Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Category
Mineraloid (Man Made Origin)
Browse mineraloid (man made origin) specimens identified by the Rock Identifier community.
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Aragonite Star Cluster
Aragonite (CaCO3)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Shale
Fissile mudstone (Shale)
sedimentary
Popcorn
Zea mays everta (P. Wilson) (Botanical name for the corn variety)
Organic/Biogenic
Quartzite (Iron-stained)
Quartzite (SiO2 with iron oxides)
metamorphic
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Granite
Phaneritic Granitoid
igneous
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Green Quartzite
Quartzite (SiO2)
metamorphic
Basalt with Garnet inclusions
Basalt containing Nesosilicate (Garnet Group, likely Almandine Fe3Al2Si3O12)
igneous
Basalt with Desert Varnish
Mafic Volcanic Rock (Fe/Mg rich Silicate)
igneous
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Granite
Granite (a common term for a felsic intrusive igneous rock)
igneous
Gastropod Steinkern (Fossil Snail Internal Mold)
Class Gastropoda (Internal Mold)
sedimentary
Scoria
Highly vesicular mafic volcanic rock
igneous
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO₂)
metamorphic
Tiger's Eye
Pseudomorph of quartz after crocidolite (SiO2)
metamorphic
Lava Rock (Scoria)
Scoria (Vesicular Basalt)
igneous
Petrified Wood (Agatized/Silicified Wood)
Silicified Paleoxylon (primarily SiO2)
sedimentary
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Orange Quartzite
Quartzite (primarily SiO2 with Hematite impurities)
metamorphic
Quartzite with inclusions
Quartzite
metamorphic
Quartzite with Sandstone/Siltstone matrix
Metamorphosed Arenite (SiO2)
metamorphic
Limonite Pseudomorph after Pyrite
Limonite (Hydrous iron oxides e.g., FeO(OH)·nH2O) pseudomorphing Pyrite (FeS2)
mineral
Oolitic Chert
Ooidal Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)
mineral
Quartzite Pebble (with Iron Staining)
Quartzite (SiO2)
metamorphic
Red Quartzite / Ferruginous Quartzite
Quartzite (primarily SiO2 with Fe2O3 inclusions)
metamorphic
Quartz / Quartzite
Quartz (Silicon Dioxide, SiO2)
metamorphic
Yellow Quartzite
Quartzite (primarily SiO2)
metamorphic
Fossilized Echinoid (Sea Urchin)
Echinoidea (Fossil)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxides)
metamorphic
Orange Quartzite (Tumbled)
Quartzite (SiO2)
metamorphic
Brachiopod Fossil in Chert
Phylum Brachiopoda within Microcrystalline Quartz (SiO2)
sedimentary
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)
metamorphic