Igneous Rock (Volcanic Glass)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Citrine

Citrine (Silicon Dioxide - SiO2)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Red Granite

Phaneritic Plutonic Rock (High Potassium Feldspar)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Druzy Quartz on Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Blue Agate (Tumbled and Dyed)

Silicon Dioxide (SiO2) with likely organic dyes

Yellow Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Jasper (specifically Red Jasper or Iron-stained Chert)

Silicon dioxide (SiO2) with iron oxide inclusions

Blue Chalcedony

Silicon Dioxide (SiO2)

Milky Quartz (Gold-bearing Prospecting Specimen)

Silicon Dioxide (SiO2)

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Black Veined Jasper (Spiderweb Jasper)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide with Iron inclusions (SiO2)

Druzy Quartz

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine Quartz or Yellow Jasper)

Silicon Dioxide (SiO2) with iron impurities

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)

Granitic Pegmatite

Granite Pegmatite (principally KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)

Green Jasper

Silicon Dioxide (SiO2) with impurities

Bloodstone (also known as Heliotrope)

Silicon Dioxide (SiO2) - variety of Chalcedony

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite/Limonite)

Amygdaloidal Basalt

Basalt with secondary mineral infilling

Granite

Granite

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Granite

Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)

Rose Quartz

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

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pink Granite (Alkali Feldspar Granite)

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8)

Moss Agate

Chalcedony (Silicon Dioxide with inclusions) - SiO2

Carnelian Agate

Silicon Dioxide (SiO2) with iron oxide impurities

Amethyst

SiO2 (Silicon Dioxide with Iron impurities)

Epidosite

Epidosite (Metasomatic rock consisting mainly of Epidote and Quartz)

Diorite (Dalmatian Stone)

Phaneritic Plutonic Diorite

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)