Weathered quartz-rich pebble (probable quartzite or quartz vein fragment)
Quartzite, predominantly silicon dioxide (SiO₂); exact identification is uncertain from the photograph
metamorphic
Category
Synthetic (Man Made Glass)
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Milky quartz (likely quartz-rich rock)
Quartz, silicon dioxide (SiO₂)
mineral
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Limestone
Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Polished black stone pendant, likely obsidian
Volcanic glass; primarily silica-rich rhyolitic glass (SiO₂), if obsidian
igneous
Possible tektite or volcanic glass specimen
Natural silica glass; composition commonly near SiO₂, but exact identification requires chemical testing
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
K-Feldspar (Potassium Feldspar / Pink Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO₂)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz (Milky Quartz / Quartz Crystal)
Silicon Dioxide (SiO2)
mineral
Tumbled Agate and Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace Titanium, Manganese, or Iron
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Greasy Quartz (likely carved Milky Quartz or Aventurine)
Silicon Dioxide (SiO2)
mineral
Obsidian (Apache Tear)
Obsidian / Amorphous Volcanic Glass (main component: SiO2)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Snowflake Obsidian
Hydrated Volcanic Glass (primarily SiO2) with Cristobalite inclusions
igneous
Gray Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Faceted Quartz (Rock Crystal)
Crystalline Silicon Dioxide (SiO2)
gemstone
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (70-75% SiO2)
igneous
Fulgurite
Liesegang (Fulgurite)
Mineraloid
Sea Glass (often mistaken for Gemstones)
Amorphous Silica (SiO2) with trace additives
mineraloid
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz-rich rock, possibly milky quartz or quartzite
Quartz (SiO₂), potentially quartzite if the grains are fused
mineral
Yellow Quartzite
Quartzite (SiO2)
metamorphic