Mineral, Specifically A Rock Fragment

Dendrite (Manganese Oxide Dendrites)

Psilomelane or Pyrolusite on Matrix (typically MnO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz Point

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO₂)

Mineral

Clear Quartz Sphere

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon dioxide (SiO2)

Mineral

Clear Quartz

Silicon Dioxide (SiO2)

Snowflake Obsidian

Volcanic glass containing Spherulitic Cristobalite (SiO2)

Andesite

Intermediate Volcanic Rock (Andesite)

Gneiss

Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)

Amygdaloidal Basalt

Vesicular-Amygdaloidal Basalt (Mafic Extrusive)

Amethyst

Amethyst (Silica mineral, SiO2)

Banded Agate Geode

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)

sedimentary

Granite

Granite (Felsic Plutonic Rock)

Druzy Quartz

Silicon Dioxide (SiO2)

Caribbean Calcite

Calcium Carbonate with Argonite (CaCO3)

Granite

Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica/Amphibole)

Pyrite in Matrix (Quartz/Schist)

Iron Sulfide (FeS2)

Marble

Recrystallized Carbonate Rock (CaCO3)

Marble

Recrystallized Calcite Rock (CaCO3)

Tree Agate (also known as Dendritic Agate)

Silicon Dioxide with inclusions (SiO2 + Mn/Fe)

Pink Granite

Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)

Banded Gneiss

Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)

Serpentinite

Serpentinite (complex silicate minerals including Lizardite, Antigorite, and Chrysotile)

Chrysocolla in Matrix

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Silicate/Secondary Copper Mineral)

Rose Quartz

Silicon Dioxide (SiO2)

Turquoise

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

Amethyst Geode

Silicon Dioxide with impurities (SiO2)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Pink Tourmaline (Rubellite)

Elbaite (Tourmaline group) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

Agate (or Chalcedony)

Silicon Dioxide (SiO2)

Mixed Tumbled Stones Collection

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

multiple

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive)

Tumbled Stones (various)

Mixed Silica-based Minerals (primarily Quartz and Chalcedony)

Basalt with Quartz/Feldspar Inclusion

Basalt (containing Silicate minerals such as SiO2 and (Ca,Na)(Al,Si)4O8)