Banded Chert
Silicon Dioxide (SiO2) with impurities
sedimentary
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Rounded granite pebble
Granite, predominantly quartz, feldspar, and mica
igneous
Lichen-covered graywacke or granitic glacial cobble
Indeterminate; likely quartz–feldspar–mica rock, possibly weathered granite or granodiorite
igneous
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Bornite
Bornite (Cu5FeS4)
mineral
Red Jasper (in Quartz/Chalcedony)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartzite cobble
Quartzite (SiO2)
metamorphic
Porphyry
Porphyritic Basalt or Andesite
igneous
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone Pebble
Quartz Sandstone
sedimentary
Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Shale with Iron Staining
Fissile Mudrock (Sedimentary Rock)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Weathered iron-rich sandstone or ironstone cobble
Ferruginous sandstone/ironstone, chiefly quartz (SiO₂) cemented or stained by iron oxides and hydroxides
sedimentary
Likely weathered gray flint/chert pebble
Microcrystalline quartz (SiO₂), commonly with chalcedony and minor impurities
sedimentary
Amethyst (Tumbled Cabinet Stone)
Silicon Dioxide (SiO2) with iron impurities
mineral
Greenstone / altered basalt (likely serpentinite or chlorite-rich rock)
Chlorite–actinolite schist or weakly metamorphosed basalt; exact identification requires testing
metamorphic
Rhyolitic jasper / brecciated jasper
Silica-rich volcanic rock, chiefly microcrystalline quartz (SiO₂), with iron-oxide and clay/mineral impurities
igneous
Biotite (Mica)
Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Puddingstone (Gowganda Tillite/Jasper Conglomerate)
Jasper Conglomerate (SiO2 primary composition)
sedimentary
Granite Cobble (River Stone)
Felsic intrusive igneous rock (composition: Quartz, Feldspar, Mica)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Rutilated quartz bead bracelet
Quartz, silicon dioxide (SiO₂), with rutile inclusions (TiO₂)
mineral
Mahogany Obsidian
Obsidian with Hematite inclusions (SiO2 + Fe2O3)
igneous
Tumbled green aventurine (probable)
Quartz, SiO₂, with fuchsite mica inclusions
mineral
Iron-Stained Quartz Pebble
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Coquina or Coral Fossil
Biogenic Limestone (Calcite/Aragonite)
sedimentary
N/A (Non-Geological Specimen)
N/A
Pyrite (Pseudomorph)
Iron Sulfide (FeS2)
mineral
Nephrite Jade
Nephrite
Mineral/Rock
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Weathered iron-rich sandstone or lateritic rock
Quartz-rich sandstone with iron-oxide/hydroxide cement; possible goethite-bearing laterite
sedimentary
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Citrine
Silicon Dioxide (SiO2)
mineral
Granite River Cobble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Chert (varietal: Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary