Industrial Byproduct (Anthropogenic Rock Like Material)

Sandstone (likely Quartzite-rich)

Arenite (primarily SiO2)

Sandstone

Arenite (Clastic Sedimentary Rock)

Sandstone

Arenite (SiO2 based clastic rock)

Porous iron-rich rock or slag-like material

Unidentified; possibly limonite/goethite-rich ironstone

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Red Sandstone

Ferruginous Sandstone (SiO2 with Fe2O3)

Asphalt Concrete

Bituminous conglomerate

Likely polished bronzite or serpentine-rich rock

Probable bronzite, an iron-bearing orthopyroxene (Mg,Fe)SiO₃; exact identification requires testing

Crushed Stone (Gravel/Aggregates)

Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)

Schist

Schist (Crystalline metamorphic rock)

Silver (Native Element)

Ag (Argentum)

Granodiorite

Granodiorite

Agate

Silicon Dioxide (Chalcedony), SiO2

Granite-like pegmatitic rock

Coarse-grained granitoid, likely quartz–feldspar–mica aggregate

Mica Schist

Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)

Granite Pegmatite with Muscovite Mica

Granite Pegmatite (Silicon Dioxide and complex silicates)

Orange Calcite

Calcium Carbonate (CaCO3)

Fluorite (Fluor-spar)

Calcium Fluoride (CaF2)

Anthracite Coal with Sulfur staining

Anthracite (Carbon C with impurities)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)

Blue Dyed Quartzite

Silicon Dioxide (SiO2) with artificial pigment

Chert (Arrowhead or Flake)

Microcrystalline quartz (SiO2)

Small dark mineral/rock fragment

Indeterminate; possibly magnetite-bearing basalt or iron-rich slag

Serpentine / Serpentinite (with Weathering Crust)

Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Chert Arrowhead

Microcrystalline Quartz (SiO2)

Greenstone Celt (Polished Stone Axe)

Metamorphosed mafic rock (often Basalt or Diabase)

Granodiorite Pebble

Granodiorite

Amethyst cluster

Amethyst, purple quartz (SiO₂)

River Siltstone / Mudstone Pebble

Siltstone (composed of mixed silicate and carbonate minerals)

Bauxite

Aluminum ore (mixture of gibbsite Al(OH)3, boehmite γ-AlO(OH), and diaspore α-AlO(OH))

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

Possible iron-rich chert or slag-like rock

Microcrystalline quartz (SiO₂), possibly iron-stained chert; exact identification is uncertain from the image

Sandstone

Arenite (primarily SiO2)

Ferruginous Sandstone

Ferruginous Clastic Sedimentary Rock

Basalt

Basalt (Mafic volcanic rock)

Iron-stained quartz-rich cobble, possibly weathered granite or quartz vein rock

Quartz–feldspar aggregate with iron-oxide staining; exact classification is uncertain from the photograph

Banded Chert

Microcrystalline Quartz (SiO2)

Asphalt (Bituminous Slate/Sandstone)

Asphaltum / Bituminous Rock

Peridot (Olivine)

Olivine ((Mg, Fe)2SiO4)

Iron-stained quartz vein in weathered host rock

Quartz (SiO₂) with iron-oxide/hydroxide staining; host rock undetermined

Serpentine-rich rock (possibly lizardite/serpentinite)

Serpentinite, composed chiefly of serpentine-group minerals such as lizardite, antigorite, or chrysotile