Man Made Material, Not A Natural Rock Or Mineral Specimen

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Raw emerald-bearing beryl (probable)

Beryl, Be₃Al₂Si₆O₁₈; green color from trace chromium and/or vanadium

Chert (Green Fossilized Algae or Jasper)

Silicon Dioxide (SiO2)

Raw greenish-blue quartz-bearing mineral specimen

Likely fluorite or chalcedony/quartz; exact identification requires hardness and crystal tests

Tumbled rose quartz

Quartz, silicon dioxide (SiO₂), pink variety

Granite

Granite (Phaneritic Igneous Rock)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 major component)

Likely polished bronzite or serpentine-rich rock

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

Tumbled amethyst

Quartz, purple variety (SiO₂), colored by trace iron and irradiation

Amethyst

Amethyst (SiO2)

Quartz Boulder

Silicon Dioxide (SiO2)

Likely quartz fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock

Feldspar-rich igneous rock, likely granite or gneiss fragment

Granite-like quartz–feldspar rock; exact identification is uncertain from the blurred image

Shale (with Iron Oxide staining)

Fissile Mudstone (primarily Quartz and Clay minerals)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Likely polished basalt with pale mineral inclusions

Basalt; inclusions possibly calcite, quartz, or weathered feldspar

Chert (Jasper/Common Opal mix)

Microcrystalline Quartz (SiO2)

Epidotite (Unakite-related)

Epidote-rich rock

Petrified Wood

Silicified Wood (SiO2)

River Quartz (Milky and Smoky mix)

Silicon Dioxide (SiO2)

Blue Agate Geode (Dyed)

Cryptocrystalline Quartz (SiO2)

Granite Pebble

Granite (Plutonic Igneous Rock)

Small white mineral fragment

Indeterminate; possibly quartz, calcite, or feldspar

Grey Chalcedony

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO2)

Amethyst Cluster

Silicon Dioxide (SiO2) with iron impurities

Sandstone (Quartzose)

Arenite (primarily SiO2)

Likely weathered quartz-rich stone

Indeterminate; possibly quartz-bearing granite or milky quartz

Banded sandstone pebble

Quartz-rich lithic sandstone; exact provenance and composition require testing

Sandstone

Arenite (SiO2 dominated sandstone)

Rough Diamond

Diamond (pure Carbon, C)

Chalcedony in Matrix (likely Agatized Coral or Chert)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily Quartz-rich)

Dalmatian jasper

Dalmatian stone, typically a leucocratic alkali-feldspar-rich porphyritic igneous rock with black arfvedsonite or aegirine inclusions

Man-made Blank Ammunition (Brass)

CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)

Granite

Phaneritic Felsic Igneous Rock

Tumbled amethyst

Quartz, purple variety; silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation

Granite

Granite (Phaneritic Igneous Rock)

Polished malachite tower

Malachite, Cu₂CO₃(OH)₂ (basic copper carbonate)