Sedimentary (Silica Rich Mineral Variety)

Specular Hematite with Quartz

Ferric oxide (Fe2O3) and Silicon dioxide (SiO2)

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2)

Sandstone (Iron-stained)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Septarian Nodule (Yellow Jasper variety)

Septarian Nodule (comprising Calcite, Aragonite, and Limestone/Bentonite)

Jasper

Silicon dioxide (SiO2)

Rose Quartz

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

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

Massive Quartz (Yellow/Citrine variety)

Silicon Dioxide (SiO2)

Jasper with Hematite inclusions

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (composed mostly of SiO2 with Fe2O3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Chert (containing Iron Oxide)

Microcrystalline Quartz (SiO2)

Rhodochrosite

Manganese carbonate (MnCO3)

Agate (specifically, likely a geode slice or nodule)

Agate (a variety of Chalcedony, with chemical formula SiO2)

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

Zebra Jasper

Tumbled Opaque Chalcedony (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Chert (Nodule)

Silicon dioxide (SiO2) - Cryptocrystalline Quartz

Red Jasper

Silicon Dioxide (SiO2) - Opaque microcrystalline quartz

Chert (Jasper/Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (Jasper and Chalcedony)

Silicon Dioxide (SiO2)

Chert (variations include Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Mudstone)

Microcrystalline Quartz (SiO2)

Granite

Granite (Felsic Plutonic Rock)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Druzy Quartz (on Quartzite or Chert)

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Sandstone (Water-worn Pebble)

Clastic Sedimentary Rock (primarily SiO2)

Dendritic Agate (also known as Dendritic Siltstone or Mudstone)

Silicon Dioxide with Manganese/Iron Oxide inclusions (SiO2 + MnO2)

Jasper

Silicon Dioxide (SiO2) with impurities

Chert Pebble with Quartz Veining

Microcrystalline Quartz (SiO2)

Blue Chalcedony and Picture Jasper Beads

Blue Chalcedony (SiO2), Picture Jasper (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Chert (Jasper/Chalcedony)

Microcrystalline Quartz (SiO2)

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2)

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Banded Calcite (often sold as Yellow Aragonite or Onyx)

Calcium Carbonate (CaCO3)

Dream Amethyst (Chevron Amethyst)

Silicon Dioxide (SiO2) with iron impurities and gamma radiation exposure

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')

Calcite (Calcium Carbonate, CaCO3)

Raw Emerald

Beryl (Be3Al2(SiO3)6) with Cr/V impurities