Quartz
Silicon Dioxide (SiO2)
mineral
Category
Mineral, Specifically A Detrital Grain
Browse mineral, specifically a detrital grain specimens identified by the Rock Identifier community.
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Sandstone (Ferruginous)
Sandstone (SiO2 with FeO(OH) cementing)
sedimentary
Conglomerate
Conglomerate (Detrital sedimentary rock)
sedimentary
Green Sandstone (Glauconitic Sandstone)
Glauconitic Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Mahogany Obsidian
Volcanic Glass with Hematite inclusions
igneous
Likely raw tourmaline crystal (black schorl)
Schorl, black tourmaline — complex boron silicate, commonly approximated as NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise and Red Coral (with Grizzly Bear Claw)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Precious Coral (Corallium rubrum)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Garnet (Almandine/Pyrope variety)
Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)
mineral
Granite Pegmatite with Tourmaline and Muscovite
Pegmatite (Feldspar: KAlSi3O8, Quartz: SiO2, Schorl: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH))
igneous
Sandstone (likely Graywacke or Siltstone variety)
Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)
sedimentary
Siltstone
Siltstone (Detrital Sedimentary Rock)
sedimentary
Muscovite
KAl2(AlSi3O10)(OH)2
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
River/Stream Pebble
Clast / Detrital Grain / Rounded Sedimentary Particle (Compositionally variable, commonly Quartz, Feldspar, Chert, or other resistant rock fragments)
Mineral, specifically a rock fragment
Conglomerate
Conglomerate rock (detrital sedimentary)
sedimentary
Granite (specifically the Ubatuba variety)
Phaneritic Igneous Rock (Granodiorite/Monzogranite)
igneous
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (Detrital Sedimentary Rock)
sedimentary
Zircon
Zircon (Zirconium Silicate, ZrSiO4)
mineral
Mahogany Obsidian Arrowhead
Obsidian (volcanic glass) with Hematite inclusions
igneous
Conglomerate
Conglomerate (Detrital sedimentary rock)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Basalt with Vesicle/Vug
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Glauconitic Sandstone
Glauconitic Quartz-Wacke / Sandstone (Fe(II),Fe(III),Al,Mg)2-3(Si,Al)4O10(OH)2
sedimentary
Granitic Sand
Detrital sediment (predominantly Quartz, Feldspar, and Mica)
sedimentary
Sandstone (Pebble)
Sandstone (arenite, arkose, wacke depending on composition)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Dalmatian Stone
Peralkaline Feldsphathic Igneous Rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Pink Feldspar
Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8
mineral