Mineral Precipitate (Anthropogenic Context)

Peridotite (Olivine)

Peridotite (comprising (Mg,Fe)2SiO4)

Ironstone Concretion

Limonitic/Hematitic Concretion

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)

Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)

Greenstone

Greenschist (composed of chlorite, actinolite, and epidote)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Hematite

Iron Oxide (Fe2O3)

Chert (Arrowhead/Tool variety)

Microcrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Chert / Flint Arrowheads

Cryptocrystalline Quartz (SiO2)

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)

Native Copper

Copper (Cu)

Weathered sandstone fragment

Quartz-rich sandstone, possibly ferruginous sandstone

Obsidian Arrowhead

Obsidian (Volcanic Glass)

Rounded pink granite or granitic river pebble

Granite; mainly quartz (SiO₂), alkali feldspar, plagioclase, and minor mica/iron oxides

Chert (Nodule)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

River Cobble (Conglomerate context)

Unconsolidated Fluvial Alluvium (comprised of various lithologies like Quartzite, Granite, or Basalt)

Jasper with Iron Staining

Silicon Dioxide (SiO2) with impurities

Ironstone concretion (possibly pyrite-bearing)

Iron-rich sedimentary concretion, likely composed of goethite/limonite with possible pyrite

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Iron-stained rock fragment, possibly quartz-rich

Unidentified quartz-rich rock with iron-oxide staining (likely hematite/goethite)

Flint (chert), likely a worked stone flake

Microcrystalline quartz (SiO₂); cryptocrystalline variety of quartz

Weathered quartz-rich rock (likely quartzite)

Quartzite, composed predominantly of quartz (SiO₂); identification is tentative from the photo

Weathered quartz-rich rock, likely sandstone or quartzite

Quartz (SiO₂)-rich sandstone; possibly partially metamorphosed quartzite

Red Jasper

Silicon Dioxide (SiO2) with Iron inclusions

Gossan (Iron Hat) with Quartz and Chlorite

Limonite/Goethite-rich Gossan (FeO(OH)·nH2O) with inclusions of Quartz and Chlorite

Iron-stained chert (flint) nodule

Microcrystalline quartz (SiO₂), with iron-oxide staining

Granodiorite

Granodiorite

Basalt

Basalt (Mafic volcanic rock)

Chert (specifically Flint Arrowhead)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Serpentinite

Serpentinite (containing minerals of the Serpentine subgroup: Antigorite, Lizardite, and Chrysotile; formula (Mg,Fe)3Si2O5(OH)4)

Red Jasper

Opaque microcrystalline Quartz (SiO2 with Fe2O3 inclusions)

Slag

Anthropogenic Vitreous Silicate / Ferro-silicate Slag

Leopard Skin Jasper

SiO2 (Microcrystalline Quartz with inclusions)

Vesicular basalt (scoria-like volcanic rock)

Basalt, composed mainly of plagioclase, pyroxene, and olivine; abundant vesicles formed by trapped gas

Weathered quartz-rich rock, possibly chert or quartzite

Likely microcrystalline quartz (SiO₂), but exact identification is uncertain from the photograph

Amethyst Geode Fragment

Quartz (SiO2) with trace iron impurities

Psilomelane (Black Hematite varietal)

Barium Manganese Oxide (Ba,H2O)2Mn5O10

Polished serpentine (likely greenstone)

Serpentine-group minerals, chiefly antigorite/lizardite: Mg₃Si₂O₅(OH)₄

Green Quartzite (Aventurine-like)

Quartzite (primarily SiO2 with chromium-rich mica or chlorite inclusions)

Weathered iron-rich concretion or sedimentary rock

Likely ferruginous sandstone or ironstone concretion; exact identification is not possible from the image alone