Industrial Byproduct (Anthropogenic Rock Like Material)

Quartz Vein in Siltstone

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Basalt

Basalt (Mafic volcanic rock)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Polished brecciated jasper

Jasper, an opaque microcrystalline variety of chalcedony (SiO₂), with iron-oxide staining

Tumbled black-and-white stone, likely dendritic agate or jasper

Cryptocrystalline quartz (SiO₂), possibly chalcedony with manganese-oxide dendrites

Vesicular basalt (likely weathered scoria)

Mafic volcanic rock; chiefly plagioclase, pyroxene, and often olivine, with abundant gas vesicles

Quartzite

Quartzite (SiO2)

Diamond (in jewelry setting)

Cubic Carbon (C)

Likely tumbled lepidolite-bearing mica schist

Lepidolite-rich mica schist; chiefly lepidolite/muscovite mica, quartz, and possibly feldspar

Quartz Vein in Host Rock

Hydrothermal Quartz (SiO2) in Slates/Schists

Raw green chalcedony (likely chrysoprase or prehnite)

Microcrystalline quartz, SiO₂; possible prehnite, Ca₂Al₂Si₃O₁₀(OH)₂

Quartz-bearing geode or vuggy quartz specimen

Quartz, silicon dioxide (SiO₂), possibly with chalcedony and iron-oxide staining

Bauxite

Bauxite (Al(OH)3, AlO(OH), AlOOH)

Polished banded stone, likely zebra jasper

Zebra jasper (banded microcrystalline quartz, chiefly SiO₂, with iron-oxide and carbonate impurities)

Petrified Wood

Agatized or Silicified Wood (SiO2)

Ironstone (Limonitic/Hematitic Sandstone)

Ferruginous sandstone (predominantly Fe2O3 and FeO(OH))

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Garnet Schist

Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Man-made Carved Stone (Scream Mask/Skull motif)

Carved Soapstone or Serpentine-rich rock

Basalt with Quartz/Calcite Veins

Aphanitic Mafic Igneous Rock (Hydrothermal Veined)

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Tumbled citrine or iron-stained quartz

Quartz (SiO₂), likely iron-oxide-stained or natural citrine

Pumice

Pumice (Vesicular Felsic Glass)

Fossil bivalve shell

Ribbed pectinid or related bivalve; originally calcite/aragonite (CaCO₃), likely partially mineralized

Rough Diamond

Diamond (C)

Weathered iron-rich rock, possibly limonite-bearing basalt or laterite

Indeterminate; likely Fe-oxide/hydroxide–altered mafic rock, dominated by limonite/goethite with silicate minerals

Red Jasper

Silicon Dioxide (SiO2) containing Iron Oxide inclusions

Amazonite pendant

Amazonite, a green variety of microcline feldspar (KAlSi₃O₈)

Peridotite (with Olivine)

Peridotite (dominantly (Mg, Fe)2SiO4)

Asphalt Concrete (Bituminous Concrete)

Bituminous aggregate

Small dark mineral or rock fragment

Indeterminate; possibly mica-rich schist, biotite, or a dark sulfide mineral

Polished tektite (likely indochinite)

Natural silica-rich impact glass; mainly SiO₂ with Al₂O₃, FeO, MgO, CaO, and Na₂O

Sandstone

Clastic Sedimentary Rock

Agate

Agatized Chalcedony (SiO2)

Black Tourmaline

Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)

Mixed rock collection

Labeled specimens appear to include iron-rich rock, schist, basalt, serpentinite, and shale

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Phyllite

Phyllite (regional metamorphic rock)

Rough Garnet (Almandine)

Almandine Garnet (Fe3Al2(SiO4)3)

Quartz Geode (likely within Limestone or Dolomite matrix)

Quartz (SiO₂)