Pink granite or pink feldspathic rock
Granite, chiefly quartz, potassium feldspar, and plagioclase; exact identification is uncertain from the image
igneous
Category
Non Geological
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Tumbled pink granite or feldspar-rich granitic pebble
Granite, composed mainly of quartz, potassium feldspar, and plagioclase; exact identification is uncertain from the image
igneous
Quartz-rich rock, likely milky quartz vein material
Quartz (SiO₂), possibly iron-stained massive quartz with minor feldspar or mica
mineral
Blue Obsidian
Volcanic Glass (SiO2 with inclusions)
igneous
Rounded dark river pebble, likely basalt
Basalt; fine-grained mafic volcanic rock, typically plagioclase + pyroxene ± olivine
igneous
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Amber
Succinite (Fossilized Tree Resin)
gemstone
Mahogany Obsidian
Volcanic Glass (SiO2 with Fe/Mg oxides)
igneous
Quartzite
Metamorphic Rock (composed mainly of SiO2)
metamorphic
Yellow Quartzite Pebble
Quartzite (SiO2)
metamorphic
Anthracite Coal
Anthracite
metamorphic
Apache Tears (Tumbled Obsidian)
Volcanic Glass (SiO2 + impurities)
igneous
Black Opal
Hydrated Amorphous Silica (SiO2 "n" H2O)
gemstone
Blue Goldstone
Aventurine Glass
man-made glass
Tektite (Indochinite)
Impactite / Tektite (Silica-rich glass)
igneous
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)
metamorphic
Greenstone (possibly Basalt or Greenschist)
Greenschist (composed primarily of chlorite, actinolite, and epidote)
Metamorphic (low-grade)
Snowflake Obsidian
Spherulitic Obsidian (SiO2 + impurities)
igneous
Quartzite Pebble (River Rock)
Quartzite (primarily SiO2)
metamorphic
Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Anthracite Coal
Anthracite (Carbon-based sedimentary-derived metamorphic rock)
metamorphic
Shale
Shale (clay-sized silicate minerals)
sedimentary
Anthracite Coal
Anthracite (Carbon)
metamorphic
Libyan Desert Glass
Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)
mineral (Tektite/Impactite)
Bituminous Coal
Organic sedimentary rock (humic coal)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Amber (Butterscotch/Egg Yolk Variety)
Succinite (Approx. C10H16O)
Organic Gemstone
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Amber
Fossilized Tree Resin
gemstone
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Moldavite
SiO2 (+ Al2O3, FeO, K2O) - Natural Tektite Glass
gemstone
Quartzite
Quartzite (primarily SiO2)
metamorphic
Amber
Succinite (C10H16O)
gemstone
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Cobble
Meta-quartzite
metamorphic
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (primarily SiO2)
igneous
Snowflake Obsidian
Hydrated Volcanic Glass with Cristobalite inclusions
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)
Igneous
Obsidian
Volcanic glass (mainly SiO2 with inclusions)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary