Yellow Jasper
Silicon Dioxide with iron inclusions (SiO2)
sedimentary
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Honey calcite (likely rough cleavage fragment)
Calcite, calcium carbonate (CaCO₃)
mineral
Quartz Veined Basalt
Mafic Igneous Rock with Quartz (SiO2) intrusion
igneous
Red Sandstone Pebble
SiO2 with Fe2O3 (Quartz sandstone with hematite coating)
sedimentary
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Granite (specifically Pink Granite)
Phaneritic Plutonic Rock (High Potassium Feldspar Granite)
igneous
Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) within a resin matrix
igneous
Chert (White Variety)
Silicon Dioxide (SiO2)
sedimentary
Lapis Lazuli
Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
Metamorphic rock
Graphite-veined Quartzite
Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)
metamorphic
Iron Slag
Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)
Anthropogenic (Man-made industrial byproduct)
Quartzite Pebbler
Quartzite (SiO2)
metamorphic
Tumbled blue-gray stone, likely quartzite or fine-grained basalt
Provisional identification: quartzite (mostly quartz, SiO₂) or basalt (plagioclase–pyroxene); image alone cannot distinguish reliably
igneous
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper aluminum phosphate)
gemstone
Red Granite
Phaneritic Felsic Igneous Rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Calcite (likely chalky calcite fragment)
Calcite, calcium carbonate (CaCO₃)
mineral
Weathered brown stone, possibly basalt or iron-rich sedimentary rock
Indeterminate from photograph; likely fine-grained mafic rock (basalt) or ferruginous sandstone
igneous
River Rock (Sandstone or Quartzite)
Clastic Sedimentary Rock / Quartzite
sedimentary
Quartz with Iron Oxide Staining (Citrine-like Quartz)
Silicon Dioxide (SiO2)
mineral
Tumbled jasper (likely brecciated or orbicular jasper)
Microcrystalline quartz (SiO₂), with iron-oxide inclusions
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Fossilized Shark Tooth (Eroded)
Carcharodon sp. or Otodus sp. fragment (likely)
fossil
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Chert (or Flint)
Chert (a cryptocrystalline variety of quartz, SiO2)
sedimentary
Tumbled brown chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Tumbled dark pebble
Indeterminate; likely basalt or fine-grained dark metamorphic rock
mineral
Rounded iron-rich pebble
Likely hematite/goethite-bearing quartzite or ironstone; exact identification requires testing
mineral
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Tumbled brown chalcedony (likely jasper or agate)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining
mineral
Sandstone
Sandstone (SiO2-rich clastic sedimentary rock)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO₂ / Silicon Dioxide)
mineral
Likely weathered brown rock or iron-rich mineral specimen
Indeterminate from image; possible limonite/goethite-rich material
mineral
River-worn Chert
Microcrystalline Quartz (SiO2)
sedimentary
Fossil-bearing sedimentary rock, possibly fossil wood or bone
Indeterminate silicified/carbonate fossil in sandstone or mudstone
fossil
Diamond
Native Carbon (C)
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Desert Rose (Gypsum)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral