Mineral (Evaporite)

Clear Quartz

Silicon dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Moldavite

Tektite (Impact Glass), ~80% SiO2 + Al2O3

Stichtite in Serpentine (Atlantasite)

Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4

Quartz Geode

Silicon Dioxide (SiO2) in a concretion

Quartz Geode

Quartz (Silicon Dioxide, SiO2) Geode

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Jasper Beads (Polished)

Silicon Dioxide (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Chalcedony (Common Opal or Agate)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Gold Nugget

Native Gold (Au)

Fire Opal (in matrix)

Hydrated Silica (SiO2·nH2O)

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

Amethyst

Crystalline Quartz (SiO2) with iron impurities

Herkimer Diamond (Quartz)

Silicon Dioxide (SiO2)

Chalcedony with Druzy Quartz Geode

Silicon Dioxide (SiO2)

Sodalite

Sodalite, Na8(Al6Si6O24)Cl2

Amethyst

Quartz (Silicon Dioxide with iron impurities), SiO2

Orange Quartz (Citrine Quartz)

Silicon Dioxide (SiO2) with iron impurities

Citrine Quartz Geode

Silicon Dioxide (SiO2) with iron impurities

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Zoisite with Ruby / Anyolite

Anyolite (Ca2Al3(SiO4)3(OH) with Chromian Zoisite and Tschermakite inclusions)

Amethyst (Quartz variety)

Silicon Dioxide (SiO2) with iron impurities

Caliche (also known as hardpan, calcrete, kankar)

Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.

Azurite-Malachite (often called Azerite Malachite or Azurmalachite)

Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2CO3(OH)2)

Garden Quartz (Phantom Quartz)

Silicon Dioxide (SiO2) with various inclusions (often Chlorite, Hematite, or Iron)

Red Sandstone

Arenite (with Iron Oxide / Hematite staining)

Red Sandstone

Arenite (Ferruginous Sandstone)

Jasper containing epidote (Unakite-like)

Epidotized Jasper (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))

Red Sandstone

Arenite with Iron Oxide (Hematite) cement

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)

Lepidolite

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

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)

Basalt with Quartz/Zeolite Inclusions

Porphyritic Basalt (SiO2 with Aluminosilicates)

Red Sandstone Pebble

Arenite with Hematite (Fe2O3) cement

Malachite

Copper Carbonate Hydroxide [Cu2CO3(OH)2]

Red Sandstone

Arenite (with Iron Oxide pigmentation)

Chatoyant Quartz (Cat's Eye Quartz)

Silicon Dioxide (SiO2) with fibrous inclusions of Amphibole or Rutile

Hematite (beads)

Hematite (Fe₂O₃)

Moss Agate

Silicon Dioxide (SiO2) with mineral inclusions