Ruby / Pink Sapphire
Corundum (Al2O3 with Chromium impurities)
gemstone
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Schist
Mica Schist
metamorphic
Possible iron-rich pebble with a weathered inclusion
Unidentified; image alone does not support a reliable mineral or rock identification
igneous
Sandstone
Arenite
sedimentary
Pegmatite
Pegmatite (coarse-grained intrusive igneous rock)
igneous
Weathered quartz-rich rock fragment
Indeterminate; likely quartz-bearing granitoid or quartzite
mineral
Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Star sapphire ring
Corundum (Al₂O₃), likely asteriated sapphire
gemstone
Clam shell (likely a bivalve shell)
Bivalvia; shell composed primarily of calcium carbonate (usually aragonite and/or calcite)
fossil
Likely beach-worn glass and a pebble
The brown piece appears to be weathered glass (amorphous SiO₂-rich material); the pale piece is likely a small quartz-rich stone, possibly milky quartz.
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Chert (Quartz Pebble)
Silicon Dioxide (SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Black Kyanite
Aluminum Silicate (Al2SiO5)
mineral
Greenish metamorphic rock (possibly chlorite schist)
Chlorite-rich schist; exact identification is uncertain from the image
metamorphic
Sandstone
Sandstone (clastic sedimentary rock)
Rock
Polished botryoidal jasper/chalcedony (likely ocean jasper)
Microcrystalline quartz, SiO₂, with iron-oxide and other mineral inclusions
mineral
Quartzite Arrowhead (Archaeological Lithic)
Recrystallized Quartz (SiO2)
metamorphic
Diamond
Carbon (C)
gemstone
Small quartz-rich rock fragment
Unidentified quartz-bearing rock; the image is insufficient for a precise identification
igneous
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert (Jasper variety)
Microcrystalline quartz (SiO2)
sedimentary
Sandstone
Arenite (primary component SiO2)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Iron-rich meteorite candidate
Unclassified meteoritic iron–stone material; possible stony-iron meteorite or terrestrial ironstone
meteorite
Vesicular Basalt
Extrusive Mafic Igneous Rock (Vesicular Basalt)
igneous
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Limestone and Quartz Gravel with Petrified Wood
Sedimentary gravel aggregate and fossilized wood
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Likely weathered metallic mineral or slag fragment
Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag
mineral
Granitic Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)
Igneous
Sandstone
Arenite
sedimentary
Fossilized belemnite rostrum (likely)
Belemnitida, a fossil cephalopod guard; exact genus cannot be determined from the image
fossil
Tiffany Stone
Fluoritized Opal Beryllium Tuff (composed of Fluorite; CaF2, Opalized SiO2, Bertrandite, Chalcedony, and Quartz)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Weathered stone nodule or concretion
Unidentified lithic concretion; composition cannot be determined from the image
sedimentary
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Quartz-veined weathered host rock
Quartz (SiO₂) in a likely altered limestone or metamorphic carbonate host
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic