Rhodonite-bearing metamorphic rock
Rhodonite (MnSiO₃) with quartz and dark manganese oxides, likely a manganiferous schist or breccia
metamorphic
Category
Industrial Byproduct (Anthropogenic Material)
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Tumbled green jasper or serpentine
Jasper: microcrystalline quartz (SiO₂); possible serpentine: Mg₃Si₂O₅(OH)₄
mineral
Polished tiger iron
Tiger iron: banded quartz–crocidolite/jasper–hematite rock
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Tumbled white stone, possibly milky quartz
Milky quartz (quartz, SiO₂), identification uncertain from image
mineral
Tumbled jasper/chert pebble
Microcrystalline quartz (SiO₂), likely jasper or silicified chert
sedimentary
Polished ocean jasper (likely orbicular jasper)
Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and other silicates
mineral
Pink corundum (likely synthetic or treated sapphire)
Corundum, Al₂O₃; pink coloration commonly from chromium or treatment
gemstone
Sandstone
Arenite (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Siltstone
Siltstone (primarily composed of microcrystalline Quartz and Feldspar)
sedimentary
Moss-covered Rock Fragment
Weathered Rock Fragment with Epilithic Growth
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Green aventurine quartz sphere
Quartz, SiO₂, with fuchsite or other green mica inclusions
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Fossilized bivalve shell
Fossil Mollusca; likely a cemented or infaunal bivalve, possibly oyster or clam
fossil
Polished orange agate (likely carnelian)
Chalcedony, microcrystalline quartz (SiO₂); orange-red variety commonly called carnelian
mineral
Diamond
Natural Diamond (Carbon, C)
gemstone
Probable metallic meteorite fragment
Unclassified iron meteorite candidate, chiefly kamacite (α-Fe–Ni alloy)
meteorite
Engineered Quartz Stone
Agglomerated Quartz (SiO2 + Polymer Resin)
mineral-based composite
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia - ZrO2, Moissanite - SiC)
gemstone
Diamond
Diamond (C)
mineral
Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Likely quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Unidentified brown rock fragment
Indeterminate from image; likely a weathered iron-rich lithic fragment
igneous, sedimentary, metamorphic, mineral, gemstone, fossil, or meteorite
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Tumbled rose quartz
Quartz, silicon dioxide (SiO₂), rose-colored variety
mineral
Granite Pebble
Granite (Phaneritic intrusive igneous rock consisting of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Fossil brachiopod shell
Likely a ribbed orthid or productid brachiopod; exact genus cannot be determined from this image
fossil
Diamond
Diamond (pure Carbon, C)
mineral
Diamond
Diamond (pure carbon, C)
gemstone
Kaolinite (Chalky Clay)
Kaolinite (Al2Si2O5(OH)4)
sedimentary
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Fossilized tooth, likely mammalian molar
Silicified or mineral-replaced mammalian tooth; exact taxon cannot be determined from the image
fossil
Polished smoky quartz
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Polished agate nodule
Agate, microcrystalline quartz (SiO₂), likely with chalcedony and iron-oxide inclusions
gemstone
Smooth gray pebbles
Unidentified rounded rock fragments; composition cannot be determined from the image
igneous