Amethyst (Scepter/Double Terminated Point)
Silicon Dioxide (SiO2)
mineral
Category
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Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Blue Lace Agate
Cryptocrystalline Quartz (SiO2) with trace minerals
sedimentary
Sandstone Concretion
Septarian Concretion (Nodule)
sedimentary
Greenstone / Diorite
Intermediate plutonic igneous rock
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pink Dyed Agate
Silicon Dioxide (SiO2) - Variety Agate
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Rock Salt / Halite Crust
Halite (Sodium Chloride, NaCl)
sedimentary
Banded Agate (with Quartz Geode Center)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Quartz with Iron Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Blue Lace Agate (Banded Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Chert (Flinty variety)
Microcrystalline Quartz (SiO2)
sedimentary
Sunkissed Quartz or Hematoid Quartz
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
mineral
Agate (or Chalcedony)
Silicon Dioxide (SiO2)
mineral
Pink Tumbled Agate
Microcrystalline Quartz (SiO2)
sedimentary
Rhyolite
Rhyolite (High-silica volcanic rock)
igneous
Jasper-Agate Conglomerate (Potentially Puddingstone)
Jasper-cemented Silicate Aggregate (SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon-based sedimentary-metamorphic rock)
metamorphic
Quartz with Limonite Staining
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
Mineral
Moonstone (Adularia)
Potassium aluminum silicate (KAlSi3O8)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Ironstone (Limonitic/Hematitic Sandstone)
Ferruginous sandstone (predominantly Fe2O3 and FeO(OH))
sedimentary
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Ironstone (likely siderite or goethite-rich siltstone)
Ferruginous Siltstone
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Rosy/Clear variety)
Silicon Dioxide (SiO2)
mineral
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Bloodstone Jasper (Heliotrope)
SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz
sedimentary
Jasper (specifically Brecciated or Agated Jasper)
Silicon Dioxide (SiO2) - Chalcedony with impurities
Mineral / Sedimentary
Green Jasper (Heliotrope / Bloodstone variety)
Silicon Dioxide (SiO₂)
sedimentary
Quartz (Citrine)
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Low-grade metamorphic carbonaceous rock
metamorphic
Granite
Phaneritic intrusive felsic igneous rock
igneous