Man Made Material (Anthro Lithic Product)

Quartz-rich pegmatite with mica

Granitic pegmatite; mainly quartz (SiO₂), feldspar, and muscovite/biotite mica, with possible sulfide or iron-oxide staining

Sandstone (Greywacke/Lithic Sandstone)

Clastic Sedimentary Rock (Lithic Sandstone)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Quartz-veined Greywacke

Silicon dioxide (SiO2) in Lithic Sandstone

Polished dark river pebble

Indeterminate; likely basalt or fine-grained mafic rock

Chert / Flint

Cryptocrystalline quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Flint (chert)

Microcrystalline quartz (SiO₂), commonly called chert or flint

Weathered sandstone or arkose fragment

Clastic sandstone, likely quartz–feldspar-rich (arkose); exact identification requires testing

Scoria (vesicular basalt)

Scoria; mafic volcanic rock composed mainly of plagioclase, pyroxene, and often olivine

Pumice

Pumice

Sandstone

Sedimentary Rock (Quartz arenite/Arkose)

Quartzite Pebble

Metamorphic Quartz (SiO2)

Weathered conglomeratic river pebble

Polymictic conglomerate, likely ferruginous chert/sandstone matrix

Weathered iron-rich chert or jasper pebble

Microcrystalline quartz (SiO₂), likely ferruginous chert/jasper

Rounded river cobble, likely weathered sandstone or quartzite

Indeterminate clastic silicate rock; possibly quartz-rich sandstone (SiO₂-dominant)

Chert / Jasper

Silicon Dioxide (SiO2)

Chert (Brown Variety)

Microcrystalline Quartz (SiO2)

Chert (specifically Flint or Gray Chert)

Silicon Dioxide (SiO2)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Pearl necklace

Pearl, primarily aragonite (CaCO₃) and conchiolin

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Conglomeratic sandstone or breccia specimen

Quartz-rich clastic sedimentary rock; likely sandstone with pebble-sized quartz, feldspar, and lithic clasts

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions

Chert (Lithic flake / Arrowhead fragment)

Microcrystalline Quartz (SiO2)

Polished greenstone/serpentine pebble (probable)

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

Small brown rock fragment; exact identification uncertain

Unidentified fine-grained lithic fragment

Blue slag-like mineral specimen, possibly bornite or chalcopyrite

Tentatively bornite (Cu5FeS4) or iridescent chalcopyrite (CuFeS2)

Red Sandstone

Clastic Sedimentary Rock (typically contains Quartz and Iron Oxide)

Possible flint or slag fragment

Microcrystalline quartz (chalcedony), or iron-rich industrial slag

Rounded sandstone cobble

Quartz-rich sandstone, likely arkosic or ferruginous sandstone

Red Sandstone (Arkose)

Clastic Sedimentary Rock (Lithic Arkose)

Banded Iron Formation (BIF)

Banded Iron Formation (Magnetite-Hematite-Chert)

Chert (Flint)

Silicon dioxide (SiO2)

Iron Slag

Ferrous Slag (Silicate/Oxide mixture)

Sandstone (Quartzose)

Arenite (SiO2 based)

Likely iron-rich slag or weathered ironstone

Hematite–goethite-rich material (Fe₂O₃/FeO(OH)); possibly industrial iron slag

Jasper

Silicon dioxide (SiO2)

Quartzite Arrowhead (Archaeological Lithic)

Recrystallized Quartz (SiO2)

Chert (Yellow Jasper/Quartzite Pebble)

Microcrystalline Silicon Dioxide (SiO2)

Weathered iron-rich sandstone pebble

Ferruginous sandstone, chiefly quartz (SiO₂) cemented by iron oxides/hydroxides