Quartzite Pebble
Quartzite (principally SiO2)
metamorphic
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Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite Pebbler
Quartzite (SiO2)
metamorphic
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
River Cobble (Quartzite)
Meta-orthoquartzite
metamorphic
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Copper Ore
Native Copper (Cu) often found with Chalcocite (Cu2S) or Bornite (Cu5FeS4)
mineral
Amber
Succinite (Formula: C10H16O)
Organic Mineraloid
Limestone with Fossil Inclusion
Calcium Carbonate (CaCO3)
sedimentary
Amethyst
Quartz (Silicon Dioxide with iron impurities) - SiO2
mineral
Cubic Zirconia (in Jewelry)
Zirconium Dioxide (ZrO2)
mineral
Yellow Jasper
Opaque Cryptocrystalline Quartz (SiO2)
sedimentary
Granite
Granite (composed mainly of Quartz, Feldspar, and Mica)
igneous
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Oak Wood (Wood Grain Pattern)
Quercus (genus)
Organic (Non-rock)
Obsidian
Volcanic Glass (predominantly SiO2 – Silicon Dioxide, but non-crystalline)
Igneous
Rose Quartz
Rose Quartz (SiO2)
Mineral
Green Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Snowflake Obsidian
Obsidian with Cristobalite inclusions (mostly amorphous SiO2)
igneous
Black Obsidian
Volcanic Glass (SiO2)
igneous
Coal
Bituminous or Anthracite Coal
sedimentary
Obsidian (Apache Tear)
Volcanic Glass (High-silica Rhyolite)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2-rich metamorphic rock)
metamorphic
Obsidian
Volcanic Glass (SiO2)
igneous
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Quartzite Cobble
Metamorphic Quartzite (SiO2)
metamorphic
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Amber
Succinite
mineraloid
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Amber (Rough)
Amber (Fossilized Tree Resin, succinite)
mineral
Obsidian
Volcanic glass (SiO2 - Silicon dioxide predominant composition)
Igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Quartzite
Quartzite (mostly SiO2)
metamorphic
Amber
Succinicum (Formula: C10H16O)
Mineraloid