Mineral, Variety Of Quartz

Jasper

Silicon dioxide (SiO2) with iron oxide impurities

Chert (Flint variety)

Microcrystalline Quartz (SiO2)

Banded Agate (variety of Chalcedony)

Agate (SiO2)

Olivine (likely Peridot variety)

Olivine Mineral Group (specifically Forsterite-Fayalite solid solution series); Chemical formula: (Mg,Fe)2SiO4

Obsidian

Volcanic glass (mainly SiO2 with inclusions)

Amethyst (Rose-tinted/Pale variety)

Silicon Dioxide (SiO2) with iron impurities

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert / Flint

Microcrystalline Quartz (SiO2)

Chert (often called Flint in this variation)

Silicon dioxide (SiO2) - Microcrystalline quartz

Chert (Flint)

Microcrystalline Quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Citrine

Citrine (Silicon Dioxide, SiO2)

Sandstone (Water-worn Pebble)

Clastic Sedimentary Rock (primarily SiO2)

Jasper

Jasper (Silicon Dioxide, SiO2)

Jade (likely Jadeite or Nephrite)

Jadeite (NaAlSi2O6) or Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Banded Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Amazonite

KAlSi3O8 (Potassium Aluminum Silicate) - a variety of Microcline Feldspar

Chert (and Flint)

Chert (SiO2)

Jasper (Brown Iron-Rich Variety)

Silicon Dioxide (SiO2) with Fe2O3 (Iron Oxide/Crystalline Quartz)

Jasper

Silicon dioxide (SiO2) with impurities

Quartzite

Quartzite (SiO2)

Quartz Geode

Silicon Dioxide (SiO2) in a concretionary structure

Rough Green Beryl (Emerald variety)

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Limonitic Sandstone (Stained Sandstone)

Clastic Sedimentary Rock with Iron Oxide (Limonite/Goethite) staining

Chert (Jasper/Black Chert)

Silicon Dioxide (SiO2)

Banded Onyx (Calcite Marble)

Calcite (CaCO3) - Trap-rock or Cave Onyx

Red Sandstone

Arenite (with Iron Oxide / Hematite cementation)

Chert / Flint

Microcrystalline Quartz (SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Banded Gneiss (Variety of Gneiss)

Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)

Quartz (Iron-stained or Milky Quartz)

Silicon Dioxide (SiO2)

Crazy Lace Agate

Silicon dioxide (SiO2) - a variety of banded Chalcedony (cryptocrystalline quartz)

Banded Agate (Onyx Variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chalcedony (specifically Agate or Carnelian variety)

Cryptocrystalline Silica (SiO2)

Red Sandstone

Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)

Chert (and Chert-Jasper mix)

Microcrystalline Quartz (SiO2)

Jasper

Silicon dioxide (SiO2)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with impurities

Sandstone (Picture Sandstone)

Arenite (primarily SiO2 with iron oxide impurities)