Anthropogenic Material

Asphalt Chunk

Asphalt concrete

Quartzite

Quartzite (SiO2-rich metamorphic rock)

Sandstone

Arenite (primary component SiO2)

Sandstone

Arenite (SiO2 based)

Weathered quartz-rich rock, possibly granite or quartzite

Indeterminate; likely quartz–feldspar aggregate, potentially granitic or quartzitic material

Engineer Quartz/Quartzite

SiO2 (Silicon Dioxide with binders)

Ferrochrome Slag

Calcium-Aluminium-Magnesium Silicate Slag

Limestone

Calcium Carbonate (CaCO3)

Tektite (Indochinite)

Tektite (High-silica impact glass)

Chert Pebble

Microcrystalline silica (SiO2)

Beads (likely glass or man-made material)

N/A (artificial material)

Rounded brown chert or jasper pebble

Microcrystalline quartz (SiO₂), likely ferruginous chert/jasper

Epidote-rich rock (likely epidotite or altered basalt)

Epidote, Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH); possibly epidote-bearing mafic rock

Sandstone

Arenite (primarily SiO2)

Garnet Schist

Garnetiferous Mica Schist

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Jasper / Chert (Red)

Cryptocrystalline quartz (SiO2)

Tumbled quartz-rich stone, likely orange chalcedony or iron-stained quartzite

Microcrystalline quartz (SiO₂), possibly quartzite; orange coloration from iron oxides

Cubic Zirconia

Zirconium dioxide (ZrO2)

Tumbled cream-colored pebble

Likely quartz-rich sandstone or limestone; exact identification requires testing

Rough amethyst-bearing quartz specimens

Quartz, SiO₂; purple coloration from trace iron and irradiation

Petrified Wood (Jet or Coalified Wood appearance)

Silicified wood (principally SiO2) or Carbonized Wood

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Orbicular Granite (specifically Mustard or Yellow Tonalite/Granodiorite)

Orbicular Quartz Diorite / Tonalite

Limestone (Weathered)

Sedimentary Carbonate Rock (CaCO3)

Polished botryoidal jasper/chalcedony (likely ocean jasper)

Microcrystalline quartz, SiO₂, with iron-oxide and other mineral inclusions

Tumbled brown stone, possibly chert or iron-stained quartzite

Indeterminate from photograph; possible microcrystalline quartz (SiO₂)

Brown chalcedony (likely jasper or petrified wood fragment)

Microcrystalline quartz, SiO₂; brown coloration likely from iron oxides

Tumbled fossil shark tooth pendant

Likely fossilized shark tooth, possibly Otodus or Carcharhinus; exact species cannot be confirmed from the image

Tumbled orange chalcedony or common opal

Microcrystalline quartz (SiO₂), possibly hydrated silica opal (SiO₂·nH₂O)

Tumbled blue-gray mineral specimen

Indeterminate; possibly dumortierite quartz, sodalite, or dyed stone

Polished greenstone/serpentine pebble (probable)

Serpentinite, dominated by serpentine-group minerals (lizardite/chrysotile); possible accessory olivine or chlorite

Chert or flint nodule

Microcrystalline quartz (SiO₂), commonly chalcedony with possible iron-oxide staining

Polished orbicular basalt (likely)

Basalt, a fine-grained mafic volcanic rock; dark circular features may be amygdales or orbicules

Tumbled coral fragment (likely white calcitic coral)

Calcium carbonate, primarily aragonite or calcite (CaCO₃); exact coral genus cannot be determined from the image

Botryoidal chalcedony (possibly common opal)

Microcrystalline quartz, SiO₂; pale portions may include hydrated silica opal, SiO₂·nH₂O

Quartzite

Quartzite (SiO2)

Polished green-and-white stone, likely serpentine or nephrite jade

Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (interlocking actinolite–tremolite)

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Serpentine

Hydrous magnesium iron silicate, (Mg,Fe)3Si2O5(OH)4

Limestone

Calcite (CaCO3)