Gold
Native Gold (Au)
mineral
Category
None
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Gold Grain
Native Gold (Au)
mineral
Druzy Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Citrine
Silicon Dioxide (SiO2)
mineral
River Pebble (likely Quartzite or Siltstone)
Sedimentary Clast (SiO2 based)
sedimentary
Sandstone (with secondary weathering/concretion)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Yellow Jasper
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Gravel)
Microcrystalline silica (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Citrine
Silicon Dioxide (SiO2)
mineral
Chert (Arrowhead Preform or Point)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Quartz Geode (Water-worn)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Chert / Flint Nodule
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Smoky Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Amethyst (Polished Cabochon)
Silicon Dioxide (SiO2) with iron impurities
mineral
Gold Nugget
Native Gold (Au)
mineral
Pearl (Imitation or Cultured)
Calcium Carbonate (Aragonite/Calcite) - CaCO3
Mineraloid (Organic)
Quartzite
Quartzite (primarily SiO2)
Metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Anthracite Coal
Anthracite (Highly Metamorphosed Coal)
sedimentary
Quartzite with inclusions
Quartzite (SiO2)
metamorphic
Quartzite Cobble
Quartzite (SiO2 based metamorphic rock)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary
Quartzite pebble
Quartzite (SiO2)
metamorphic
Green Quartzite
Quartzite (SiO2 with inclusions)
metamorphic
Obsidian
Volcanic Glass (mostly SiO2)
igneous
Quartzite Pebble
Metamorphic Quartzite (primarily SiO2)
metamorphic
Black Obsidian
Volcanic Glass (SiO2)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Orange Quartzite (River Pebble)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Obsidian
Obsidian (Amorphous Volcanic Glass, SiO2)
igneous
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous