Sunstone
Heliolite (Sodium Calcium Aluminum Silicate with Iron or Copper inclusions)
mineral
Category
Not A Geological Specimen
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Carnelian Agate
Carnelian (Silicon Dioxide: SiO2) with iron oxide impurities
mineral
Sapphire (Corundum variety)
Sapphire (Al₂O₃)
Mineral
Chert (Green variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amethyst
Silicon dioxide (SiO2) containing traces of iron and manganese
mineral
Acicular Azurite (indicated by deep blue, fibrous/fuzzy appearance)
Azurite (Copper Carbonate Hydroxide) - Cu3(CO3)2(OH)2
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
sedimentary
Chert (specifically Yellow Jasper variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Jasper with Hematite inclusions
Silicon Dioxide (SiO2) with Fe2O3
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Vein Rock
Silicon Dioxide (SiO2)
Mineral
Pyrite
Pyrite (FeS2)
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pink Granite (Gneissic Granite)
Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)
igneous
Granite Pebble (Pink Granite)
Phaneritic Igneous Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Geode (Unopened)
Siliceous Septarian Concretion / Geode (SiO2)
sedimentary
Chert (Quartz var.)
Silicon Dioxide (SiO2)
sedimentary
Gold
Native Gold (Au)
mineral
Labradorite
Labradorite (Ca,Na)(Al,Si)4O8
mineral
Sandstone (Red Flagstone)
Clastic sedimentary rock (primarily Quartz - SiO2)
sedimentary
Honey Calcite (Yellow Calcite)
Calcium Carbonate (CaCO3)
mineral
Moss Agate
SiO2 with impurities (Chalcedony)
Mineral/Gemstone
Brown Jasper
Jasper (a cryptocrystalline variety of Quartz, SiO2)
Mineral, specifically a variety of Quartz
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Granite (Dioritic or Hornblende-rich)
Phaneritic Plutonic Felsic to Intermediate Igneous Rock
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone with trace fossil
Sandstone, possibly with Skolithos or similar trace fossil
sedimentary
Chalcopyrite
Chalcopyrite (CuFeS2)
mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Garnet (Almandine variety)
Almandine, Fe3Al2(SiO4)3
Mineral
Crushed Limestone
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Clear Quartz (Herkimer Diamond variant)
Silicon Dioxide (SiO2)
mineral
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral