Honey-colored chalcedony (rough agate/chert)
Microcrystalline quartz, SiO₂; likely chalcedony with iron-oxide staining
mineral
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Man Made Material
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Rose Quartz
Silicon Dioxide (SiO2) with trace elements of titanium, iron, or manganese
mineral
Green beryl (likely aquamarine-grade beryl)
Beryl, Be₃Al₂Si₆O₁₈; blue-green color is caused mainly by iron
mineral
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Flint / Chert
Silicon dioxide (SiO2)
sedimentary
Magnetite-rich iron ore (probable magnetite schist)
Magnetite (Fe₃O₄) in a foliated metamorphic matrix, possibly magnetite–biotite schist
metamorphic
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Red Sandstone
Arenite (predominantly Quartz with Hematite cementation)
sedimentary
Malachite-bearing copper ore
Malachite, Cu₂CO₃(OH)₂, likely mixed with chrysocolla, copper minerals, and iron oxides
mineral
River Rock (Quartzite/Chert conglomerate)
Quartzite (SiO2)
metamorphic
Peridotite
Peridotite (Ultramafic Rock)
igneous
Chert (specifically Yellow or River Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Weathered rhyolite or felsic volcanic rock
Rhyolite, commonly quartz–alkali feldspar–plagioclase with iron-oxide alteration
igneous
Weathered iron-rich rock, possibly laterite or altered basalt
Probable ferruginous basalt/lat eritic material; exact identification requires testing
igneous
Rounded gray-brown cobble, likely weathered sandstone or quartzite
Tentatively quartz-rich sandstone (SiO₂-dominated); exact identification requires hardness and acid tests
sedimentary
Weathered quartzite cobble
Quartzite, predominantly crystalline SiO₂
metamorphic
Graphite-bearing schist (probable)
Graphite–quartz–mica schist; chiefly graphite (C), quartz (SiO₂), and mica
metamorphic
Weathered iron-rich sandstone or lateritic rock
Quartz-rich sandstone with iron-oxide/hydroxide cement; possible goethite-bearing laterite
sedimentary
Likely weathered sandstone or iron-stained quartzite fragment
Quartz-rich sandstone (predominantly SiO₂; exact identification uncertain from image)
sedimentary
Garnet
Garnet group species (likely Almandine, Fe3Al2(SiO4)3)
mineral
Basalt with Peridotite Inclusion
Mafic Volcanic Rock (Extrusive Igneous) with Ultramafic Xenolith
igneous
Petrified Wood
Silicified wood (principally SiO2)
fossil
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Rose Quartz
Silicon dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Polished dark-green stone, possibly serpentine or nephrite jade
Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (actinolite–tremolite amphibole)
metamorphic
Cubic Zirconia (Simulated Diamond)
Zirconium dioxide (ZrO2)
mineral
Bicolor Quartz Tumble
Silicon Dioxide (SiO2)
mineral
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2) with Iron Oxide impurities
sedimentary
Milky Quartz (Tumbled Pebble)
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
Oolitic Limestone
Oolite (Sedimentary Calcium Carbonate)
sedimentary
Sandstone
Arenite (predominantly SiO2 quartz grains)
sedimentary
Likely polished dark stone or glassy mineral bead
Indeterminate; possibly obsidian, hematite, or a dark agate
mineral
Basalt Scoria
Scoria (vesicular basalt)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Limestone
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Limestone
Sedimentary rock composed mainly of calcium carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary