Metamorphic Rock

Marble

Recrystallized Calcite (CaCO3)

White Marble

Metamorphosed Limestone (principally CaCO3)

Basalt (River Rock Cobble)

Extrusive mafic volcanic rock (Basalt)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Sapphire (Corundum variety)

Sapphire (Al₂O₃)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Sandstone (Quartzose Sandstone)

Arenite (SiO2 principal component)

Basalt with Quartz/Calcite matrix

Basalt (SiO2 with Ca/Mg/Fe silicates) on a Mineral Matrix

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Ferruginous)

Arenite (SiO2 with iron oxide impurities)

River Pebble (Likely Quartzite or Chalcedony)

Silicon Dioxide (SiO2) - granular metamorphic variety

Marble

Metamorphosed Limestone (mainly CaCO3)

Pink Marble or Rose Quartz (Likely Pink Marble based on carving texture)

Recrystallized Calcite (CaCO3)

Marble

Recrystallized Calcite (CaCO3)

Greenschist

Greenschist (Chlorite Schist)

Basalt

Mafic extrusive igneous rock

Pyrite

Iron Sulfide (FeS2)

Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx')

Calcium Carbonate (CaCO3)

Jadeite and Nephrite (Jade)

Sodium Aluminum Silicate (Jadeite) / Calcium Magnesium Iron Silicate (Nephrite)

Limestone

Calcium Carbonate (CaCO3)

Rhodochrosite

Manganese carbonate (MnCO3)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz (Carved Merkaba)

Silicon Dioxide (SiO2)

Smoky Quartz (Polished)

Silicon Dioxide (SiO2)

Mixed Gemstone Collection

SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)

Green Aventurine

Aventurine Quartz (SiO2 + Fuchsite mica)

Clear Quartz

Silicon Dioxide (SiO2)

Yellow Aventurine

Silicon Dioxide with inclusions (SiO2 + Muscovite/Fuchsite)

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Blue Quartz (Dumortierite Quartz)

Silicon Dioxide with Aluminum Borosilicate (SiO2 + AlAl6BSi3O18)

Citrine

Crystalline Quartz (SiO2) with iron impurities

Aventurine (Green Quartz)

Quartz with Fuchsite inclusions (SiO2 with K(Al,Cr)2(AlSi3O10)(OH)2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Schist

Schist (various compositions)

Marble

Recrystallized Calcite (CaCO3)

White Marble

Recrystallized Calcite (CaCO3)

Schist (Micaceous Schist)

Micaceous schist (Mainly Muscovite/Biotite mixed with Quartz)

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)

Quartz Vein on Matrix

Silicon Dioxide (SiO2)