Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Category
Synthetic (Not A Natural Rock)
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River Pebble / Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Sandstone (likely Quartzose type)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
sedimentary
Black Tourmaline (Schorl)
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Quartz (Milky Quartz / Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone Pebble
Arenite (Sandstone)
sedimentary
Smoky Quartz
Smoky Quartz (SiO2: Silicon Dioxide)
mineral
Sandstone
Arenite (major component SiO2)
sedimentary
Quartz-rich granite or granitic pebble
Granite; primarily quartz (SiO₂), potassium feldspar, plagioclase, and minor mica/iron oxides
igneous
Rounded granite cobble
Granite; chiefly quartz, feldspar, and mica/amphibole
igneous
River Rock (Basalt or Sandstone)
Clastic Sedimentary Rock or Extrusive Mafic Igneous Rock
igneous or sedimentary
Blue Topaz
Aluminum Silicate Fluoride Hydroxide - Al2SiO4(F,OH)2
gemstone
Basalt (Vesicular)
Vesicular Basalt
igneous
Granite
Intrusive Igneous Rock
igneous
Travertine / Tufa
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone (Stream-rounded)
Arenite (SiO2 based)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone Pebble
Sandstone (Silicon dioxide-rich clastic sedimentary rock)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Sandstone Pebble
Arenite (SiO2 primarily)
sedimentary
Gravel (Crushed Stone Aggregates)
Mixed Siliciclastic / Carbonate Aggregate
sedimentary
Quartz Geode with Calcite/Siderite
Crystalline Silicon Dioxide (SiO2) with Carbonate inclusions
mineral
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Yellow Quartz or Citrine Geode/Cluster
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Shale
Fissile mudstone (Shale)
sedimentary
Travertine
Calcium Carbonate (CaCO3)
sedimentary
Granite Pebble
Intrusive Igneous Rock
igneous
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz pebble (Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Granite and Mixed Landscape Gravel
Plutonic Igneous Rock / Weathered Alluvium
igneous
Quartz Pebble (Beach Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Iron-stained Quartzite
Metamorphic Quartz (SiO2) with limonite/hematite staining
metamorphic
Sandstone
Arenite (predominantly Quartz Sandstone)
sedimentary
Sandstone (likely Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Chert / Flint Nodule
Cryptocrystalline quartz (SiO2)
sedimentary