Red Agate (Carnelian)
Chalcedony (SiO2) with iron oxide inclusions
mineral
Category
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Quartz (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)
Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)
Metamorphic
Wild Horse Magnesite
Magnesite with Hematite inclusions (MgCO3)
mineral
Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Travertine
Calcium Carbonate (CaCO3)
sedimentary
Travertine
Travertine (CaCO3)
sedimentary
Banded Agate
Agate (Cryptocrystalline Quartz, SiO2)
mineral
Jasper
Silicon Dioxide (SiO2) with impurities (mostly Iron Oxides)
Mineral
Jasper (Yellow/Brown variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Green Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe)
sedimentary
Red Moss Agate (Jasper)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Peridot (Olivine)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
mineral
Vesicular Basalt (Iron Scoria)
Aphanitic Mafic Igneous Rock with Vesicular Texture
igneous
Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
Crushed Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
River Rock (likely Quartzite or Quartz-rich Siltstone)
Quartzite (SiO2)
metamorphic
Quartzite (Iron-stained)
Quartzite (mostly SiO2)
metamorphic
Grey Agate (Tumbled)
Silicon Dioxide (SiO2)
mineral
Basalt
Mafic Volcanic Rock (composed of Plagioclase Feldspar and Pyroxene)
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Amethyst
SiO2 (Silicon Dioxide) - Purple variety of Quartz
mineral
Pyrite in Matrix (Commonly called Fool's Gold)
Iron Sulfide (FeS2)
mineral
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Orange Quartz (Citrine Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Agate (Beads)
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenic rock (composed mainly of SiO2 with Fe2O3)
sedimentary
Rhodonite
Rhodonite (Manganese silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Magnetite (potentially Hematite-rich)
Magnetite (Fe3O4)
mineral
Sodalite
Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)
mineral
Quartzite
Quartzite (mostly SiO2)
metamorphic
Green Fluorite in Host Rock
Fluorite (Calcium Fluoride, CaF2)
mineral
Dalmatian Jasper (or Dalmatian Stone)
Dalmatian Stone (A peralkaline felsite composed of feldspar, quartz, and sodic amphibole)
igneous
Que Sera Stone (Llanite)
Rhyolite Porphyry with Blue Quartz and Feldspar
igneous
Carnelian (a variety of Chalcedony)
SiO2 (Silicon Dioxide with Iron Oxide impurities)
mineral
Agate
SiO2
Mineral/Gemstone
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral