Sedimentary Rock Or Mineral (Depending On Origin And Purity)

Druzy Quartz (on Geode Fragment)

Silicon Dioxide (SiO2)

Sandstone

Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)

Spider Conch Shell

Lambis lambis (Calcium Carbonate, CaCO3)

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)

Flint

Microcrystalline quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Sandstone

Arenite

Emerald crystal in host rock

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Educational Geologic Collection

Mixed Mineral and Rock Collection (Various compositions)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Shatter Cone

Impactite (Shatter Cone texture)

Small dark metallic-looking rock fragment

Undetermined; possibly iron oxide-rich material or a metallic mineral

Jasper with Quartz Vein

Silicon Dioxide (SiO2) with impurities

Pink Granite

Phaneritic intrusive igneous rock (Feldspar-Quartz-Mica)

Sandstone (Ferruginous)

Arenite (with Iron Oxides)

Fossilized cylindrical shell or bone fragment

Indeterminate biogenic carbonate or phosphatic fossil; possible fragment of a tubular shell (e.g., scaphopod) or hollow bone

Quartz (Grain)

Silicon Dioxide (SiO2)

Sandstone with Concretions / Liesegang Rings

Arenite with iron oxide banding

Sandstone / Weathered Quartzite

Sandstone (Quartz Arenite)

Manganese Dendrite on Siltstone

Manganese Oxide (pyrolusite or psilomelane) Dendrites

Ruby

Corundum (Al2O3 with Chromium trace)

Likely iron-rich rock or metallic mineral fragment

Uncertain; possibly limonite/goethite-rich material or weathered iron meteorite fragment

Fluorite (Rainbow Fluorite)

Calcium Fluoride (CaF2)

Ruby

Corundum (Al2O3 with Chromium traces)

Chert

Microcrystalline Quartz (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Ruby

Corundum (Al2O3 with Chromium traces)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Native Silver Nugget

Silver (Ag)

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Sandstone

Arenite (SiO2 + various cementing minerals)

Sapphire

Corundum (Al2O3)

Shungite (or Black Onyx / Obsidian)

Amorphous Carbon (Shungite) / SiO2 (Onyx/Obsidian)

Emerald

Beryl (Be3Al2(SiO3)6)

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Blue Sapphire

Corundum (Al2O3) with traces of Iron and Titanium

Sandstone (Weathered Cobble)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

Hematitic Sandstone

Sandstone with Iron Oxide (Hematite) staining

Chert (Black Chert)

Microcrystalline Silica (SiO2)

Pink Granite

Felsic Intrusive Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)