Anthropogenic Specimen (Man Made)

Chert Pebble/Nodule

Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)

N/A

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various metal oxide impurities

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Obsidian

Obsidian (volcanic glass, amorphous silica rich rock)

BROWN GRANITE (likely 'Tan Brown' or similar)

Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)

Unable to Identify (Image Obscured)

United States Quarter Dollar

Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert

Chert (microcrystalline quartz)

Limonitic Sandstone with Inclusion

Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)

Fossilized Bivalve Shell

Bivalvia (fossil specimen)

Goldstone

Not a natural mineral or rock. It is an ornamental glass.

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Marble

Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)

Geodal Limestone / Calcite Druze

Calcium Carbonate (CaCO3)

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Gold Ore in Quartz

Auriferous Quartz (Au + SiO2)

Pegmatite with Schorl (Black Tourmaline) and Mica

Pegmatite (complex association of NaAlSi3O8, NaFe3Al6(BO3)3Si6O18(OH)4, and KAl2(AlSi3O10)(OH,F)2)

Cullet Glass (Industrial Slag Glass)

Amorphous Silica (SiO2) with metallic oxide impurities

Serpentinite

Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)

Note: No specimen visible

Echinoidea (Fossil Sea Urchin)

Echinodermata Echinoidea

Quartz Vein in Schist

Quartz (SiO2) in Mica Schist

Unable to identify - Image contains non-geological items

Note: Item is not a geological specimen

n/a

River Pebble (Likely Quartzite or Chalcedony)

Silicon Dioxide (SiO2) - granular metamorphic variety

Quartz Geode with Calcite

Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)

Jade (likely Nephrite Jade based on appearance)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Human Skin (Epidermis/Dermis)

Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)

Obsidian

Obsidian (volcanic glass)

South Korean 100 Won Coin (Cupronickel)

Cupronickel Alloy (75% Cu, 25% Ni)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Spinosaurus Tooth Fossil

Spinosaurus aegyptiacus (Calcium Phosphate/Apatite)

Quartz Vein in River Siltstone

Crystalline Quartz (SiO2) in Siliclastic Matrix

Milky Quartz with Inclusions

Silicon Dioxide (SiO2)

Lemon (Mock specimen mimicking Citrine/Sulfur)

Citrus x limon

Diamond inlaid in Jewelry

Carbon (C)

Chert (Jasper Variant likely)

Silicon Dioxide (SiO2)

Fossiliferous Limestone

Limestone (composed primarily of calcite with included fossils CaCO3)

Ruby in Fuchsite (often confused with Ruby in Zoisite)

Corundum (Al2O3) in Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2)