Metamorphic Mineral

Slate

Slate (Metamorphic Rock)

Quartzite Cobble

Metamorphic Quartzite (SiO2)

Quartzite

Metamorphic Quartz (SiO2)

Slate

Foliated metamorphic rock

Jasper in Rhyolite matrix

Silicon Dioxide (SiO2) with various inclusions in Felsic Igneous matrix

Blue Aventurine

Silicon Dioxide (SiO2) with inclusions of Dumortierite

Amethyst and Ruby in Zoisite

Silicon Dioxide (SiO2) and Anyolite (Zoisite-Hornblende-Ruby mix)

Nephrite (a form of Jade)

Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Pyrite (or Fool's Gold)

Pyrite (FeS₂)

Serpentine

Serpentine Group Minerals (e.g., Antigorite, Chrysotile, Lizardite)

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2)

Black Tourmaline (Schorl)

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

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Calcite

Calcite (CaCO3)

Red Jasper (Brecchiated Jasper)

Silicon Dioxide (SiO2) with Hematite impurities

Calcite

Calcite (Mineral, Calcium Carbonate - CaCO3)

Lapis Lazuli

Lapis lazuli (primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Prehnite

Prehnite, Ca2Al2Si3O10(OH)2

Serpentine

Serpentinite (composed mainly of Group Minerals Antigorite, Chrysotile, and Lizardite; Mg3Si2O5(OH)4)

Black Tourmaline

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

Bronzite

MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amethyst (Geode Fragment)

Silicon Dioxide (SiO2 with iron impurities)

Serpentine

Serpentinite (group of minerals including Antigorite, Lizardite, or Chrysotile) (Mg, Fe)3Si2O5(OH)4

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Green Aventurine

Aventurine (a variety of Quartz, SiO2 with fuchsite inclusions)

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Serpentine

Serpentinite (rock) containing serpentine minerals (e.g., Antigorite, Lizardite, Chrysotile)

Zoisite with Ruby

Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)

Slate with Red Sandstone Landscaping Rock

Foliated Pelitic Metamorphic Rock (Slate) and Ferruginous Sandstone

Lapis Lazuli

Lapis Lazuli (a rock type, not a single mineral; main component is Lazurite (Na,Ca)8[(S,Cl,SO4,OH)2|(Al6Si6O24)])

Serpentinite

Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)

Garnet (Red Garnet)

Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

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.

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Quartz

Silicon dioxide (SiO2)

Veined Pebble (likely a Quartz-Veined Pebble)

Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)