Sedimentary Or Igneous (Secondary Formation)

Jasper (Iron-rich)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Blue Sapphire

Corundum (Al2O3)

Chert (specifically a Worked Flint/Knapped Flake)

Chert / Flint (Microcrystalline Quartz, SiO2)

Geode (unopened) or Calcareous Nodule

Siliceous or Calcareous Concretion/Nodule

Red Sandstone

Arenite (high iron oxide content)

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Shale or Slaty Mudstone

Argillaceous sedimentary rock

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Red Sandstone

Arenite (with Iron Oxide)

Travertine

Terrestrial Sedimentary Form of Calcium Carbonate (CaCO3)

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Porphyritic Rhyolite (Red Porphyry)

Porphyritic Rhyolite (Felsic volcanic rock)

Mookaite Jasper

Silicified Radiolarite (SiO2)

Tiger Iron

Tiger Iron (A complex combination of Hematite Fe2O3, Red Jasper SiO2, and Tiger's Eye SiO2/FeOOH)

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Blue Quartz

Quartz (SiO2) with inclusions

Limestone (Brecciated/Recrystallized)

Calcium Carbonate (CaCO3)

Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)

Quartz (SiO₂ - Silicon Dioxide)

Chert (Banded Variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Citrine Quartz Crystal Cluster

Silicon Dioxide (SiO2) with iron impurities

Citrine

Citrine (Silicon Dioxide, SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with hydrated iron oxide impurities

Jasper

Jasper (Silicate - SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with hydrated iron oxide impurities

Wonderstone (Sandstone)

Silicified Quartz Sandstone with Iron Oxide staining

Sandstone (Ferruginous)

Arenite (with Iron Oxide)

Indigo Gabbro

Gabbro (Mafic Intrusive Rock)

Sandstone (likely Arkose)

Arenite (Feldspathic Sandstone / Arkose)

Sandstone

Arenite (composed primarily of SiO2)

Jasper

Quartz (SiO2) with impurities

Jasper

Jasper (Cryptocrystalline Quartz, SiO2)

Yellow Ocher (Limonite)

Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O

Peridot and Citrine Gemstones (in a ring setting)

Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)

Limestone with Quartz/Calcite Veins

Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)

Arfvedsonite in Quartz (also known as Eudialyte/Garnet Syenite variety)

Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2] within a silicate matrix

Quartz Geode

Silicon Dioxide (SiO2) in Geode form

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Vesicular Basalt with Quartz/Chalcedony

Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)

Conglomerate

Conglomerate (Detrital sedimentary rock)