Mineral Description (Anthropogenic Material)

Greenstone / Epidosite

Epidosite (Metasomatic rock consisting mainly of Epidite Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz)

Ironstone Concretion

Ironstone (primarily Siderite or Limonite)

Fossilized Shark Tooth (Otodus)

Otodus obliquus

Quartz pebble

Silicon dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Quartz

Silicon dioxide (SiO2)

Banded agate (likely carnelian/chalcedony)

Microcrystalline quartz, SiO₂; iron-stained chalcedony

Geode or Concretion

Silica-filled nodule (likely SiO2)

Fulgurite

Lechatelierite (vitreous silica)

Yellow jasper or polished yellow chalcedony

Microcrystalline quartz, SiO₂, likely iron-stained jasper/chalcedony

Breciated Limestone with Calcite Veins

Sedimentary Breccia (CaCO3)

Petrified Wood

Silicified Wood (primarily SiO2)

Quartz with Iron Oxide

Silicon Dioxide (SiO2) with Fe2O3 inclusions

Veined Pebble (Septarian or Quartz-Veined Chert/Basalt)

Silicon Dioxide (SiO2) veins in matrix

Jasper (Multi-color Chert)

Silicon Dioxide (SiO2) with impurities

Sandstone

Clastic sedimentary rock composed mainly of quartz sand

Petrified Wood

Silicified Wood (primarily SiO2)

Fossilized Shark Tooth

Bioapatite (Calcium Hydroxyapatite) replacement

Fossilized coral or carbonate fossil fragment

Calcareous fossil, likely colonial coral (order Hexacorallia; uncertain from image)

Granite Cobble / Gneiss (River Rock)

Granitic Gneiss / Felsic Igneous Rock

Fossil Shark Tooth

Selachii fossil

Mammoth Tooth

Mammuthus tooth

Fossilized Horse Tooth

Equus sp. (Tooth)

Chert

Silicon dioxide (SiO2)

Shungite

Non-crystalline carbon (allotrope of carbon)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Anthracite Coal

Carbon (with trace impurities)

Chalcedony Agate / Carnelian nodules in Matrix

SiO2 (Silicon Dioxide) with iron oxide inclusions

Sandstone

Arenite (composed primarily of SiO2)

Fulgurite

Lechatelierite

Onyx (Black) and Mother of Pearl Inlay

Silicon Dioxide (SiO2) for Onyx; Aragonite (CaCO3) for Mother of Pearl

Sandstone (likely Arkosic or Lithic)

Clastic Sedimentary Rock (SiO2 with accessory minerals)

Limonite (Yellow Ochre)

FeO(OH)·nH2O (Hydrous iron(III) oxide-hydroxide mixture)

Petrified Wood

Fossilized wood / Silicified wood

Tumbled serpentine (likely)

Serpentine-group minerals, commonly lizardite or antigorite; approximate composition Mg₃Si₂O₅(OH)₄

Sandstone

Sedimentary Rock (Quartz arenite)

Magnetite-rich iron ore

Magnetite (Fe₃O₄), possibly with hematite and silicate matrix

Sapphire

Corundum (Al2O3)

River Siltstone / Mudstone Pebble

Siltstone (composed of mixed silicate and carbonate minerals)

Quartz in Matrix (possibly Basalt or Siltstone host)

Silicon Dioxide (SiO2) in Host Rock

Sandstone

Arenite

Quartz

Silicon Dioxide (SiO2)