Mineral (Processed Alloy)

Granite

Intrusive Igneous Rock

Vein-filled Basalt or Diabase Pebble

Mafic igneous rock with quartz/calcite veins

Granite (Dioritic or Hornblende-rich)

Phaneritic Plutonic Felsic to Intermediate Igneous Rock

Porphyry

Porphyritic Igneous Rock

Weathered granite or granitic pegmatite

Coarse-grained quartz–feldspar–mica rock; likely granite, possibly pegmatitic granite

Quartz Pebble

Silicon dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

White Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Water-Worn)

Silicon Dioxide (SiO2)

Limestone with Quartz/Calcite Veins

Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)

Chert (Nodule)

Silicon Dioxide (SiO2)

Obsidian

Volcanic Glass (Amorphous Silica)

Chert (Field Stone/Jasper variety)

Microcrystalline Quartz (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Schist

Metamorphic Rock (Schist)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Quartz Pebble (Tumbled / River Pebble)

Silicon Dioxide (SiO2)

Clear Quartz Crystal (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Schist

Mica Schist

Quartz Pebble

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Granite Pebble (Pink/Orthoclase Granite)

Granite (rich in Potassium Feldspar / Orthoclase)

Quartz Geode

Macrocrystalline Quartz (SiO2) within a geode structure

Watermelon Tourmaline in Quartz Matrix

Elbaite (complex Borosilicate) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

Quartzite with Quartz Geode / Vug

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

Quartz Geode in Sedimentary Matrix

Silicon Dioxide (SiO2) within a limestone/dolostone host

Quartz Pebble

Silicon dioxide (SiO2)

Granite

Granite (Felsic Plutonic Igneous Rock)

Quartz Druzy

Silicon Dioxide (SiO2)

Schist

Mica Schist

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Muscovite Mica (Granitic Pegmatite)

Muscovite - KAl2(AlSi3O10)(OH)2

Likely tumbled quartz/chalcedony

Quartz (SiO₂), possibly milky quartz or pale chalcedony

Smoky quartz (rough, water-worn crystal)

Quartz, silicon dioxide (SiO₂), smoky variety

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)