Not A Rock Or Mineral

Metallic Ornament / Jewelry

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

Red coral chip bracelet

Corallium spp.; skeleton composed primarily of calcium carbonate (aragonite)

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)

Quartz Breccia

Brecciated Quartz

Mica-rich granite (likely biotite granite)

Granite, composed chiefly of quartz, feldspar, and mica (commonly biotite); exact minerals are uncertain from the image.

Moqui Marble

Hematite-Goethite Concretion

Conglomerate

Clastic sedimentary rock

Small rock fragment (unidentified)

Undetermined; the image does not show enough detail for reliable identification

Weathered stone nodule or concretion

Unidentified lithic concretion; composition cannot be determined from the image

Likely mica-rich metamorphic rock (schist)

Mica schist, probably containing muscovite and/or biotite with quartz and feldspar

Small pink mineral fragment

Indeterminate; possibly rose quartz or feldspar

Liesegang Banded Sandstone

Quartz arenite with Liesegang banding

Basalt with Xenolith

Extrusive Igneous Rock containing Mantle Xenolith

Basalt with Granite Vein

Igneous intrusion (felsic vein in mafic host rock)

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

Anthropogenic textile material

Aura Quartz (Anomalously Coated Quartz)

Silicon Dioxide (SiO2) treated with vaporized metals

Banded Sedimentary Rock

Sedimentary rock with mineral veins/banding

Copper Ore

Cupriferous Rock / Mixed Mineral Matrix

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

Polyester (Polyethylene terephthalate) / Faux Fur

Biotite Schist (likely)

Biotite Schist (rock), Biotite (mineral)

Basalt with Quartzite

Mafic extrusive igneous rock in contact with quartz-rich metamorphic host rock

Quartzite with Iron Staining

Metamorphic Quartz Sandstone

Likely olivine (peridot)

Olivine-group silicate, approximately (Mg,Fe)₂SiO₄

Tumbled labradorite

Labradorite, a calcium-sodium plagioclase feldspar, approximately (Ca,Na)(Al,Si)₄O₈

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

Pink Granite (Alkali-feldspar Granite)

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

Marine gastropod shell

Calcareous mollusk shell, primarily aragonite (CaCO₃), likely a whelk or conch

Pink granite

Granite, chiefly quartz–alkali feldspar–plagioclase with biotite/hornblende

Conglomerate

Clastic conglomerate (rounded pebble- to cobble-sized clasts in a finer matrix)

Biotite-bearing granite (likely granodiorite)

Coarse-grained granitoid, composed mainly of quartz and feldspar with dark biotite or hornblende

Tumbled granite

Granite, a coarse-grained felsic intrusive igneous rock

Unidentified light-colored rock or mineral specimen

Indeterminate; possibly weathered calcite-rich material, limestone, or pale quartz-bearing rock

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

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.