Sandstone (Quartzite-rich Pebble)
Arenite (primarily SiO2)
sedimentary
Category
Mineralogical Specimen
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Granite Pebble
Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)
igneous
Chert (containing Quartz veins)
Chert (SiO2)
sedimentary
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous
Wild Horse Magnesite
Magnesite with Hematite inclusions (MgCO3)
mineral
River Rock (likely Quartzite or Quartz-rich Siltstone)
Quartzite (SiO2)
metamorphic
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt (River Stone)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt River Stone
Basalt
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert / Flint (River Pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary
Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Granite (with mafic xenolith)
Phaneritic Felsic Plutonic Rock
Igneous
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Vesicular Basalt with Oxidized Crust
Vesicular Basalt (Iron-rich extrusive volcanic rock)
igneous
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz, SiO2)
sedimentary
Druzy Quartz (on Chalcedony/Agate base)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Chert (with Manganese Dendrites)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Fossiliferous Limestone with Crinoid stems
Calcite-rich Biogenic Sedimentary Rock (CaCO3)
sedimentary
![Arfvedsonite in Quartz (also known as Eudialyte/Garnet Syenite variety) (Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2] within a silicate matrix) — igneous](https://media.rockidentification.com/a4026c5a-8968-420a-93d2-4bffc2cc7d5f-thumbnail.jpg)
Arfvedsonite in Quartz (also known as Eudialyte/Garnet Syenite variety)
Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2] within a silicate matrix
igneous
Plagioclase Feldspar
NaAlSi3O8 – CaAlSi2O8 (Sodium-Calcium Aluminum Silicates)
mineral
Brown Jasper (Chert)
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Sandstone
Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)
sedimentary
Zebra Jasper (Zebra Stone)
Tumbled Silicon Dioxide (SiO2) with impurities
sedimentary
Emerald in Matrix (Quartz/Calcite)
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Granite
Granite
igneous
Quartz on Chlorite Schist
Chlorite Schist (Mg,Fe)3(Si,Al)4O10(OH)2 with Quartz (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Agate (Thunderegg segment)
Silicon dioxide (SiO2) - Microcrystalline Quartz/Chalcedony
mineral
River Rock (Gneiss/Schist mix)
Foliated Metamorphic Rock (Gneiss)
metamorphic
Aquamarine (Beryl)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Banded Onyx (Calcite Marble)
Calcite (CaCO3) - Trap-rock or Cave Onyx
sedimentary
Sandstone (Greywacke/Lithic Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Quartz with mica and feldspar (Pegmatite fragment)
Granitic Pegmatite (composed mainly of SiO2 with KAlSi3O8)
igneous
Glacial Quartzite Cobble
Meta-orthoquartzite (SiO2)
metamorphic
Quartzite pebble
Quartzite (primarily SiO2)
metamorphic