Beach Pebble (Basalt/Greywacke)
Amygdaloidal Basalt
igneous
Category
Not A Natural Rock (Man Made Composite)
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Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)
sedimentary
Jasper in Quartz (River Cobble)
Silicon Dioxide (SiO2) with Ferric Iron inclusions
sedimentary
Sandstone (with Iron Staining)
Quartz Arenite / Ferruginous Sandstone
sedimentary
Sandstone (Cross-bedded Drill Core)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Basalt (Water-worn Pebble)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Tumbled jasper or brecciated jasper
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and dark mineral inclusions
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Kimberlite
Kimberlite (Potassic ultramafic igneous rock)
igneous
Rock crystal quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Granite / Pegmatite Pebble
Felsic intrusive igneous rock
igneous
Scoria
Vesicular Mafic Igneous Rock
igneous
Basalt Pebble
Basalt
igneous
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Red Tiger's Eye
Silicified Crocidolite (Quartz pseudo-morph after Crocidolite), SiO2
metamorphic
Dyed Purple Agate
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Quartz-Arenite (with Goethite/Hematite cement)
sedimentary
Serpentine-rich serpentinite pebble
Serpentinite, composed chiefly of serpentine-group minerals (lizardite, antigorite, chrysotile), commonly with magnetite and minor brucite
metamorphic
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Ironstone Concretion
Ironstone (Siderite/Goethite/Hematite matrix)
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Septarian Nodule
Septaria (composed of Calcite, Aragonite, and Limestone)
sedimentary
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Amethyst
SiO2 (Silicon Dioxide)
mineral
Amethyst
Silicon Dioxide (SiO2) with trace Iron impurities
mineral
Desert Rose (Barite Rose / Gypsum Rose)
Barium Sulfate (BaSO4) or Hydrous Calcium Sulfate (CaSO4%22H2O)
mineral
Clear quartz sphere or polished quartz cabochon (tentative)
Quartz, silicon dioxide (SiO₂); appearance may also be consistent with ordinary glass, which cannot be ruled out from the image alone
gemstone
Weathered quartz-rich rock, possibly sandstone or quartzite
Indeterminate; likely quartz sandstone (SiO₂-rich), possibly weakly metamorphosed quartzite
sedimentary
Granite
Granite (compositional mixture of Quartz, Feldspar, and Mica)
igneous
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Cobblestones (Basalt/River Rock)
Polished lithic fragments and rounded pebbles
sedimentary
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Green Aventurine
Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Weathered quartz-rich rock, possibly pegmatite or quartzite
Quartz (SiO₂)-rich aggregate; exact identification is uncertain from the photograph
igneous
Dalmation Stone (Dalmation Jasper)
Peralkaline Rock with Feldspar and Arfvedsonite
igneous
Blue Dyed Agate
Silicon Dioxide (SiO2)
mineral
Dyed Agate
Silicon Dioxide (SiO2) with synthetic dyes
mineral