Basalt with Quartz Vein
Basalt (extrusive igneous rock) with Quartz (SiO2) inclusion
igneous
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
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Basalt pebble
Basalt (mafic extrusive rock)
igneous
Mixed River Stones and Minerals
Mixed Silica-rich Stones (Quartz, Agate, Jasper, Sandstone, Dalmation Stone)
sedimentary
Mossy Rock
Mixed lithology rock with Bryophyta (moss)
sedimentary
Porphyritic Basalt
Porphyritic Basalt
igneous
Rhyolite Pebble
Rhyolite
igneous
Conglomerate (Asphaltic/Anthropogenic)
Clastic sedimentary rock / Bituminous mixture
sedimentary
Slag (Industrial Glass)
Anthropogenic Amorphous Vitreous Silicate
mineraloid
Vesicular Basalt (Scoria)
Aphanitic Mafic Igneous Rock with Vesicular Texture
igneous
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Basalt Pebble
Extrusive mafic igneous rock
igneous
Vesicular Basalt
Extrusive mafic igneous rock
igneous
Quartz with Mica Schist (Pegmatite Specimen)
SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)
Igneous/Metamorphic Hybrid
Amethyst (Geode Fragment)
Silicon Dioxide with iron impurities (SiO2)
mineral
Golden Mica Schist
Mica Schist (primarily Muscovite/Biotite with Quartz)
metamorphic
Quartz fragment (Pebble)
Silicon Dioxide (SiO2)
mineral
Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Sandstone (with potentially metamorphic or basaltic bands)
Arenite / Lithic Wacke
sedimentary
Gneiss Pebble
Gneiss (High-grade metamorphic rock)
metamorphic
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
River Pebble (Gneiss or Granite)
Metamorphic Rock (likely Gneiss or Granitic composition)
metamorphic
Slag (Industrial Glass/Byproduct)
Anthropogenic Vitreous Silicate
igneous (anthropogenic)
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Ferrocoke or Slag
Anthropogenic pyrometallurgical residue
igneous
River Pebble (Gneiss / Granitic Schist)
Metamorphic Rock (Quartz-Feldspar-Mica assembly)
metamorphic
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Basalt (River Rock)
Basalt (Mafic volcanic rock)
igneous
Mixed polished river stones
Likely quartz, quartzite, chert/jasper, and possibly limestone or marble
mineral
Iron Slag
Anthropogenic pyrometallurgical byproduct
igneous
Asphalt concrete
Anthropogenic conglomerate
sedimentary
Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)
Porphyritic Basalt
igneous
Basalt Pebble
Basalt (Mafic volcanic rock)
Igneous
Smoky Quartz (Polished)
Silicon Dioxide (SiO2)
mineral
Basalt River Pebble
Basalt (Mafic Extrusive Igneous Rock)
igneous
Engineer Quartz/Quartzite
SiO2 (Silicon Dioxide with binders)
Sedimentary or metamorphic-derived
Yellow Quartz (possibly dyed)
Silicon Dioxide (SiO2)
mineral
Quartz-rich granite pebble
Granite, composed mainly of quartz, feldspar, and mica
igneous
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Quartz pebble (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Slag
Glassy silicate byproduct (anthropogenic material)
industrial byproduct
River Cobble with Algae Patina
Weathered Chert or Quartzite pebble (SiO2 dominated)
sedimentary