Metamorphic Or Igneous

Granodiorite (Gneissic Pebble)

Granodiorite displaying minor foliation

Quartz Vein in Host Rock (Gabbro or Basalt)

Silicon Dioxide (SiO2) with Mafic Silicates

Glacial Cobbles (predominantly Granite and Gneiss)

Mixed lithologies (Quartz, Feldspar, Mica assemblage)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Matrix

River Stone (possibly Gneiss)

Metamorphic Gneiss

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Quartz (Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Aquamarine

Beryl (Be3Al2Si6O18)

Smoky Quartz

Quartz (SiO₂)

Pyrite (or Fool's Gold)

Pyrite (FeS₂)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Quartz (vein quartz)

SiO2 (Silicon Dioxide)

Quartz

Silicon Dioxide (SiO2)

Blue Dumortierite Quartz

Dumortierite Inclusions in Quartz (SiO2 with Al7(BO3)(SiO4)3O3)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Almandine Garnet in Schist

Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist

Schist

Schist

General river rock or weathered cobble

Mixed rock composition

Quartz with Mica (Micaceous Quartz)

Silicon Dioxide (SiO2) with Phyllosilicates

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Yellow Aventurine (Yellow Quartz)

Silicon Dioxide (SiO2) with inclusions of Muscovite or Mica

Ruby in Zoisite

Anyolite (Zoisite with Corundum) Member of the Epidote Group

Green Quartz (Aventurine)

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Granite

Granite (a felsic intrusive igneous rock)

Quartz with Mica/Chlorite inclusions

Silicon Dioxide (SiO2) with phyllosilicate inclusions

Granite

Granite

Quartz

Silicon Dioxide (SiO2)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Rose Quartz

Quartz (SiO2) with trace elements of titanium, iron, or manganese

Peridot and Citrine Gemstones (in a ring setting)

Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)

Sapphirine in Magnesian Schist

Sapphirine: (Mg,Al)8(Al,Si)6O20

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.

Rose Quartz

Rose Quartz (SiO₂)

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)

Calcite

Green Aventurine

Aventurine (a variety of Quartz, SiO2)

Quartz (possibly milky quartz or quartz with inclusions)

SiO2 (Silicon Dioxide)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Rhodonite in Matrix

Rhodonite (Manganese Silicate) - (Mn2+,Fe2+,Mg,Ca)SiO3

Green Aventurine

Aventurine Quartz (SiO2 with fuchsite inclusions)

Mica (specimen appears to be Muscovite or Phlogopite)

Phyllosilicate mineral; Muscovite: KAl2(AlSi3O10)(F,OH)2

Quartz

Quartz (SiO2 - Silicon Dioxide)