Mineralological Specimen

Likely iron meteorite fragment

Fe–Ni metallic meteorite, possibly an octahedrite (kamacite–taenite alloy)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite with Hematite staining

Metamorphic Quartzite (SiO2)

Likely a small rough mineral specimen

Unidentifiable from the image; possibly a mica-bearing rock or green mineral

Weathered schist or phyllite

Mica schist/phyllite; quartz–mica-rich foliated metamorphic rock

Dyed Tumbled Quartz (Dragon's Vein Agate/Quartz)

Silicon Dioxide (SiO2) with artificial dye

Smoky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Quartz-rich pegmatite (likely rose/iron-stained quartz)

Quartz, SiO₂, in a coarse granitic pegmatite matrix; possibly with feldspar and mica

Fossilized bivalve shell fragment

Fossil mollusk shell, likely a pectinid or related bivalve; original shell composed mainly of aragonite or calcite, now partly mineralized

Quartz Vein in Schist

Quartz (SiO2) in Mica Schist

Weathered basaltic volcanic rock

Likely vesicular basalt or basaltic-andesite; chiefly plagioclase, pyroxene, and iron-bearing minerals

Polished Unakite pebble

Unakite: pink potassium feldspar and green epidote in quartz-rich rock

Unidentified weathered rock, possibly quartz-bearing granite or rhyolite

Indeterminate; likely quartz–feldspar-rich silicate rock

Vesicular basalt (scoria-like volcanic rock)

Basalt, composed mainly of plagioclase, pyroxene, and olivine; abundant vesicles formed by trapped gas

Chert (Chalcedony)

Cryptocrystalline Quartz (SiO2)

Gold Leaf in Glass Vial

Gold (Au)

Sandstone with Quartz Vein

Arenite with SiO2 intrusion

Clear Quartz Crystal (Likely Golden Healer/Iron-Stained)

Silicon Dioxide (SiO2)

Likely calcite-rich limestone or marble

Calcite (CaCO₃); possibly recrystallized limestone (marble)

Quartz Vein in River Siltstone

Crystalline Quartz (SiO2) in Siliclastic Matrix

Biotite-bearing granite or granitic gneiss

Quartz–feldspar–biotite granite; possibly weakly foliated granitic gneiss

Vuggy Limestone

Carbonate Sedimentary Rock with Vuggy Porosity (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Shale (with Iron Staining)

Argillaceous mudstone / Shale

Chert (Arrowhead/Scraper Preform)

Silicon dioxide (SiO2)

Ironstone concretion (possibly a pyrite-bearing concretion)

Iron-oxide-cemented sedimentary concretion; exact mineral composition cannot be confirmed from the photograph

Polished rose quartz

Quartz (silicon dioxide, SiO₂), rose-colored variety

Pink halite (rock salt)

Halite (NaCl)

Exposed shoreline bedrock and sediment

Unidentified natural rock; the image does not show enough detail for a specific geological identification

Weathered limestone

Limestone, composed chiefly of calcite (CaCO₃)

Blue Grey Agate Geode

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Quartz Vein in Matrix

Silicon Dioxide (SiO2) within Rhyolitic or Granitic Matrix

Tourmaline-bearing pegmatite (likely black schorl in a pale quartz/feldspar matrix)

Schorl tourmaline, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄, with quartz and feldspar

Tumbled red jasper and blue-green turquoise (likely dyed or stabilized)

Red jasper: microcrystalline quartz, SiO₂, colored by iron oxides; turquoise: hydrated copper-aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Not a rock, mineral, or geological specimen

Chalcopyrite

CuFeS2 (Copper Iron Sulfide)

Weathered dark metamorphic rock, likely slate or phyllite

Fine-grained foliated rock, probably slate/phyllite; exact identification requires testing

Fossil scallop shell

Fossilized bivalve mollusk; likely Pectinidae or a related pectinid

Lemon (Mock specimen mimicking Citrine/Sulfur)

Citrus x limon

Uncertain polished mineral specimen

Indeterminate; possibly quartz or feldspar with iron-oxide staining

Limonitic Sandstone with Inclusion

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

Cobalt Blue Glass / Cullet Glass

Silicon dioxide (Amorphous man-made glass)