Sandstone
Arenite (SiO2 primarily)
sedimentary
Category
Mineral, Part Of A Rock
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Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Amber
Succinite (Resinite), C10-H16-O
mineral
Chalk (Calcitic)
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
sedimentary
Chert (varietal: Flint Pitted Pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth (Partial)
Elasmobranchii (fossil tooth fragment)
sedimentary
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Jasper
Jasper (SiO2 plus impurities)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Jadeite Jade
Jadeite (Sodium Aluminum Silicate, NaAlSi₂O₆)
metamorphic
Petrified Wood
Silicified Wood (primarily Quartz or Chalcedony, SiO2)
mineral
Charnockite
Orthopyroxene-bearing granite (Charnockite)
metamorphic
Tumbled carnelian
Carnelian, a red-orange variety of cryptocrystalline chalcedony (SiO₂)
gemstone
Glauconitic Siltstone / Mudstone
Glauconitic Pelite
sedimentary
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Granite
Granite
igneous
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Rainbow Moonstone (White Labradorite)
White Labradorite (Feldspar variety, (Na,Ca)(Al,Si)4O8)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Granite (Pink/Red Granite)
Phaneritic Igneous Rock (primarily SiO2, KAlSi3O8, NaAlSi3O8)
igneous
Weathered basalt pebble
Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine
igneous
Red Scoria (Lava Rock)
Scoria (highly vesicular basaltic/andesitic rock)
igneous
Tektite (Indochinite)
Tektite (Natural Glass, SiO2 + Al2O3)
mineral
Tektite (Indochinite)
Tektite (natural glass, SiO2 + Al2O3)
mineral
Pink Granite (Crystalline Granite)
Igneous Intrusive Rock (Felsic Plutonic)
igneous
Granite Cobble
Granite
igneous
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Tangerine Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite coatings
mineral
Beryl (Emerald Variety)
Beryllium Aluminum Silicate (Be3Al2(SiO3)6)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
River Pebble (Greywacke or Basaltic)
Massive Greywacke or Basaltic Andesite
sedimentary or igneous
Crushed Stone / Greywacke
Greywacke (Indurated Sandstone)
sedimentary
Quartz (specifically Milky Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Quartzite pebble
Quartzite (primarily SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral