This Is Not A Rock Or Mineral

Banded Iron Formation (Fragment)

Banded Iron Formation (BIF)

Mixed rock and mineral specimens

Predominantly quartz-rich rocks, with a possible malachite-bearing specimen; exact identification is uncertain from the image

Mixed rock and mineral collection

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

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 specimen collection

Mostly undetermined from the photograph; apparent quartz-rich rocks, sandstone, granite/gneiss, and possibly iron-oxide-bearing specimens

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

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

Mixed rock and mineral gravel

Predominantly granite/granodiorite, basaltic rocks, quartz, and possible gneiss; exact identification is uncertain from the image

Mixed rock and mineral collection

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

Mixed river-worn rock and mineral collection

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

Likely quartz-rich rock or mineral fragment

Quartz (SiO₂), possibly in a pegmatitic or granitic matrix

Mixed rounded rock and mineral gravel

Predominantly weathered basalt, quartz-rich fragments, and iron-stained silicate rocks; exact species cannot be determined reliably from the image

Unknown Rock Fragment

Unknown

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

Anhydrite (Calcium Sulfate, CaSO4)

Metallic Ornament / Jewelry

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

Pink Granite (Alkali-feldspar Granite)

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

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.

Granodiorite

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

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

Moqui Marble

Hematite-Goethite Concretion

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

Polyester (Polyethylene terephthalate) / Faux Fur

Aura Quartz (Anomalously Coated Quartz)

Silicon Dioxide (SiO2) treated with vaporized metals

Likely weathered granite or granitic gneiss fragment

Granite: quartz + feldspar + mica; possibly gneiss if foliation is confirmed

Banded Sedimentary Rock

Sedimentary rock with mineral veins/banding

Copper Ore

Cupriferous Rock / Mixed Mineral Matrix

Biotite Schist (likely)

Biotite Schist (rock), Biotite (mineral)

Basalt with Xenolith

Extrusive Igneous Rock containing Mantle Xenolith

Unidentifiable Specimen

Undetermined

Quartzite with Iron Staining

Metamorphic Quartz Sandstone

Dark mafic metamorphic rock, likely amphibolite

Amphibolite; chiefly hornblende amphibole and plagioclase feldspar

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

Graphic Granite (or Rapakivi-textured Granite)

Alkali feldspar granite

Jasper and Chalcedony Nodule

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Leopard Jasper

Microcrystalline Quartz (SiO2) with mineral inclusions

Quartz Geode

Silicon Dioxide (SiO2)

Dendritic Jasper

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions