiolin; identification uncertain from image
gemstone
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Granitic Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Tumbled dark green stone, likely serpentine or greenstone
Serpentinite (hydrated magnesium silicate minerals, chiefly antigorite/lizardite); possible chlorite-rich greenstone
metamorphic
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Gneiss
Gneissic Metamorphic Rock
metamorphic
Red Sandstone
Ferruginous Sandstone
sedimentary
Weathered iron-rich rock, possibly laterite or limonite-bearing stone
Hydrated iron oxides/hydroxides, chiefly limonite-goethite mixture; exact identification requires testing
mineral
Dendritic Agate (Tree Agate)
Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions
mineral
Tree Agate (or Moss Agate)
Dendritic Agate (Silicon Dioxide - SiO2)
mineral
Tumbled brecciated jasper
Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions
mineral
Polished green aventurine (likely)
Quartzite dominated by quartz (SiO₂), commonly containing fuchsite mica
mineral