Mineral, Specifically A Cryptocrystalline Quartz Variety

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Blue John Fluorite

Fluorite (Calcium Fluoride), CaF2

Geode with Quartz and possibly Jasper/Hematite

Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides

Chert (specifically Flint or Jasper variant)

Microcrystalline Quartz (SiO2)

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Dyed Agate Geode (Pink/Magenta)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Chalcedony

Chalcedony (a microcrystalline variety of Quartz, SiO2)

Montana Moss Agate

Chalcedony (Silicon Dioxide, SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Red Jasper

Jasper (Silica/Silicon Dioxide, SiO2 plus iron inclusions)

Milky Quartz (Common Quartz)

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Druzy Quartz)

Silicon Dioxide (SiO2)

Yellow Jasper / Chert

Silicon Dioxide (SiO2) with Goethite or Limonite inclusions

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chert (specifically a weathered Chert nodule or fragment)

Chert; Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper Shard / Chert

Silicon dioxide (SiO2)

Black Onyx

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline or cryptocrystalline quartz (SiO2)

Chert (and Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Chert (specifically Chalcedony or Flint variation)

Microcrystalline Quartz (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with iron and magnesium inclusions

Chert (specifically Flint or Common Opal)

Silicon Dioxide (SiO2)

Carnelian

Carnelian (SiO2 - Silicon Dioxide with Iron Oxide impurities)

Lemon Quartz (Orizaba/Citrinated Quartz)

Silicon Dioxide (SiO2) with iron impurities/treatment

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2) with Limonite/Goethite

Red Jasper (Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Yellow Agate

Chalcedony (cryptocrystalline Quartz), SiO2

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper or Flint variant)

Chert (composed of microcrystalline quartz, SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Jasper

Silicon dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (lithic/greywacke variety)

Arenite (composed primarily of SiO2 with various lithic fragments)

Chert (specifically Tan/Brown Chert)

Chert (SiO2)