Limestone Cobble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Category
Man Made Material (Metal)
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Granite Pebble
Granite (Felsic intrusive igneous rock)
igneous
Granite Pebble
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite Pebble
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock consisting of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite Pebble
Granite; primarily composed of Quartz (SiO2), Feldspar (KAlSi3O8), and Mica
igneous
Fossil shell fragment
Indeterminate molluscan bioclast, likely aragonite or calcite
fossil
Yellow chalcedony (likely heat-treated or resin-coated)
Microcrystalline quartz, SiO₂
mineral
Quartzite
Quartzite (primarily composed of SiO O₂)
Sedimentary Rock
Aquamarine
Beryl (Be3Al2Si6O18), specifically the blue-green variety
Mineral
Diamond (or Diamond Simulant)
Carbon (C)
gemstone
Diamond
Native Carbon (C)
gemstone
Fossilized Shark Tooth (Anterior/Lateral)
Otodus megalodon or Carcharodon carcharias (fossilized)
fossil
Diamond
Carbon (C)
gemstone
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Diamond (Cut Gemstone)
Carbon (C)
gemstone
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Boulder Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Limonite (Ironstone)
Limonite (mixture of hydrated iron(III) oxide-hydroxides)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Limestone (River Pebble)
Calcite (Calcium Carbonate) - CaCO3
sedimentary
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Porphyritic granite or granodiorite
Coarse-grained plutonic rock composed mainly of quartz (SiO₂), feldspar, and mica/amphibole
igneous
Tumbled chalcedony (likely brown agate/jasper)
Microcrystalline quartz, SiO₂; potentially iron-stained chalcedony or jasper
mineral
Quartz-rich rock, possibly milky quartz or quartzite
Quartz (SiO₂), potentially quartzite if the grains are fused
mineral
Iron-rich chert or jasper
Microcrystalline quartz (SiO₂), colored by hematite/goethite inclusions
sedimentary
Petrified Rugose Coral (Horn Coral)
Order Rugosa (extinct coral)
sedimentary
Flint
Microcrystalline quartz (SiO2)
sedimentary
Riverstone (Siltstone/Mudstone)
Siltstone
sedimentary
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Tumbled green aventurine
Quartz variety, mainly SiO₂ with fuchsite or other mica inclusions
mineral
Tumbled green aventurine (probable)
Quartz, SiO₂, with fuchsite mica inclusions
mineral
Wishing Stone (Basalt or Chert with Quartz Veins)
Basalt or microcrystalline Quartz (Chert) with localized hydrothermal Quartz (SiO2) veining
igneous or sedimentary
Chert (with Limestone/Dolomite host)
Microcrystalline Quartz (SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Scoria (Volcanic Rock)
Scoria (often basaltic scoria)
Igneous
Tumbled jasper or brecciated jasper
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and dark mineral inclusions
mineral
Red jasper (likely brecciated jasper)
Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides
mineral
Polished blue agate/geode slice
Chalcedony (microcrystalline quartz, SiO₂), likely dyed blue
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral