Man Made Material (Anthro Lithic Product)

Milky Quartz

Silicon Dioxide (SiO2)

Diamond

Carbon (C)

Carved labradorite fish

Labradorite, calcium-rich plagioclase feldspar (approximately (Ca,Na)(Al,Si)₄O₈)

Clay Brick

Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)

Weathered quartz-rich mineral nodule

Likely quartz (SiO₂) with iron-oxide staining and possibly feldspar/mica; exact identification requires testing

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Green Slag Glass

Amorphous Silicon Dioxide (with metallic impurities)

Chert Nodules (with Flint core)

Microcrystalline Quartz (SiO2)

Quartz vein specimen, likely milky quartz with iron-stained host rock

Quartz (SiO₂), possibly with chalcedony and sulfide/oxide-bearing matrix

Weathered, vesicular volcanic rock (likely pumice/scoria)

Pumice or scoriaceous basalt; composition likely volcanic glass with feldspar, pyroxene, and minor iron oxides

Tumbled chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper

Weathered stone nodule or concretion

Unidentified lithic concretion; composition cannot be determined from the image

Pumice

Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)

Weathered granite pebble

Granite, mainly quartz, feldspar, and mica; approximate composition SiO₂-rich continental crust

Vesicular basalt (likely scoriaceous basalt)

Basalt; chiefly plagioclase, clinopyroxene, and Fe–Mg minerals, with possible olivine and iron oxides

Rounded sandstone boulder

Quartz-rich sandstone, likely arkosic or lithic sandstone

Mixed small pebbles and mineral grains

Unidentified detrital sediment; likely quartz-, feldspar-, and lithic fragments

Weathered sandstone

Quartz-rich sandstone, likely arkose or lithic sandstone

Rounded sandstone pebble

Quartz-rich sandstone, commonly arkose or lithic sandstone

Unidentifiable embedded dark fragment

Indeterminate; possibly a dark silicate mineral or lithic inclusion

Flint (gray chert)

Microcrystalline quartz (SiO₂), a variety of chert

Obsidian with Slate/Tuff

Volcanic glass (SiO2) with associated pyroclastic rock

Chert (Honey Chert / Flint)

Silicon Dioxide (SiO2)

Chert

Microcrystalline silica (SiO2)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Chert (Jasper/Flint)

Silicon Dioxide (SiO2)

Chert (and Agate/Chalcedony)

Microcrystalline Quartz (SiO2)

Weathered iron-rich geode or cavity fragment

Limonite/goethite-rich material, likely coating a weathered basaltic or volcanic host rock

Mixed beach gravel and sand

Unsorted siliciclastic sediment, chiefly quartz and rock fragments

Blue kyanite

Kyanite (Al₂SiO₅)

Chert / Flint

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Weathered sandstone fragment

Quartz-rich sandstone, likely feldspathic or lithic sandstone

Chalcedony (likely blue agate) knapped into an arrowhead

Microcrystalline quartz, SiO₂ (chalcedony)

Weathered sandstone boulder

Quartz-rich sandstone, likely arkose or lithic sandstone

Chert (Flint)

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock - Arenite

Tumbled chalcedony or quartz

Microcrystalline silica, SiO₂ (likely chalcedony; possibly milky quartz)

Likely graphite-rich schist (possibly galena-bearing metamorphic rock)

Graphite schist; chiefly quartz–mica with graphite (identification uncertain from photograph)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossilized bivalve shell (small cockle-type shell)

Bivalvia; exact species cannot be determined from the image

Weathered sandstone (probable)

Quartz-rich sandstone; mainly SiO₂ with feldspar and lithic grains

Quartz-bearing metamorphic rock, likely quartzite with dark mica/amphibole

Quartzite or quartz-rich schist; chiefly SiO₂ quartz with biotite, hornblende/amphibole, and iron-oxide staining