Synthetic Glass (Often Categorized As A Simulated Mineral)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Granite Pebble

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Chert (variant Flint/Jasper)

Microcrystalline Opaline Silica (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Rose Quartz

Rose Quartz (SiO₂)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Dendritic Jasper (River Stone)

Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)

Quartz Veinated Sandstone or Siltstone

Silicon Dioxide (SiO2) within a clastic sedimentary matrix

Common Green Opal

Hydrated amorphous silicon dioxide (SiO2·nH2O)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Rose or Clear variety)

Silicon Dioxide (SiO2)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone

Arenite (primarily SiO2)

Chert (often called Flint or Jasper based on color)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Vein in River Siltstone

Crystalline Quartz (SiO2) in Siliclastic Matrix

Clear Quartz

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine Quartz or Yellow Chalcedony)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silica / Silicon Dioxide), SiO2

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Black Sapphire

Corundum (Al2O3 with inclusions of hematite or ilmenite)

Sandstone

Arenite (primarily SiO2)

Rose Quartz

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

Quartzite with Iron Inclusions

Metamorphic Quartzite (SiO2 with Fe2O3 trace impurities)

Quartz (Chert/Chunky Chalcedony)

Silicon Dioxide (SiO2)

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

Sandstone (Quartzite Pebble)

Arenite (primarily SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Quartz (specifically a water-worn river pebble)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Green Aventurine

Silicon Dioxide (Quartz) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Quartz (Water-worn pebble)

Silicon Dioxide (SiO2)