Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Category
Industrial Byproduct (Anthropogenic Rock)
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Ferruginous Quartz
Quartz with Iron Oxide inclusions (SiO2 + Fe2O3)
mineral
Small metallic meteorite-like specimen
Unclassified iron-rich meteorite candidate; possibly an ordinary chondrite or terrestrial slag
meteorite
Likely obsidian (black volcanic glass)
Obsidian; predominantly rhyolitic volcanic glass, often ~70–75% SiO₂
igneous
Granite Pegmatite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Smoky Quartz
Smoky Quartz (SiO2: Silicon Dioxide)
mineral
Basalt
Basalt
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Likely dark green-gray metamorphic pebble
Indeterminate; possibly chlorite schist, serpentinite, or amphibolite
metamorphic
Limestone with Fossil Inclusion
Calcium Carbonate (CaCO3)
sedimentary
Pink Granite
Granite (Alkali-feldspar granite)
igneous
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Pegmatite
Pegmatite (felsic intrusive igneous rock)
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Mudstone
Lutylite (group of fine-grained sedimentary rocks)
sedimentary
Limestone (specifically Iron-stained or Argillaceous Limestone)
Calcium Carbonate (CaCO3) with Iron Oxide (Fe2O3) impurities
sedimentary
Man-made earbud charging case (Not a rock or mineral)
Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components
Synthetic/Man-made object
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Granitic Pegmatite
Pegmatite containing Quartz, Feldspar, and Muscovite mica
igneous
Coal
Anthracite / Bituminous Coal
sedimentary
River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Sedimentary Rock (possibly composed of various minerals)
Garnet-Mica Schist
Garnetiferous Porphyroblastic Schist
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Weathered granite or granitic gneiss pebble
Granite; mainly quartz (SiO₂), feldspar, and mica, with possible gneissic alteration
igneous
Milky Quartz Vein in Mafic Rock
Quartzite vein in Metabasalt (SiO2 base)
metamorphic
Silicon
Element Si
mineral
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)
igneous
Quartz Geode (Cracked Open Fragment)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Orange Calcite (with White Calcite/Quartz matrix)
Calcium Carbonate (CaCO3)
mineral
Druzy Quartz (part of a Geode)
Silicon Dioxide (SiO2)
mineral
Uncertain polymict breccia or altered volcanic rock
Likely hydrothermally altered volcanic breccia; exact mineral identification requires testing
igneous
Rounded river or beach pebble
Likely quartz-rich sandstone or quartzite; exact identification requires a close-grained view and hardness test
sedimentary
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Pumice
Pumicite
igneous
Basalt (Beach Pebble)
Extrusive mafic igneous rock
igneous
Quartz Calcite Vug in Limestone
Calcium Carbonate (CaCO3) with Silicon Dioxide (SiO2) inclusions
sedimentary
Chalcedony/Agate
Cryptocrystalline Silica (SiO2)
mineral
Coal (Bituminous)
Organic sedimentary rock primarily consisting of carbon (C)
sedimentary