Igneous And Metamorphic

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Quartz Pebble

Silicon Dioxide (SiO2)

Smoky Quartz (Tumbled)

Smoky Quartz (SiO2 - Silicon Dioxide)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz (Citrine or Iron-Stained variety)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO2)

Quartz Pebble (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz Crystal (Amethyst)

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Milky quartz cluster

Quartz (silicon dioxide, SiO₂), likely druzy or microcrystalline quartz

Black Tourmaline (Schorl)

Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)

Quartz vein rock with iron-stained matrix

Quartz (SiO₂), likely with limonite/goethite and minor feldspar or mica

Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Small rounded pebble, likely quartz-rich stone

Indeterminate from photograph; possibly microcrystalline quartz (SiO₂) or a weathered silicate pebble

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz with iron-oxide staining and matrix

Quartz, silicon dioxide (SiO₂), likely massive quartz

Milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Blue Quartz (Dyed)

Silicon Dioxide (SiO2) with artificial pigment

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon Dioxide (SiO2)

Moonstone

Orthoclase Feldspar (KAlSi3O8)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Orange Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Rough Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Citrine Quartz

Silicon Dioxide (SiO2)

Amethyst

Quartz (SiO2) with iron impurities

Tumbled Moonstone and Amazonite Chips

Orthoclase (KAlSi3O8) and Microcline (KAlSi3O8) of the Feldspar Group

Orange Calcite

Calcite (CaCO3)

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Citrine Quartz

Silicon Dioxide (SiO2)

Amethyst

Amethyst (Silicon Dioxide with iron impurities, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (specifically Citrine or Yellow Quartzite pebble)

Silicon Dioxide (SiO2)