Mineral And Glass

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Green Quartz (Prasiolite/Adventurine)

Silicon Dioxide (SiO2) with inclusions

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Green Fluorite

Calcium Fluoride (CaF2)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with Iron Oxide impurities

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Sandstone (Stream Pebble)

Arenite (primarily SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Clear Quartz Point

Silicon Dioxide (SiO2)

Synthetic/Man-made glass (often mistaken for a mineral)

Goldstone (Brown/Gold variety)

Aventurine Glass (SiO2 with Copper inclusions)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Aventurine

Silicon Dioxide (SiO2) with inclusions

Orange Calcite

Calcium Carbonate (CaCO3)

Celestine (or Celestite)

Strontium sulfate (SrSO4)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Green Aventurine

Quartzite (variety Aventurine) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)

Red Jasper

Jasper (Silicate Mineral - SiO2)

White Quartz Pebble

Silicon Dioxide (SiO2)

Ferruginous Sandstone (with possible Epidote/Chlorite coloring)

Sandstone (SiO2 dominated with Fe2O3 staining)

Epidosite

Epidosite (Metasomatic rock consisting mainly of Epidote and Quartz)

Quartz Pebble (Sea Glass-like texture)

Silicon Dioxide (SiO2)

Quartz Geode

Crystalline Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Agate Geode

Chalcedony (cryptocrystalline SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz with Chlorite or Hornblende inclusions

Silicon dioxide (SiO2) with phyllosilicate or amphibole inclusions

Green Quartz (Aventurine)

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Obsidian

Volcanic Glass (predominantly SiO2)

igneous

Mahogany Obsidian

Volcanic Glass (SiO2 + Fe2O3)

igneous

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Milky Quartz (among River Rock)

Quartz (Silicon Dioxide, SiO2)

Mineral

Quartzite

Quartzite (primarily SiO2)

Fluorite (Polished Point/Tower)

Calcium Fluoride (CaF2)