Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Category
Mineraloid Like Synthetic Material
Browse mineraloid like synthetic material specimens identified by the Rock Identifier community.
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Sandstone (Pebble / Cobble)
Arenite / Sedimentary Rock (composed of quartz and feldspar)
sedimentary
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Chert (often called Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)
sedimentary
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz (with potential inclusion)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Microcline Feldspar
KAlSi3O8
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (often called Flint when found in chalk)
Microcrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Fossil Shark Tooth (Sand Tiger Shark type)
Carcharias sp. (likely Odontaspis)
fossil
Flint / Chert
Silicon dioxide (SiO2)
sedimentary
Chert (or Flint)
Chert (SiO2)
sedimentary
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of Cellulose)
fossil
Obsidian Arrowhead
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Potassium-Rich Silicate Clay (inferred from biological context)
Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)
mineral
Sandstone (likely Quartzose Sandstone pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (with Moss)
Quartz Arenite / Sandstone
sedimentary
Chert (Flint variety)
Silicon dioxide (SiO2)
sedimentary
Chert (Flint Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Sandstone (with manganese staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granitic Gneiss
Gneiss (high-grade metamorphic rock)
metamorphic
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (Iron Ore)
Limonite (mixture of hydrated iron(III) oxide-hydroxides)
Mineral
Chert (and Fossilized Brachiopod shell)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Limonite (Iron Ore)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Beads (likely glass or man-made material)
N/A (artificial material)
Man-made material, not a natural rock or mineral specimen