Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Category
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Chert (and/or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Granite
igneous
Pyrite in Matrix (likely Quartz or Schist matrix)
Iron Sulfide (FeS2)
mineral
Aragonite (specifically Mexican Marbled Onyx)
Aragonite (Calcium Carbonate, CaCO3)
mineral
Basalt River Stone
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Blue Lace Agate
Chalcedony (a form of Quartz) - SiO2
Mineral
River Quartzite (Water-worn Quartzite)
Quartzite (primarily SiO2)
metamorphic
Synthetic Resin / Plastic Figurine
Synthetic Polymer (Copolymer of Polyethylene or Resin)
Mineraloid-like Synthetic Material
Agate Geode Node
Cryptocrystalline Quartz (SiO2)
mineral
Shale (or Mudstone)
Siltstone/Argillite (composed mainly of clay and silt-sized particles)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Jasper
Cryptocrystalline Quartz (SiO2)
sedimentary
Cryptocrystalline Quartz (Agate/Chert)
Silicon dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Honey Chert or Chalcedony Pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper (likely river-worn)
Silicon Dioxide (SiO2)
sedimentary
Ammonite Fossil (Polished Half / Cleoniceras)
Ammonoidea (Subclass), often Cleoniceras genus; fossilized with Calcite (CaCO3) and Aragonite
Sedimentary
Botryoidal Aragonite (Cave Popcorn)
Aragonite (Calcium Carbonate, CaCO3)
mineral
Chert (Brown Variety)
Silicon dioxide (SiO2)
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Fuchsite (Green Muscovite)
K(Al,Cr)2(AlSi3O10)(OH)2
Mineral
Banded Agate (specifically Botswana Agate appearance)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Fossiliferous Chert (with Fossil Shells)
Silicon Dioxide (SiO2) with biogenic inclusions
sedimentary
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Basalt
Mafic Volcanic Rock (Primarily Plagioclase feldspar and Pyroxene)
Igneous
Quartz Veined Basalt
Mafic Volcanic Rock with Microcrystalline Quartz (SiO2)
igneous
Chert (Jasper/Mudstone variant)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
sedimentary
Gneiss
Gneiss
metamorphic
Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Garnet Schist
Almandine-Garnet Mica Schist
metamorphic
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Orbicular Rhyolite (Rainforest Jasper)
Rhyolite containing Spherulites (SiO2 with impurities)
igneous
Gold-bearing Quartz with Iron Oxides
Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)
mineral
Amethyst
Silicon Dioxide (SiO2) with traces of Iron and Manganese
mineral
Granodiorite Pebble
Granodiorite
igneous
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral