Synthetic Glass (Often Categorized As A Simulated Mineral)

Rose Quartz

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

Tourmaline (likely Schorl)

Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4

Veined Quartz

SiO2 (Silicon Dioxide)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Red Jasper

Jasper (a variety of Chalcedony, SiO₂ with impurities)

Quartz Vein in Host Rock (Pebble)

Quartz (SiO2) with sandstone or siltstone matrix

Muscovite Schist

Mica Schist (primarily KAl2(AlSi3O10)(OH)2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3/FeO(OH)) inclusions

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

Quartz (SiO₂ - Silicon Dioxide)

Jasper

Silicon Dioxide (SiO2) - a variety of Chalcedony (Cryptocrystalline Quartz)

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Orange Quartzite / River Pebble

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Red Jasper (Opaque Chalcedony)

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

Milky Quartz

Silicon Dioxide (SiO2)

Beryl (Aquamarine) in Matrix

Beryllium aluminum silicate (Be3Al2(SiO3)6)

Chert (with Iron Staining)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz River Cobble

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide with Hematite/Limonite inclusions (SiO2 + Fe2O3)

Milk Quartz (Tumbled)

Silicon Dioxide (SiO2)

Fire Agate (Crackle Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Limonite (often after Hematite or Goethite)

Limonite (FeO(OH)·nH2O)

Slag (Industrial Glass)

Anthropogenic Vitreous Slag (Post-industrial byproduct)

Quartzite with Iron Mineral Banding

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining

Yellow Quartzite Pebble

Metamorphosed Sandstone (SiO2 with iron oxide impurities)

Citrine Geode (or Druzy Citrine)

Silicon Dioxide (SiO₂) - a variety of Quartz

Quartzite

Quartzite (predominantly SiO2)

Citrine

Quartz (SiO₂) variety

Chert (Smoky variety)

Microcrystalline Quartz (SiO2)

Chert (Green variety)

Microcrystalline Opaline/Quartz (SiO2)

Snowflake Obsidian

Spherulitic Obsidian (primarily SiO2 with Cristobalite inclusions)

Amethyst

Quartz (SiO2) with trace iron impurities

Amethyst

Amethyst is a variety of Quartz (SiO₂)

Pyrite on Quartz (Fool's Gold in Quartz)

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Jasper

Silicon dioxide (SiO2)

Amethyst

SiO2 (Silicon Dioxide)

Milky Quartz (Tumbled)

Quartz (Silicon Dioxide, SiO2)

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

Jasper (specifically Red Jasper)

Silicon Dioxide with Iron Oxides (SiO2 + Fe2O3)