Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Category
Man Made Rock (Technosol)
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Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Red)
Arenite (composed primarily of SiO2)
sedimentary
Jasper (Yellow Jasper)
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Snowflake Obsidian
Obsidian with Cristobalite inclusions
igneous
River Rock (Greywacke/Siltstone)
Siltstone / Argillaceous Greywacke
sedimentary
Citrine
Silicon Dioxide (SiO2)
mineral
River Stone (Greywacke)
Greywacke (Lithic Sandstone)
sedimentary
Sandstone (Quartzite texture)
Arenite (SiO2 secondary)
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Jasper (Iron-rich)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities
sedimentary
Siltstone Pebble
Siltstone (fine-grained siliciclastic sedimentary rock)
sedimentary
Quartzite pebble
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Weathered iron-rich basalt or volcanic breccia
Mafic volcanic rock, likely basalt; composition dominated by plagioclase and pyroxene with iron oxides
igneous
Likely weathered sandstone or iron-stained quartzite fragment
Quartz-rich sandstone (predominantly SiO₂; exact identification uncertain from image)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sea Shell (Mollusk Shell)
Calcium Carbonate (Aragonite/Calcite)
fossil
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Orange/Pink variety)
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Purple Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Fossil Bivalve Shell
Class Bivalvia (e.g., Veneriidae family)
sedimentary
Pyrite in Matrix
Iron Disulfide (FeS2)
mineral
Granite (with Quartz fragment)
Intrusive Felsic Igneous Rock
igneous
Quartzite
Metamorphic rock (SiO2)
metamorphic
Granite
Plutonic Igneous Rock
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt Fragment
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous