Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous
Category
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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)
Basalt
Extrusive mafic igneous rock
igneous
Copper Ore / Altered Granodiorite
Cupriferous rock with silicate gangue
mineral
Gossan (with Limonite/Hematite coating)
Ferruginous Gossan (Fe2O3·nH2O / Fe2O3)
sedimentary
Red Sandstone
Arenite (primarily quartz with iron oxide cement)
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Sandstone
Quartz Sandstone (predominantly)
Sedimentary
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Rounded quartz-rich pebble
Chert or quartzite pebble (tentative; mostly microcrystalline quartz, SiO₂)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous
Basalt
Basalt (Mafic Extrusive)
igneous
Granite
Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)
igneous
Sandstone (Weathered Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Xenolith in Basalt
Mafic Igneous Rock with Felsic Inclusion
igneous