Synthetic Glass (Often Categorized As A Simulated Mineral)

Ferruginous Quartz

Silicon Dioxide (SiO2) with hematite/limonite inclusions

Quartz Cobble

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble

Metamorphic Rock (rich in SiO2)

Quartz Pebble

Silicon dioxide (SiO2)

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

Orange Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Granitoid (Pegmatitic Granite)

Granitoid with dominant Potassium Feldspar and Quartz

Chert (Flint)

Microcrystalline quartz (SiO2)

Quartz with Mica inclusions (likely Schist or Gneiss host)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Fulgurite

Fulgurite (Lechatelierite or fused sand/quartz)

Sandstone Beach Pebble

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)

Quartz pebble

Silicon Dioxide (SiO2)

Yellow Quartzite (River Pebble)

Quartzite (mainly SiO2 with iron oxide impurities)

Lepidolite

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

Quartz (Gravel fragment)

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon dioxide (SiO2)

Rough Quartz (Alluvial Pebbles)

Silicon Dioxide (SiO2)

Blue Quartzite

Metamorphosed Quartz (SiO2) with inclusions

Quartz (Small Pebble)

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Milky Quartz

Silicon Dioxide (SiO2)

Black Obsidian

Volcanic Glass (Silicon Dioxide with impurities)

Milky Quartz with Chlorite inclusion

Silicon Dioxide (SiO2) with Chlorite group inclusions

Sandstone

Arenite (primarily SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz with Iron Staining

Silicon Dioxide (SiO2)

Lepidolite

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

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Green Quartzite (or Green Jasper)

Silica (Silicon Dioxide, SiO2) with inclusions

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Quartz Fragment

Silicon Dioxide (SiO2)

Slag Glass

Amorphous Silica Glass (with metal oxide inclusions)

Vuggy Quartz on Matrix

Crystalline Silicon Dioxide (SiO2)

Yellow Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Disulfide (FeS2)

Sandstone (with Limonite staining)

Arenite (primarily SiO2 with FeO(OH)·nH2O)

Quartz with Hematite

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Massive White Quartz

Silicon Dioxide (SiO2)