Likely vertebra fossil or bone fragment
Indeterminate fossilized vertebra; mineralized hydroxyapatite, commonly Ca₅(PO₄)₃(OH)
fossil
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Druzy Chalcedony (Agate Geode)
Silica (SiO2) - Cryptocrystalline Quartz with druzy macrocrystalline quartz
mineral
Druzy Quartz Geode (with Chalcedony)
Silicon Dioxide (SiO2)
mineral
Sandstone (Pebble)
Sandstone
sedimentary
Banded Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Diamond
Diamond (pure carbon, C)
mineral
Chert (Banded)
Cryptocrystalline Silica (SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite
sedimentary
Small polished dark mineral or gemstone fragment
Indeterminate; possibly smoky quartz, obsidian, or dark tourmaline
mineral
Rough Diamond
Diamond (Native Carbon), C
mineral
Sandstone
Arenite (SiO2 with various cementing agents)
sedimentary
Sandstone (with Calcite or Silica veins)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Jasper and Chalcedony Nodule
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Quartz pebble (Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Tumbled dark gray stone, likely basalt
Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine
igneous
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Mica Schist
Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Conglomerate
Sedimentary Conglomerate with Basaltic Clast
sedimentary
Slate
Metamorphic pelitic rock
metamorphic
Sandstone
Arenite
sedimentary
Scoria (vesicular basalt)
Scoria; vesicular mafic volcanic rock, commonly basaltic in composition
igneous
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Sand Tiger Shark Tooth (Fossil)
Carcharias taurus (fossilized dentin/enameloid)
fossil
Slag Glass (Cullet)
Amorphous Silica (man-made), primarily SiO2 with trace metal oxides
Mineraloid / Synthetic Glass
Iron-rich sandstone or lateritic rock
Ferruginous sandstone; predominantly quartz (SiO₂) cemented or stained by iron oxides/hydroxides
sedimentary
Heart-shaped Quartz
Silicon Dioxide (SiO2)
mineral
Granite Cobble/Pebble
Granite
Igneous
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Quartz Veined Quartzite or Sandstone
Quartzite with Quartz Veins (SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (Phaneritic Igneous Rock)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary