Sedimentary Rock Or Mineral (Depending On Origin And Purity)

Alexandrite

Chrysoberyl (BeAl2O4 with Chromium impurities)

Ferruginous Sandstone with Quartz Inclusions

Clastic Sedimentary Rock (Iron-rich Sandstone)

Polished Stone Pendant (Identity Unclear)

Unknown (Possibly Jasper/Agate/Quartz mixture)

Fluorite on Matrix

Calcium Fluoride (CaF2)

Gold Nugget / Native Gold

Native Gold (Au)

Quartz (Druzy on Matrix)

Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3 with Chromium impurities)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Rock Specimen

Unclassified rock specimen

Dyed or treated turquoise-like tumbled stone

Likely turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O), though blue-green magnesite or howlite imitation is possible

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)

Granite

Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)

White Quartz

Silicon Dioxide (SiO2)

Pearl

Pearl; primarily aragonite (CaCO₃) in nacre

Marble

Metamorphosed Limestone (CaCO3)

Diamond (as set in a metal alloy ring)

Diamond (Pure Carbon, C)

Seashell Fragment

Calcium carbonate (CaCO3) - primarily Aragonite or Calcite

Green Turban Shell (Polished)

Turbo marmoratus (Aragonite/Calcite)

Ocean Jasper

Silicon Dioxide (SiO2) microcrystalline quartz aggregate with inclusions

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities

Tumbled turquoise-like stone

Likely turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Emerald (Faceted Gemstone)

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Small brown-gray mineral fragment

Indeterminate; possibly weathered quartz-, feldspar-, or iron-oxide-bearing rock

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Dzi Bead (Etched Chalcedony)

Cryptocrystalline Quartz (SiO2) with chemical etching

Placer Gold Nugget

Native Gold (Au)

Turquoise

Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O

Ferruginous Sandstone (Gozzan/Ironstone)

Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)

Red jasper in gray host rock (likely hematite-stained quartzite or rhyolite)

Jasper: microcrystalline quartz (SiO₂), with iron-oxide coloration; exact host uncertain from image

Diamond (Green tinted)

Carbon (C) with trace impurities or lattice defects

Ruby

Corundum (Al2O3 with Chromium traces)

Emerald (Beryl)

Be₃Al₂Si₆O₁₈ (Chromium/Vanadium-bearing Beryl)

Quartz Pebble

Silicon Dioxide (SiO2)

Marble

Metamorphic Limestone (Calcite, CaCO3)

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

Emerald

Beryl (Be3Al2Si6O18 with chromium and vanadium impurities)

Quartzite

Quartzite (SiO2)

Quartz (Chalcedony)

Silicon Dioxide (SiO2)

Note: Item is not a geological specimen

Homo sapiens (Dermal Appendage: Pilus)

Massive Quartz (Milky or Gray)

Silicon Dioxide (SiO2)

Gossanous Sandstone (likely Terrestrial)

Arenite with Iron-Oxide inclusions