Hematite or Goethite-rich Ironstone
Ironstone (Oxidized Iron Ore)
sedimentary
Category
Organic (Non Rock)
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Milky Quartz Pebble with Matrix
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Quartzite cobblestone
Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphic Quartzite
metamorphic
Quartzite Pebble
Quartzite (Metamorphosed Sandstone)
metamorphic
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions
igneous
Banded Quartzite or Gneissic Pebble
Quartzite with mafic inclusions (SiO2) or Banded Gneiss
metamorphic
Sandstone Flagstone
Quartz Arenite Sandstone
sedimentary
Obsidian
Obsidian (Volcanic Glass, primarily SiO2)
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide, SiO2)
igneous
Petrified Wood / Fossilized Bone
Silicified / Mineralized Fossil (Silica SiO2)
fossil
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Volcanic Glass (Amorphous SiO2-rich glass)
Igneous
Hag Stone
Perforated Flint / Chert Node
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Cobalt Glass Slug (Cullet)
Man-made Silicate Glass with Cobalt Oxide (CoO)
mineraloid
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite or Magnetite inclusions)
igneous
Quartzite Cobble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Limestone
Limestone (Calcium Carbonate - CaCO3)
sedimentary
Tumbled mahogany obsidian
Volcanic glass; primarily SiO₂ with iron-oxide-rich brown inclusions
igneous
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Obsidian Arrowhead
Volcanic Glass (predominantly SiO2)
igneous
Quartzite pebble with Quartz vein
Quartzite (SiO2)
metamorphic
Obsidian
Amorphous volcanic glass (principally SiO2)
igneous
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Obsidian
Volcanic Glass (SiO2)
igneous
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
sedimentary
Chert (Pink variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (River Pebble)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurity)
igneous
Quartzite
Quartzite (high SiO2 content)
metamorphic
Quartzite (River Pebble)
Quartzite, dominated by Silicon Dioxide (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurity)
igneous