Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Category
Man Made Material (Jewelry, Metal Alloy)
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Chert (and/or Flint)
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Gold-bearing quartz vein specimen
Native gold (Au) in quartz (SiO₂), likely with iron-oxide staining
mineral
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Slag (Industrial Byproduct)
Ferrous/Non-ferrous Silicate
igneous (artificial/anthropogenic)
Chert (Chocolate or Brown Flint)
Chert (SiO2)
sedimentary
Diamond in Gold Setting
Diamond (C - pure carbon)
mineral
Blue calcite (likely)
Calcite, calcium carbonate (CaCO₃)
mineral
Granodiorite / Granite (Weathered)
Granodiorite
Igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Yellow/Tan variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert Nodule (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Diamond (in jewelry setting)
Adamantine Carbon (C)
mineral
Mica-rich schist
Muscovite–biotite schist, commonly quartz-bearing
metamorphic
Likely galena-bearing ore specimen
Galena (PbS), possibly with quartz or calcite gangue
mineral
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Silver Nuggets (Natural or Cast)
Native Silver (Ag)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (Siltstone / Flint)
SiO2 (Cryptocrystalline Quartz)
sedimentary
Agate and Chalcedony (Bead Jewelry)
Silicon Dioxide (SiO2)
gemstone
Iron Slag
Ferrous Slag (Industrial Byproduct)
mineraloid (anthropogenic byproduct)
Faceted Glass (Costume Jewelry)
Amorphous Silicon Dioxide with colorants (Glass)
Synthetic/Man-made Material
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Blue Topaz (facetted in jewelry)
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Chert (often called Flint for darker varieties)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Polished red gemstone pendant, likely red jasper or brecciated jasper
Jasper: microcrystalline quartz (SiO₂), commonly with hematite or iron-oxide inclusions
metamorphic
Slag
Anthropogenic Vitreous Silicate / Ferro-silicate Slag
igneous
Iron Meteorite (likely an Individual specimen)
Iron Meteorite (Group IAB, IIAB, IIIAB, etc., Fe-Ni alloy)
igneous
Diamond (in Ring Setting)
Diamond (Pure Carbon, C)
gemstone
Coquina
Bioclastic Limestone
sedimentary
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
mineral
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Likely iron-rich chert or jasper
Microcrystalline quartz (SiO₂), variably stained by iron oxides/hydroxides
sedimentary
Iron Meteorite
Siderite (Iron-Nickel Alloy)
mineral
Coquina
Biogenic Limestone (mostly Calcium Carbonate, CaCO3)
sedimentary
Copper Ore (likely Malachite or Chrysocolla staining)
Copper Secondary Mineral (e.g., Cu2CO3(OH)2)
mineral