River Pebble (Greywacke / Basalt Pebble)
Indeterminate Rounded Pebble (composed of quartz, feldspar, or mafic minerals)
sedimentary
Category
Synthetic (Not A Natural Rock)
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Basalt River Stone
Basalt
igneous
Beach Pebble (Nephrite Jade / Chalcedony)
Ca2(Mg,Fe)5Si8O22(OH)2 / SiO2
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Gemstone Tree Brooch (Agate and Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Agate Geode Slice
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Blue Dyed Agate Geode Slice
Chalcedony (Silicon Dioxide, SiO2) with artificial cobalt/iron-based dye
mineral
Smelter Slag
Anthropogenic Silicate Slag
igneous
Basalt Xenolith in Matrix
Basaltic Mafic Xenolith / Ultra-mafic Inclusion
igneous
Rounded granitic pebble
Granite, likely biotite granite or granodiorite
igneous
Smoky Quartz (Tumbled)
Smoky Quartz (SiO2 - Silicon Dioxide)
mineral
Dyed Agate Slice
Silicon Dioxide (SiO2)
mineral
Shale
Shale (Lutite)
sedimentary
Vein-filled Sedimentary Rock
Silicified sedimentary rock with quartz/calcite vein
sedimentary
Pumice
Vesicular Rhyolite or Trachyte (High-silica volcanic glass)
igneous
Sandstone
Arenite
sedimentary
Chalcedony (Agate / Quartz Beach Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (Siliclastic sedimentary rock, primarily SiO2)
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Glazed Ceramic Tile
Fused Silicate-Clay composite
Synthetic (Man-made material mimicking natural stone)
Scoria
Vesicular Mafic Igneous Rock
igneous
Granite (Weathered)
Plutonic Igneous Rock (Granitic)
igneous
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Granite
Granite (Phaneritic Igneous Rock)
igneous
Slag
Metallurgical Slag
igneous
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Dyed or treated turquoise-like tumbled stone
Likely turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O), though blue-green magnesite or howlite imitation is possible
mineral
Rough Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Clear Quartz / Diamond (untested)
Silicon Dioxide (SiO2) or Carbon (C)
mineral
Carnelian Agate Beads
Silicon Dioxide (SiO2)
gemstone
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Polished citrine quartz point
Quartz, silicon dioxide (SiO₂), yellow-orange variety commonly sold as citrine; possibly heat-treated amethyst
mineral
Yellow Quartz / Chalcedony
Silicon Dioxide (SiO2)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide - SiO2)
mineral
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Asphalt
Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)
Sedimentary
Mixed tumbled stone collection
Assorted minerals, likely including quartz, jasper, agate, and possibly obsidian or hematite
mineral