Mineral And Glass

Fluorite with Quartz

Fluorite (CaF2) and Quartz (SiO2)

Clear quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Sandstone (likely with Quartz Veining)

Arenite (primarily SiO2)

Rose Quartz

Quartz (Silicon Dioxide) - SiO2

Citrine Quartz

Silicon Dioxide (SiO2) with trace Iron impurities

Black Obsidian

Obsidian (Volcanic Glass)

Obsidian (likely)

Volcanic glass, predominantly silica-rich rhyolitic composition (no fixed mineral formula)

Snowflake Obsidian

Volcanic Glass with Spherulite Inclusions (70–75% SiO2)

Potassium Feldspar (Orthoclase / Microcline)

KAlSi3O8 (Potassium Aluminum Silicate)

Clear faceted gemstone, likely quartz (rock crystal)

Quartz, silicon dioxide (SiO₂); visual identification is uncertain because the stone is heavily faceted and photographed with flash

Small metallic-looking mineral/rock fragment

Indeterminate from image; possibly galena, hematite, or metallic slag

Quartz Mineral

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Hematite)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Quartz Geode or Vein Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz / Quartz Crystal)

Silicon Dioxide (SiO2)

Milky Quartz with Algae/Chlorite

Silicon Dioxide (SiO2)

Quartz with Orthoclase Feldspar

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)

Muscovite Mica in Quartz

Potassium Aluminum Silicate Hydroxide (KAl2(AlSi3O10)(OH)2) and Silicon Dioxide (SiO2)

Rounded quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly chalcedony or milky quartz

Quartz crystal fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂), trigonal crystal system

Opalite

Synthetic Opalised Glass

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Iron-oxide-stained rock with a pale mineral vein

Likely limonite/goethite-stained quartz-bearing rock; exact identification is uncertain from the image

Sandstone

Arenite (SiO2 primarily)

Tumbled brown quartz (likely smoky quartz)

Quartz, silicon dioxide (SiO₂); brown coloration may be smoky quartz or iron-stained quartz

Quartz with Pyrite and Lichen

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Quartz (Smoky Quartz)

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Tumbled pink quartz, possibly rose quartz

Quartz (SiO₂), likely rose quartz; exact identification requires testing

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (likely milky quartz or quartz glass-like fragment)

Quartz, silicon dioxide (SiO₂)

Milky quartz with iron-oxide staining

Quartz, silicon dioxide (SiO₂), likely massive or coarsely crystalline; brown areas are limonite/goethite staining

Pumice or Tufa/Travertine

Pumice (if igneous) or Calcareous Tufa (if sedimentary)