Synthetic (Not A Rock Or Mineral)

Man-made Blank Ammunition (Brass)

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

Diamond

Carbon (C), Native Element

White chalcedony (possibly milky quartz) cabochon

Chalcedony, microcrystalline SiO₂; appearance may also represent milky quartz or synthetic imitation

Granite

Granite (a felsic intrusive igneous rock)

Goldstone (Red/Brown)

Aventurine Glass (SiO2 with Copper inclusions)

Copper Ore / Altered Granodiorite

Cupriferous rock with silicate gangue

Cut colorless gemstone, likely quartz or glass imitation

Most plausibly rock crystal (clear quartz, SiO₂); synthetic glass cannot be ruled out from the image

Banded Iron Formation (Fragment)

Banded Iron Formation (BIF)

Biological Bone (Patella/Knee)

Patella (part of the Human Skeletal System)

Azurite-Malachite (often a mixed specimen)

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2(CO3)(OH)2. The specimen appears to be a natural mixture or intergrowth of these two minerals.

Diamond (Rough)

Diamond (Carbon, C)

Crystal Quartz Beads (likely Clear Quartz)

Quartz (SiO₂)

Basalt with Quartz Vein

Mafic volcanic rock with hydrothermal SiO2 filling

Oak-grain Laminate (Industrial/Decorative Furniture Finish)

Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)

Bowling Ball (Brunswick T-Zone Deep Space)

Polyester resin / Polyurethane polymer

Diamond (appearing as a jewelry centerpiece)

Diamond (Formula: C)

Granite (weathered cobble)

Granite; chiefly quartz, feldspar, and mica/amphibole

Honey-colored chalcedony (possibly yellow/orange agate or carnelian)

Chalcedony, a microcrystalline variety of quartz; SiO₂. The color may result from iron-oxide inclusions. Exact identification is uncertain from a photograph alone.

Likely granite pebble

Granite, a quartz–feldspar–mica intrusive igneous rock

Vesicular basalt (possibly gold-bearing or mineral-veined basalt)

Basalt, a mafic volcanic rock composed chiefly of plagioclase feldspar, clinopyroxene, and often olivine

Rock Specimen

Unclassified rock specimen

Basalt with Xenolith

Extrusive Igneous Rock containing Mantle Xenolith

Sapphire

Corundum (Al2O3)

Black Tourmaline (Schorl)

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Blue Goldstone

Aventurine Glass

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Strawberry Quartz

Silicon Dioxide (SiO2) with inclusions of Goethite or Hematite

Bauxite Ore

Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Granite

Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)

Red Sandstone

Clastic Sandstone (typically Quartz-rich with Iron Oxide)

Coarse-grained gray metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss (probable)

Sandstone

Arenite

Emerald

Beryl (Be3Al2Si6O18), specifically the green variety colored by chromium or vanadium

Druzy Quartz on Limestone

Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)

River Rock

Sedimentary clast

Basalt with Quartz Vein

Extrusive Igneous Rock / Volcanic Rock

Geode (Quartz / Chalcedony Geode)

SiO2 (Silicon Dioxide)

Likely tumbled greenstone (identity uncertain)

Greenstone: metamorphosed mafic volcanic rock, commonly composed of chlorite, actinolite, and epidote

Crushed Granite and Basalt

Phaneritic Igneous Rock / Aphanitic Igneous Rock

Vesicular Basalt

Vesicular Basalt

Sodalite

Sodalite (Na4Al3Si3O12Cl)