Limestone Cobble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Category
Not A Geological Specimen
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Gneiss
Metamorphic rock of high-grade regional metamorphism
metamorphic
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Quartz (Iron-Stained Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Human Skin (Epidermis/Dermis)
Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)
Mineral-like biological tissue
Chert (and Jasper blend)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Red Jasper (possibly Agatized Jasper)
Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)
sedimentary
Jasper and Quartzite mix
Silicon Dioxide (SiO2) with impurities
sedimentary or metamorphic
Basalt (Road Aggregate)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Antropogenic (Man-made industrial byproduct)
Sandstone Pebble (Quartzite-rich)
Clastic Terrigenous Sedimentary Rock (SiO2 dominant)
sedimentary
Green Calcite
Calcite (CaCO3)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Pink Calcite (Mangano Calcite)
Calcium Carbonate (CaCO3)
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Gneiss
Gneiss
metamorphic
Carnelian (Carnelian Agate)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Glauconitic Sandstone (Greensand pebble)
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Milky Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Banded Iron Formation (Jaspillite)
Banded Iron Formation (BIF) / Jaspillite
sedimentary
Green Jasper (with Quartz veining)
Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2
sedimentary
Optical Calcite (Iceland Spar)
Calcium Carbonate (CaCO3)
mineral
Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone or Limonite (FeO(OH)·nH2O)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Yellow Agate
Agate (Microcrystalline Silicon Dioxide, SiO2)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Sandstone (specifically an Iron-Concretion)
Arenite with Iron Oxide (Limonite/Goethite) cementation
sedimentary
Iron Gossan (Limonite/Goethite)
Hydrated Iron Oxides (FeO(OH)·nH2O) from oxidation zones
sedimentary
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Mineraloid
Quartz with Iron Oxide Inclusions
SiO2 with Fe2O3 impurities
Mineral
Jasper (specifically a banded or dark variety)
Silicon Dioxide (SiO2) with impurities
sedimentary
Pyrite in Matrix (Commonly called Fool's Gold)
Iron Sulfide (FeS2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Chert (or Flint)
SiO2 (predominantly microcrystalline quartz)
Sedimentary