Not A Rock Or Mineral

Banded Iron Formation (Fragment)

Banded Iron Formation (BIF)

Mixed rock and mineral collection

Multiple specimens; visible examples may include quartz (SiO₂), amethyst (quartz), calcite (CaCO₃), and dark mafic rocks

Mixed river-worn rock and mineral collection

Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble

Mixed Rock and Mineral Collection

Various geological specimens

Mixed Rock and Mineral Collection

Mixed Assemblage (includes Quartz, Jasper, Feldspar, and Turquoise-colored stones)

Mixed rock and mineral collection

Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials

Mixed rock and mineral specimen collection

Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks

Mixed rock and mineral collection

Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks

Unknown Rock Fragment

Unknown

General Rock and Mineral Collection (Center: Angelite / Blue Anhydrite)

Anhydrite (Calcium Sulfate, CaSO4)

Pink Granite (Alkali-feldspar Granite)

Felsic intrusive igneous rock (composition: KAlSi3O8, SiO2, NaAlSi3O8)

Granodiorite

Granodiorite (containing Quartz, Plagioclase Feldspar, Biotite, and Hornblende)

Metallic Ornament / Jewelry

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

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Green glass-like cabochon, likely synthetic glass or resin

Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin

Unable to Identify (Image Obscured)

N/A - Image does not contain a rock or mineral

Anthropogenic textile material

Man-made Synthetic Material (Not a rock or mineral)

Polyester (Polyethylene terephthalate) / Faux Fur

Unidentifiable Specimen

Undetermined

Banded Sedimentary Rock

Sedimentary rock with mineral veins/banding

Copper Ore

Cupriferous Rock / Mixed Mineral Matrix

Moqui Marble

Hematite-Goethite Concretion

Biotite Schist (likely)

Biotite Schist (rock), Biotite (mineral)

Aura Quartz (Anomalously Coated Quartz)

Silicon Dioxide (SiO2) treated with vaporized metals

Basalt with Xenolith

Extrusive Igneous Rock containing Mantle Xenolith

Quartzite with Iron Staining

Metamorphic Quartz Sandstone

Tumbled Amethyst

Quartz (Silicon Dioxide, SiO2, colored by iron impurities)

Yellow Jasper

Microcrystalline Quartz (SiO2)

Pink Mimbres Agate / Plume Agate

Silicon dioxide (SiO2) with mineral inclusions

Jasper and Epidote in Quartzite

Metamorphic rock containing microcrystalline quartz, epidote, and jasper

Man-made earbud charging case (Not a rock or mineral)

Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components

Sandstone

Quartz Sandstone (predominantly)

Grey River Stone (Gneiss/Schist mix)

Foliated Metamorphic Rock (variable mineral formula)

Graphic Granite (or Rapakivi-textured Granite)

Alkali feldspar granite

Quartz Geode

Silicon Dioxide (SiO2)

Leopard Jasper

Microcrystalline Quartz (SiO2) with mineral inclusions

Jasper and Chalcedony Nodule

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Dendritic Jasper

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Agate Geode

Silicon Dioxide (Chalcedony/Quartz), SiO2

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Amethyst

Amethyst (Silicon Dioxide - SiO2)

Granite (Leucogranite)

Felsic Plutonic Rock (Granite)