Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Category
Not A Geological Specimen
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Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Cubic Zirconia (Set in Jewelry)
Zirconium Dioxide (ZrO2)
gemstone
Diamond (Cluster Ring)
Carbon (C)
mineral
Cubic Zirconia (Diamond Simulant)
Zirconium Dioxide (ZrO2)
mineral
Diamond (in a jewelry setting)
Carbon (C)
mineral
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Diamond (in a metal ring setting)
Diamond (Pure Carbon, C)
mineral
Diamond
Carbon (C)
gemstone
Diamond
Diamond (Pure Carbon, C)
mineral
Diamond (in a jewelry setting)
Carbon (C)
mineral
Diamond
Diamond (C)
mineral
Quartz Geode
Quartz (Silicon Dioxide, SiO2) Geode
sedimentary
Quartz (Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained or Rose variant)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Banded Agate Geode
Silicon Dioxide (SiO2)
mineral
Favosite Fossil (Calyx or Rugose Coral)
Favosites (Extinct Tabulate Coral)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt containing Zeolite and Calcite inclusions
igneous
Gold in Quartz Matrix
Native Gold (Au) in Quartz (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Basalt
Basalt
Igneous
Fluorite (translucent octahedral crystal)
Calcium fluoride (CaF2)
mineral
Yellow Quartzite River Stone
Quartzite (SiO2)
metamorphic
Bull Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Smoky Quartz (with Druzy/Polished Edge)
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Chalky Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Tumbled Obsidian (possibly Mahogany Obsidian variant)
Volcanic Glass (Amorphous Silicon Dioxide, SiO2)
igneous
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sunstone
Plagioclase Feldspar (containing (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions)
mineral
Jasper with Agate and Quartz Inclusions
Silicon Dioxide (SiO2) - Chalcedony / Quartz aggregate
sedimentary
Ferruginous Quartzite (Red Sandstone/Quartzite)
Quartzite with Iron inclusions (SiO2 + Fe2O3)
metamorphic
Chert (Smooth River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Zoisite with Ruby (Anyolite)
Anyolite (Calcium aluminium silicate hydroxide with Corundum)
metamorphic
Limonite (Yellow Ochre)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)
Chalcedony (Agate)
Chalcedony (Cryptocrystalline Quartz, SiO2)
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral