Tourmalinated Quartz
Silicon Dioxide (SiO2) with inclusions of Schorl (NaFe2+3Al6Si6O18(BO3)3(OH)3OH)
mineral
Category
Mineralogical Specimen
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Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Agate (specifically Chalcedony nodule)
Silicon Dioxide (SiO2)
mineral
Chert Nodules (Limonitic Chert)
Cryptocrystalline Quartz (SiO2) with Hydrated Iron Oxides
sedimentary
Bivalve Fossil (Internal Mold/Steinkern)
Class Bivalvia (Fossilized Mold)
sedimentary
Chert (Nodular)
Microcrystalline Silica (SiO2)
sedimentary
Jasper (specifically Chert/Ironstone)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Quartz Pebble (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 based)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz River Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Turquoise in Matrix
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Quartz Geode with Chalcedony
Crystalline Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper
Chalcedony (SiO2)
Sedimentary/Mineral
Banded Calcite (often sold as Caribbean Calcite or Honey Calcite)
Calcium Carbonate (CaCO3)
mineral
Jasper
Silicon dioxide (SiO2) with iron oxide impurities
sedimentary
Apache Tear (Obsidian)
Hydrated volcanic glass (SiO2 with inclusions)
igneous
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Milky and Gray)
Quartz (Silicon Dioxide, SiO2)
mineral
Jasper (Iron-rich Microcrystalline Quartz)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Banded Rhyolite (likely Green Jasper/Agate variety)
Silicon Dioxide (SiO2) with mineral inclusions
igneous
Coquina or Fossilized Shell Fragment
Calcium Carbonate (CaCO3) / Biogenic Limestone
sedimentary
Quartzite with inclusions
Quartzite
metamorphic
Quartzite with Sandstone/Siltstone matrix
Metamorphosed Arenite (SiO2)
metamorphic
Silicon
Element Si
mineral
Labradorite (a variety of Anorthosite or Plagioclase)
Labradorite (member of Plagioclase Feldspar series), (Ca,Na)(Al,Si)4O8
igneous
Sandstone (Quartzose Sandstone Pebble)
Arenite (primarily SiO2)
sedimentary
Granite (Pink/Red)
Phaneritic Igneous Rock (Rich in K-Feldspar)
igneous
Hematite
Iron(III) oxide (Fe2O3)
mineral
Sandstone Pebble (Quartzite-rich)
Clastic Terrigenous Sedimentary Rock (SiO2 dominant)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (specifically Milky/Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Sandstone (specifically an Iron-Concretion)
Arenite with Iron Oxide (Limonite/Goethite) cementation
sedimentary
Red Jasper with Quartz Veining
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Quartz Pebble (with Iron Inclusions)
Silicon Dioxide (SiO2)
mineral
Yooperlite (Syenite clasts with Sodalite)
Fluorescent Sodalite-bearing Syenite
igneous
Yellow Chalcedony
Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)
Mineral