Sedimentary (Formed From Silica Deposits)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Smoky Quartz (Apache Tear Variety)

Silicon dioxide (SiO2) - Volcanic Glass

igneous

Quartz / Quartz Geode fragment

Silicon Dioxide (SiO2)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Calcite

Calcite (CaCO 3)

Quartz Druzy Geode

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate rock

Amethyst (Geode Fragment)

Silicon Dioxide (SiO2 with iron impurities)

Black Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Belemnite Fossil

Belemnitida (extinct order of Cephalopods)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Green Onyx (Banded Calcite)

Travertine (CaCO3 - Calcium Carbonate)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Amber

Fossilized tree resin (not a true mineral as it is organic and amorphous); Chemical formula is highly variable, but often approximated as C10H16O.

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Green Sandstone

Glauconitic Sandstone

Blue Calcite

Calcium Carbonate (CaCO3)

Pyrite (on Quartz matrix)

Iron Sulfide (FeS2)

Copper Ore with Malachite and Chrysocolla

Cu2CO3(OH)2 (Malachite) with Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)

Sandstone (likely Graywacke or Lithic Sandstone)

Arenite / Wacke (SiO2 based with lithic fragments)

Banded Agate (Onyx Variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Quartzite

Quartzite (SiO2)

metamorphic

Quartz (Rose or Clear variety)

Silicon Dioxide (SiO2)

sedimentary (microcrystalline quartz)

Jasper River Pebble

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Quartz Geode (partially formed)

Silicon Dioxide (SiO2)

Pink Quartz (Rose Quartz variant)

Silicon Dioxide (SiO2)

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Corundum (Ruby/Sapphire crystal)

Al2O3 (Aluminum Oxide)

Sodalite

Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Quartz (Specifically Clear to Smoky Quartz point)

Silicon Dioxide (SiO2)

Quartzite River Cobble

Quartzite (SiO2)

metamorphic

White Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Gneiss (Metamorphic Rock)

Gneiss

metamorphic

Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Limestone Pebble

Calcium Carbonate (CaCO3)