Metamorphic And Igneous

Blue Sapphire

Corundum (Al2O3) with traces of Iron and Titanium

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with Iron Oxide impurities

Calcite

Calcite (CaCO3)

Emerald in Matrix

Emerald (Beryllium Aluminum Silicate), Be3Al2(SiO3)6

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

Red gemstone ring, likely garnet or synthetic ruby

Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Milky quartz (iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Red Quartz

Silicon Dioxide (SiO2) with Hematite inclusions

White quartz-rich pebble

Likely quartzite or milky-quartz pebble (SiO₂)

Milky quartz

Quartz (SiO₂), likely massive milky quartz with minor iron-oxide staining and inclusions

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Quartz crystal with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Quartz Pebble

Silicon Dioxide (SiO2)

Blue cabochon gemstone ring

Uncertain; likely blue sapphire (corundum, Al₂O₃), blue topaz, or synthetic glass/spinel

Bull Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky quartz vein fragment

Quartz, silicon dioxide (SiO₂)

Faceted yellow gemstone, likely citrine

Citrine (quartz), SiO₂; possibly yellow sapphire or synthetic glass without testing

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3:Cr)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix

Blue Sapphire and Diamond (Set in Metal)

Corundum (Al2O3) and Diamond (C)

Green Calcite

Calcite (CaCO3)

Rose Quartz

Rose Quartz (SiO2)

Quartz River Pebble with Algae

Silicon Dioxide (SiO2) with organic biofilm

Granite Gneiss or Granitoid River Rock

Granitoid / Gneiss

Quartzite (river pebble) and Gabbro (crushed rock)

Quartzite (metamorphosed Quartz Sandstone, SiO2) and Gabbro (Plagioclase-Clinopyroxene rock)

Riverstone (Quartzite/Granite Cobble)

Silicon Dioxide (SiO2) based Quartzite or Silicate-rich Granite

Sapphire (Corundum variety)

Sapphire (Al₂O₃)

Gold (Processed)

Gold (Au)

Calcite

Calcite (CaCO3)

Greenish rock with white veins, possibly epidote or chlorite bearing rock with quartz/calcite veins

Altered mafic rock or Epidosite

Rutilated Quartz

SiO2 with TiO2 inclusions (Rutile)

Fulonite (Fulgurite-like)

Fulgurite (SiO2 fused silica/lechatelierite)

Quartz Vein in Host Rock (often Granite or Schist)

Silicon Dioxide (SiO2) within host matrix

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)