Synthetic (Not A Natural Rock)

Granite

Granite (phaneritic intrusive felsic igneous rock)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Iron-rich weathered rock, likely limonite/goethite-bearing laterite

Limonite (variable hydrated iron oxides; chiefly goethite, α-FeO(OH))

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Sandstone (with possibly iron oxides and other minerals)

Sandstone

Chert (Jasper variety) with Iron Oxide staining

Cryptocrystalline Quartz (SiO2) with Goethite/Limonite impurities

Lapis lazuli and green-blue chalcedony jewelry

Lapis lazuli: lazurite-bearing metamorphic rock, chiefly lazurite (Na₃Ca(Al₃Si₃O₁₂)S) with calcite and pyrite; second stone: likely chrysoprase or green-blue chalcedony (microcrystalline quartz, SiO₂)

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)

Polished yellow jasper or opaque chalcedony bead

Microcrystalline quartz (SiO₂), likely iron-oxide-stained jasper

Tumbled purple agate (likely grape agate or amethystine chalcedony)

Microcrystalline quartz, SiO₂; purple coloration commonly from iron, manganese, or inclusions

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Blue Sapphire

Corundum (Al2O3 with iron and titanium trace elements)

Agate Slices and Clear Quartz Points

Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)

Black Tourmaline

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

Pearls

Pearl: biomineralized aragonite (CaCO₃) and conchiolin

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).

Granite

Granite (Felsic Plutonic Rock, consisting primarily of Quartz, Feldspar, and Mica)

Likely vertebra fossil or bone fragment

Indeterminate fossilized vertebra; mineralized hydroxyapatite, commonly Ca₅(PO₄)₃(OH)

Granite

Phaneritic Felsic Intrusive Rock (Granite)

Goldstone (aventurine glass)

Man-made copper-bearing glass; not a natural mineral (commonly sold as blue/brown goldstone)

Weathered sandstone pebble

Clastic sandstone, predominantly quartz (SiO₂) grains cemented by silica, calcite, or iron oxides

Quartzite Pebble

Quartzite (SiO2 with minor impurities)

Crushed Stone / Gravel (Multiple Rock Types)

Lithic fragments (undifferentiated)

Red Sandstone

Ferruginous Sandstone

Gold Nugget

Native Gold (Au)

Tumbled blue-green stone, likely aquamarine-bearing pegmatite or blue apatite

Probable fluorapatite, Ca5(PO4)3(F,Cl,OH), though visual identification is uncertain

Polished ocean jasper (orbicular jasper)

Microcrystalline quartz (SiO₂) with chalcedony, iron oxides, and assorted silicate inclusions

Granite

Phaneritic Plutonic Igneous Rock (composed of Quartz, Feldspar, and Mica)

Pebble

Clast (specifically a granule or small pebble)

Turquoise

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

Granite (Weathered River Rock)

Plutonic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Weathered sandstone or iron-stained siltstone

Quartz-rich clastic sedimentary rock, likely ferruginous sandstone

Sandstone

Clastic sedimentary rock (quartz arenite)

Metallic Ornament / Jewelry

N/A - This is an artificial object, not a geological specimen.

Iron-Stained Quartz (Red/Hematoid Quartz)

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Asphalt (Road Aggregate)

Bituminous conglomerate

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Tumbled blue-green chrysocolla (likely chrysocolla with quartz)

Chrysocolla, hydrated copper aluminum silicate; commonly intergrown with quartz, Cu₂H₂Si₂O₅(OH)₄

Granite pebble

Granite; chiefly quartz, potassium feldspar, plagioclase, and minor biotite/hornblende

Snowflake Obsidian

Volcanic Glass (SiO2 with Cristobalite inclusions)