Man Made Material (Metal)

Quartz Vein in Sandstone

Hydrothermal Quartz (SiO2) in Arenite

Diamond (set in a gold ring)

Carbon (C) - Adamantine cubic carbon

Diamond

Diamond (C)

Chert (Arrowhead or Projectile Point)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Geode fragment, likely quartz-lined basalt or chalcedony nodule

Microcrystalline quartz (SiO₂), possibly with iron-oxide staining in a basaltic host

Chert Breccia

Brecciated Chert (Microcrystalline Silica, SiO2)

Tumbled pale green aventurine (probable)

Quartz, SiO₂, with dispersed fuchsite or other green inclusions

Possible iron-rich basalt or industrial slag

Basalt, likely Fe–Mg silicate rock; exact identification is uncertain from the blurred image

Pumice

Pumice (a highly vesicular volcanic rock)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Granite

Granite

Limestone

Calcium Carbonate (CaCO3)

Quartzite River Rock (with Quartz Vein)

Quartzite (SiO2)

Polished/tumbled quartz-rich pegmatite

Quartz–feldspar pegmatite, with iron-oxide staining; chiefly SiO₂ and KAlSi₃O₈–NaAlSi₃O₈

Pink-and-white quartz-rich rock, likely rose quartz matrix

Quartz (SiO₂), possibly intergrown with feldspar or chalcedony

Rounded gray pebble, likely basalt or andesite

Fine-grained volcanic rock, probably basaltic-andesite; exact identification requires testing

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or feldspar

Tumbled white quartz or quartzite pebble

Quartz (SiO₂), possibly massive quartzite

Red Sandstone

Arenite (with iron oxide cement)

Polished amber-colored stone, possibly chert or jasper

Uncertain from image; likely microcrystalline quartz (SiO₂) if chert/jasper

Quartz

SiO2

Sandstone

Clastic Sedimentary Rock

Quartz Pebble

Silicon Dioxide (SiO2)

Pebble

Lithic fragment / Water-worn rock

Sandstone

Sedimentary Rock (Quartz arenite)

Red Sandstone

Quartzose Sandstone (primarily quartz grains cemented by iron oxides)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone with Iron Weathering

Quartz Arenite / Weathered Sandstone

Quartz Boulder

Silicon Dioxide (SiO2)

Conglomerate

Clastic sedimentary rock (Conglomerate)

Sandstone Pebble

Sandstone (SiO2 rich clastic rock)

Red Sandstone

Quartz Arenite (iron-stained)

Unakite

Altered Granite (Epidotized Granite)

Sandstone (Quartzose Sandstone)

Sandstone (SiO2 dominant composition)

Gravel / Limestone Fragment

Calcium Carbonate (CaCO3) / Fine-grained Sedimentary Rock

Quartzite pebble

Metamorphic Quartzite (SiO2)

Quartzite (or Quartz)

SiO2 (Silicon Dioxide)

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Quartz (Milky Quartz / Quartz Crystal)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Granite

Granite (Plutonic Igneous Rock)

Quartz Pebble

Silicon Dioxide (SiO2)