Pink Granite
Granite (Phaneritic igneous rock)
igneous
Category
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Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Chert Nodule / Ironstone Concretion
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Granite
Granite (felsic intrusive igneous rock)
igneous
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
Sedimentary
Granite
Plutonic Granite
igneous
Granite
Granite
Igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Polished blue banded agate cabochon/ornamental slab
Microcrystalline quartz (chalcedony), SiO₂, with blue coloring or inclusions
mineral
Smoky Quartz (with possible Garnet inclusions)
Silicon Dioxide (SiO2)
mineral
Granite Pebble (Pink Feldspar-rich)
Granite
igneous
Mixed river-worn rock and mineral collection
Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble
igneous, sedimentary, metamorphic, mineral
Coquina and Oyster Fossil Rock
Coquina limestone (Calcium Carbonate, CaCO3) containing fossilized Crassostrea / bivalve shells
fossil
Flint
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Collection of Minerals and Ores
Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone Pebble
Sandstone (Siliciclastic Sedimentary Rock)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities
mineral
Quartz Sandstone
Quartz Arenite
sedimentary
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Likely weathered metallic mineral or slag fragment
Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite River Stone
Phaneritic Felsic Igneous Rock
igneous
Pink Granite
Granite (Felsic Plutonic Rock)
igneous
Granite (Leucogranite)
Felsic Plutonic Rock (Granite)
igneous
Granite
Granite (Silicic Plutonic Rock)
igneous
Turquoise (Dyed Howlite/Magnesite)
CuAl6(PO4)4(OH)8·4H2O (Natural Turquoise) or Ca2B5SiO9(OH)5 (Howlite)
mineral
Kimberlite
Kimberlite (Potassic ultramafic volcanic rock)
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Shale
Shale (Argillaceous sedimentary rock)
sedimentary
Rhinestone (or glass crystal)
Silicon dioxide (if glass) / Various
Mineral/gemstone imitation
Sandstone
Arenite (SiO2 with minor iron oxides)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-oxide enriched)
sedimentary
Hagstone (Adder Stone)
Chert or Sedimentary pebble with natural perforation
sedimentary
Citrine (Heat-treated Amethyst)
Citrine Quartz (SiO2)
Mineral (Tectosilicate)
Agate with Fossil/Inclusion
Silicon Dioxide (SiO2) with chalcedony and potential fossil inclusion
sedimentary
Fossilized Shark Tooth
Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)
sedimentary