Man Made Silicate (Anthropogenic Glass)

Chert (Black Chert/Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Obsidian

Volcanic Glass (SiO2 - Silicon Dioxide with impurities)

Lepidolite

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

Lepidolite

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

Quartzite

Quartzite (Primary mineral: Silicon Dioxide, SiO2)

Quartzite

Quartzite (SiO2)

Tree Agate (or Moss Agate)

Dendritic Agate (Silicon Dioxide - SiO2)

Obsidian (worked into an arrowhead profile)

Obsidian (volcanic glass), primarily SiO2 (Silicon Dioxide)

Green Fluorite

Calcium Fluoride (CaF2)

Orange Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

Orbicular Jasper (Eye Jasper / Kambaba-like pattern)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Scoria (Lava Rock)

Scoria (Extrusive Igneous Rock / Mafic composition)

Quartzite (River Pebble)

Metamorphic Quartz (SiO2)

Cloud Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Specifically Clear to Smoky Quartz point)

Silicon Dioxide (SiO2)

Milky Quartz Vein with Iron Staining

Silicon Dioxide (SiO2)

Quartz Cobble (with Iron Staining)

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

White Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Rough Green Fluorite

Fluorite (Calcium Fluoride - CaF2)

Rose Quartz

Pink Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Manganese Ore (Psilomelane/Pyrolusite)

Psilomelane ((Ba,H2O)2Mn5O10) and Pyrolusite (MnO2)

Blue Chalcedony

Chalcedony (Silicon Dioxide, SiO2)

Smoky Quartz (Tumbled)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Smoky/Milky variety with matrix)

Silicon Dioxide (SiO2)

Quartz / Chert

Silicon Dioxide (SiO2)

Quartz (Smoky/Grey Variety)

Silicon Dioxide (SiO2)

White Marble

Recrystallized Calcite (CaCO3)

Milky Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Ferruginous Quartz

Iron-stained Quartz (Silicon Dioxide + Fe2O3 / FeO(OH))

Quartz Pebble (Water-worn)

Silicon Dioxide (SiO2)

Red Jasper (River Pebble)

Jasper (Silicon Dioxide, SiO2)

Chert (specifically Flint or Common Chert)

Microcrystalline Quartz (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)