Mineral (Sedimentary Context)

Rhodonite

Manganese silicate (Mn,Fe,Mg,Ca)SiO3

Hag Stone

Perforated Sandstone (composed of SiO2 and calcareous cement)

Quartz

Quartz (SiO2)

Quartz geode or vuggy quartz vein fragment

Quartz (SiO₂), likely with minor iron oxides and host carbonate or silicate minerals

Chert (specifically Flint or Dark Chert)

Silicon Dioxide (SiO2)

Quartz-rich hydrothermal specimen, likely milky quartz with calcite

Quartz (SiO₂), with probable calcite (CaCO₃) and iron-oxide staining

Angular gray rock fragments

Unidentified fine-grained rock; the image does not show diagnostic features sufficient for a specific identification

Large granite boulder

Granite, a coarse-grained intrusive igneous rock composed mainly of quartz, feldspar, and mica

Quartz crystal cluster (likely druzy quartz)

Quartz, silicon dioxide (SiO₂)

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Sodium Polyacrylate (Superabsorbent Polymer)

Sodium Polyacrylate [-CH2-CH(COONa)-]n

Ammonite fossil

Ammonoidea (likely an involute ammonite; exact genus requires preparation and context)

Chert (Arrowhead/Projectile Point)

Chert (Cryptocrystalline Quartz, SiO2)

Gold Nugget

Native Gold (Au)

Green Moonstone (Garnierite)

Nickel-bearing Magnesium Silicate (often a mix of Serpentine and Talc/Chlorite groups)

Iron-rich slag or ironstone; appearance is not diagnostic

Likely iron-oxide-rich material (hematite, Fe₂O₃, and/or magnetite, Fe₃O₄); possibly smelting slag

Likely flint/chert fragments

Microcrystalline quartz (SiO₂), possibly fossil-bearing chert

Weathered granitic rock (likely granite or granodiorite)

Granite–granodiorite; mainly quartz, feldspar, and mica/hornblende

Greenstone / Greenschist

Greenschist (containing Chlorite, Epidote, Actinolite)

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Amethyst (rough crystal)

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation

Native gold nugget or flake

Native gold (Au), possibly with minor silver/electrum

Iron-Nickel Meteorite fragment

Siderite (meteoritic iron), composed primarily of Kamacite (α-(Fe,Ni)) and Taenite (γ-(Fe,Ni))

Yellow Chert (Jasper)

Silicon Dioxide (SiO2)

Likely ironstone or ferruginous sandstone fragment

Iron-oxide-cemented sandstone; commonly quartz grains cemented by hematite/goethite (composition cannot be confirmed from the image)

Mica-rich schist (likely biotite schist)

Biotite–quartz–feldspar schist; mica is chiefly biotite, K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Flint or chert

Microcrystalline quartz (SiO₂), commonly chalcedony with possible impurities

Ferruginous Sandstone (with Laterite)

Ferruginous Arenite (FeO(OH)·nH2O)

Weathered gray stone, likely granite or gneiss

Probable granitic rock; exact identification is uncertain from the image

Dark granitic gneiss or fine-grained granite

Biotite granite, possibly weakly foliated gneiss; quartz–feldspar–biotite assemblage

Reddish-brown, iron-stained rock fragment

Indeterminate; possibly weathered porphyritic volcanic rock

Fossilized shell fragment

Likely a fossil mollusk shell; exact taxon cannot be determined from the image

Orange glassy slag (industrial by-product)

Iron-rich silicate glass; composition varies, commonly Fe–Ca–Al silicate

Chert (Nodule)

Chert (variety of microcrystalline quartz, SiO2)

Quartz-rich pegmatite, possibly with mica

Granite/pegmatite composed mainly of quartz (SiO₂), feldspar, and likely biotite or muscovite mica

Hypersthene

(Mg,Fe)SiO3 - Enstatite-Ferrosilite series

Blue Slag Glass

Man-made Silicon Dioxide (Amorphous)

Blue-gray kyanite crystal

Kyanite (Al₂SiO₅)

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)

Calcite

Granite Thin Section

Granitic rock (Phaneritic texture)

Tumbled amethyst

Amethyst, purple quartz (SiO₂)

Reddish sandstone fragment

Quartz-rich sandstone (likely iron-oxide stained; exact composition cannot be confirmed visually)