Siltstone Pebble
Siltstone (fine-grained siliciclastic sedimentary rock)
sedimentary
Category
Non Geological
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Amber
Succinite (a specific high-quality amber from the Baltic)
Organic Mineraloid
Quartzite
Quartzite (SiO2)
metamorphic
Blue Glass or Slag Glass
Amorphous Silica (Anthropogenic Glass)
mineral
Soapstone
Steatite (Hydrated magnesium silicate)
metamorphic
Corundum (Sapphire variant)
Aluminium oxide (Al2O3)
mineral
Rough Ruby
Corundum (Al2O3) with Chromium traces
mineral
Slag (Industrial Glass/Glassy Rock)
Anthropogenic Vitreous Material
igneous
Gneiss
Gneiss
metamorphic
Titanium Aura Quartz (Bismuth-coated Druzy)
Silicon Dioxide (SiO2) with Titanium/Metal vapor coating
mineral
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Mineral
Green Sea Glass
Man-made vitreous material (silica glass)
gemstone
Quartzite Pebble
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Tumbled mahogany obsidian
Volcanic glass; primarily SiO₂ with iron-oxide-rich brown inclusions
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Amber
Fossilized tree resin (C10H16O)
gemstone
Quartzite Pebble
Quartzite (Metamorphosed Sandstone)
metamorphic
Quartzite
Metamorphic Quartzite
metamorphic
Quartzite pebble with Quartz vein
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartz-rich Rock
metamorphic
Milky Quartz Pebble with Matrix
Silicon Dioxide (SiO2)
mineral
Amber (Raw Copal)
Fossilized Plant Resin (Gummite/Succinite)
mineral
Coal
Carbonaceous sedimentary rock
sedimentary
Opalite
Synthetic Glass (Silica-based)
gemstone
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Green Aventurine
Quartzite (Silicon Dioxide, SiO2 + Fuchsite)
metamorphic
Yellow Quartzite River Stone
Quartzite (SiO2)
metamorphic
Quartzite (River Cobble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Blue Quartzite
Quartzite (primarily SiO2 with inclusions)
metamorphic
Obsidian
Volcanic Glass (SiO2)
igneous
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Apache Tear
Obsidian (Hydrated Silica / Amorphous Volcanic Glass)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Common Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineraloid
Eclogite
Eclogite (Omphacite-Garnet Rock)
metamorphic
Quartzite Beach Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Amber / Fossilized Resin
Succinite / Fossilized Tree Resin
mineral
Chert River Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Vesicular volcanic rock, likely pumice or scoriaceous rhyolite
Vesicular rhyolite/dacite; predominantly silica-rich volcanic glass with feldspar and quartz
igneous