Serpentinite
Serpentinite (containing minerals of the Serpentine subgroup: Antigorite, Lizardite, and Chrysotile; formula (Mg,Fe)3Si2O5(OH)4)
metamorphic
Category
Industrial Byproduct (Anthropogenic Rock)
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Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Weathered Basalt with Iron Staining
Aphanitic Mafic Volcanic Rock
igneous
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
River Pebble (likely Quartzite or Chert)
Silicon Dioxide (SiO2) crystal conglomerate
sedimentary or metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Tumbled chalcedony (likely gray/brown agate)
Microcrystalline quartz, SiO₂ (chalcedony; possible agate variety)
mineral
Polished ocean jasper (orbicular jasper), probable
Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide and other mineral inclusions
mineral
Pumice
Pumice (Felsic vesicular volcanic glass)
igneous
Schist with Biotite Inclusion
Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Granitic Pegmatite
Granitic Pegmatite (primarily SiO2 with KAlSi3O8)
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Quartz with Schorl (Black Tourmaline)
Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Granitic Pegmatite
Pegmatite
igneous
Greenstone / Graywacke
Lithic Sandstone (Graywacke)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Diamond Plate (Steel)
Alloyed Carbon Steel or Aluminum with 'Durbar' pattern
not a rock (Man-made industrial metal)
Tumbled Agate
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist
metamorphic
Basalt (with possible quartz veinsing)
Basalt
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Granite
Granite (Phaneritic Quartz-Feldspar Rock)
igneous
Mica Schist
Mica Schist
metamorphic
Garnet in Schist (Mica Schist with Garnet Inclusion)
Garnetiferous Mica Schist (X3Al2(SiO4)3)
metamorphic
Ruby (Pinkish-Red)
Corundum (Al2O3 with Chromium trace)
mineral
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Arsenopyrite in Quartz/Host Rock
Arsenopyrite (FeAsS)
mineral
Pumice (specifically a water-worn, weathered variety)
Vesicular volcanic glass
igneous
Unidentified tan rock fragment
Likely limestone or calcareous sandstone; exact identification requires testing
sedimentary
Green Quartzite (Aventurine-like)
Quartzite (primarily SiO2 with chromium-rich mica or chlorite inclusions)
metamorphic
Quartzite
Quartzite (mainly SiO2)
metamorphic
Eclogite
Eclogite
metamorphic
Banded Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Wishing Stone with Quartz Vein
Hydrothermal Quartz Vein in Metasedimentary Matrix (primarily SiO2)
metamorphic
Rounded yellow-brown pebble
Likely iron-stained sandstone or quartz-rich river cobble
sedimentary
Coal
Bituminous Coal (organic sedimentary rock)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Pegmatite
Granitic Pegmatite
igneous
Quartzite
Quartzite (composed primarily of silica, SiO2)
metamorphic
Anthracite Coal
Anthracite (Carbon-based sedimentary-metamorphic rock)
metamorphic
Quartz / Common Quartzite
Silicon Dioxide (SiO2)
mineral