Quartz Vein in Host Rock (Gneiss/Schist)

Silicon Dioxide (SiO2) within a metamorphic matrix

metamorphic

Basalt

Basalt

igneous

Quartz Geode Fragment

Silicon Dioxide (SiO2)

mineral

Chert (and/or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Chert (specifically Flint or Common Chert)

Chert (Cryptocrystalline Silica, SiO2)

sedimentary

Moonstone (specifically White Moonstone or Girasol Quartz)

Potassium aluminum silicate (KAlSi3O8)

mineral

Granodiorite

Granodiorite (containing Quartz, Plagioclase, Orthoclase, Biotite/Hornblende)

igneous

Diorite (Salt and Pepper Rock)

Diorite

igneous

Amethyst

Silicon dioxide (SiO2)

mineral

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O

mineral

Mixed Tumbled Stones Collection

Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)

multiple

Obsidian

Volcanic Glass (SiO2)

igneous

Rose Quartz

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

mineral

Pyrite

Iron Sulfide (FeS2)

mineral

Pink Dyed Agate

Silicon Dioxide (SiO2) with synthetic pigment

mineral

Shungite

Non-crystalline carbonoid (Shungite)

metamorphic

Charoite

Charoite, K(Ca,Na)2Si4O10(OH,F)·H2O

metamorphic

Quartz Pebble

Silicon Dioxide (SiO2)

mineral

Ambergris (Geological/Organic Specimen)

Ambra grisea (Produced by Physeter macrocephalus)

organic material

Chert (Jasper type)

Microcrystalline Quartz (SiO2)

sedimentary

Basalt with Magnetite

Crystalline Basalt (Primarily Plagioclase and Pyroxene) with Magnetite (Fe3O4)

igneous

Granodiorite (or Granite) Pebble

Phaneritic Felsic Igneous Pebble

igneous

Smoky Quartz

Smoky Quartz (SiO2)

mineral

Obsidian

Obsidian (Amorphous volcanic glass, predominantly SiO2)

igneous

Granitic Quartz with Feldspar

Granite (composed primarily of SiO2 and KAlSi3O8)

igneous

Granite

Phaneritic Plutonic Felsic Rock

igneous

Ambergris

Ambra grisea (Metabolic byproduct)

Organic (Geological relative)

Fluorite (Rainbow Fluorite)

Calcium Fluoride (CaF2)

mineral

Granodiorite

Granodiorite (NaAlSi3O8 to CaAl2Si2O8 / SiO2)

Igneous

Chrysoprase

Chalcedony (Silicon Dioxide, SiO2)

mineral

Green Aventurine

Silicon dioxide (SiO2) with inclusions of Fuchsite

metamorphic

Amethyst (Faceted)

Silicon Dioxide (SiO2) with iron impurities

mineral

Basalt

Extrusive mafic igneous rock

igneous

Schist

Mica Schist

metamorphic

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

igneous

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

mineral

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

igneous

Chert (specifically Flint or Common Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Basalt Pebble

Basalt

igneous

Red Jasper (Opaque Chalcedony)

Jasper / Silicon Dioxide (SiO2) with Ferric Iron inclusions

mineral

Limestone

Limestone (Calcium Carbonate - CaCO3)

sedimentary

Banded Calcite (Tumbled)

Calcium Carbonate (CaCO3)

Mineral