Quartzite Pebble
Quartzite (Silicon Dioxide: SiO2)
metamorphic
Category
Industrial Byproduct
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Quartzite Cobble
Quartzite (mostly SiO2)
metamorphic
Rough Quartz (var. Citrine or Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Fossilized Shark Tooth
Carcharodon (Galeocerdo sp. or Lamniform)
mineral
Quartz-encrusted Matrix
Silicon Dioxide (SiO2) with Ferruginous Sandstone
sedimentary
Desert Rose (Gypsum Variety)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Granite Pegmatite
Coarse-grained Granite (SiO2 - Aluminum and Alkalies)
igneous
White Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Synthetic / Manufactured Artifact
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Quartz Sand
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Concrete rubble
Anthropogenic conglomerate
sedimentary
Synthetic Resin / Plastic Figurine
Synthetic Polymer (Copolymer of Polyethylene or Resin)
Mineraloid-like Synthetic Material
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Raw Diamond
Carbon (C)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Blue Sapphire
Corundum (Al2O3)
gemstone
Limonite (Iron Ore)
Goethite and related iron hydroxides (FeO(OH)·nH2O)
mineral
Slate
Foliated Metamorphic Rock
metamorphic
Bauxite
Al2O3·2H2O (Aluminum Hydroxide)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Dacite
Dacite (intermediate volcanic rock high in silica)
igneous
Glauconitic Sandstone
Glauconitic Quartz Arenite (with K,Mg,Fe,Al silicate hydroxide)
sedimentary
Basalt Water-Worn Pebble
Aphanitic Mafic Igneous Rock
igneous
Scoria
Scoria (vesicular volcanic rock)
igneous
Bog Iron (Limonite)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
sedimentary
Pumice
Pumice (a vesicular volcanic glass)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Vesicular basalt (possibly industrial slag)
Basalt, chiefly plagioclase + pyroxene ± olivine; exact identification is uncertain from the image
igneous
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
sedimentary (man-made/anthropogenic)
Weathered metallic fragment, possibly iron meteorite or industrial slag
Uncertain; candidate iron meteorite (Fe–Ni alloy), but terrestrial slag or corroded metal is also plausible
meteorite
Bauxite (Laterite)
Hydrated aluminum oxides (Al2O3·nH2O)
sedimentary
Small metallic meteorite fragment (probable stony-iron or iron meteorite)
Unclassified meteoritic material; exact classification requires chemical and petrographic testing
meteorite
Blue glassy mineral fragment, possibly kyanite or blue quartz
Indeterminate from image; candidates include kyanite (Al₂SiO₅) or blue quartz (SiO₂)
mineral
Industrial slag (iron/copper smelting slag)
Multiphase vitreous metallurgical slag; commonly iron-silicate glass with metal-oxide and metallic inclusions
mineral
Diamond (in Matrix)
Carbon (C)
mineral
Anthracite Coal
Anthracite (Carbon based fossil fuel)
metamorphic
Unidentified gray metallic object
Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material
mineral