Quartzite Pebble (River Siltstone/Quartzite)
Quartzite (SiO2 composition)
metamorphic
Category
Man Made Rock (Technosol)
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Basalt
Aphanitic Mafic Volcanic Rock
igneous
Basalt (River Rock)
Basalt
igneous
Granodiorite (Gneissic texture)
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
igneous
Basalt (Vesicular)
Basalt (Extrusive Volcanic Rock)
igneous
Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)
Chalcedony (SiO₂)
Mineral (or mineraloid if microcrystalline)
Fossilized Brachiopod or Gastropod in Chert/Limestone
Phylum Brachiopoda / Mollusca
fossil
Vesicular Basalt
Vesicular Basalt
igneous
Likely weathered gneiss
Foliated metamorphic rock, commonly quartz–feldspar–mica gneiss
metamorphic
Quartz with Mafic/Chlorite Veins
Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining
metamorphic
Quartzite with Quartz Veining
Metamorphic Quartzite (SiO2)
metamorphic
Smooth river pebble
Indeterminate lithology; likely fine-grained quartz-rich sandstone, siltstone, or weathered chert
sedimentary
Basalt with inclusion
Basalt (Aphanitic-Porphyritic texture)
igneous
Basalt with Scoria
Amygdaloidal Basalt / Vesicular Basalt
igneous
Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous
Granite
Felsic intrusive igneous rock
igneous
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Sandstone Cobble with Iron Staining
Arenite with Limonite/Hematite staining
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Weathered limestone
Calcite-rich limestone (CaCO₃), possibly fossiliferous or dolomitic
sedimentary
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt
igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Chert (Jasper/Flint variety)
Microcrystalline quartz (SiO2)
sedimentary
Beaded Jewelry (Assorted Gemstones)
Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ
Mineral, Jewelry
Vesicular Basalt (Scoria)
Basalt with vesicular texture
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite Pebbles
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)
igneous
Basalt with Alteration Crust
Basalt (SiO2 range 45-52%)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt Cobble
Aphanitic Mafic Igneous Rock (Basalt)
igneous
Basalt River Cobble
Basalt (Mafic volcanic rock)
igneous
Granite
Granite
igneous
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
sedimentary
Milky Quartz Pebble with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Granite Pebble (Pegmatitic Quartz-Feldspar River Rock)
Granite / Quartz-Feldspar-Mica Aggregate
igneous
Sandstone with Desert Varnish
Arenite (SiO2 predominantly) with Ferromanganese coating
sedimentary
Generic Pebble
Lithic Fragment
sedimentary
Quartz Vein in Amphibolite / Gneiss
Quartz (SiO2) in Mafic Metamorphic Host Rock
metamorphic
River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Sedimentary Rock (possibly composed of various minerals)
Copper Ore / Altered Granodiorite
Cupriferous rock with silicate gangue
mineral