Synthetic (Not A Rock Or Mineral)

Granite

Granite (Felsic Plutonic Rock)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Dendritic Agate

Dendritic Agate (Silicon Dioxide with Manganese or Iron Oxide inclusions, SiO2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxides

Black Obsidian

Obsidian (Volcanic Glass)

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with iron oxide impurities

Desert Rose (also known as Sand Rose)

Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions

Halite

Halite (Sodium Chloride, NaCl)

Halite

Halite (Sodium Chloride, NaCl)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

White Quartz Pebble (Milky Quartz)

Silicon Dioxide (SiO2)

Eclogite

Eclogite (Omphacite + Pyrope)

Geode with Quartz Crystal Cavity

Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix

Granite

Granite (High-silica plutonic rock)

Conglomerate (Puddingstone)

Conglomerate (specifically, clastic sedimentary rock)

Sandstone

Arenite (primarily Quartz, SiO2)

Jasper (Multi-color Chert)

Silicon dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Pink Anthracite Coal (dyed)

Anthracite Coal (Artificially Colored)

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Basalt with Quartz Veins

Basalt (complex silicate) with Quartz (SiO2) intrusions

Agate

Silicon Dioxide (SiO2)

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Dyed Blue Agate

Silicon Dioxide (SiO2)

Satin Spar (Selenite)

Gypsum (CaSO4·2H2O)

Druzy Quartz (on Chalcedony/Agate base)

Silicon Dioxide (SiO2)

Sandstone Pebble

Arenite (primarily SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Fe2O3 staining)

Basalt with Quartz/Plagioclase Inclusions

Mafic volcanic rock (Basaltic)

Milky Quartz

Silicon Dioxide (SiO2)

Geode (unopened) or Calcareous Nodule

Siliceous or Calcareous Concretion/Nodule

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Quartz (Specifically Clear to Smoky Quartz point)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)