This Is Not A Rock Or Mineral

Likely weathered quartz-rich rock or mineral fragment

Indeterminate from image; possibly quartz-bearing pegmatite or iron-stained quartz

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

Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components

Granite (Leucogranite)

Felsic Plutonic Rock (Granite)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Petrified Wood

Silicified Wood (SiO2)

Weathered feldspar-rich pegmatite or granite outcrop

Quartz–feldspar granitoid, likely containing potassium feldspar (KAlSi₃O₈) and quartz (SiO₂)

Dark mafic metamorphic rock, likely amphibolite

Amphibolite; chiefly hornblende amphibole and plagioclase feldspar

Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)

Silicified limestone or banded sedimentary rock with mineral veins

Quartz-Veined Gneiss or Metamorphic Rock with Quartz Veins

Quartz-veined metamorphic rock (Silicate mineral assemblage)

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Carnelian (Red Chalcedony)

SiO2 (Silicon Dioxide with Iron Oxide inclusions)

Banded Iron Formation

Banded Iron Formation (BIF)

Jasper in Basalt Matrix

Silicon Dioxide (SiO2) with impurities; Chalcedony

Tumbled basalt (likely vesicular basalt)

Basalt; primarily plagioclase, clinopyroxene, and olivine, with iron oxides

Likely weathered iron-rich rock or mineral fragment

Indeterminate; possibly limonite/goethite-rich material with quartz or feldspar

Biotite-bearing granite or granitic gneiss

Quartz–feldspar–biotite assemblage; likely granite (possibly weakly metamorphosed gneiss)

Unidentified dark reddish-brown rock or mineral specimen

Indeterminate from the blurred image; possibly iron-stained quartz, jasper, or a metallic sulfide-bearing rock

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of iron oxide)

Serpentinite

Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)

Blue Chalcedony

Microcrystalline Quartz (SiO2)

Popcorn

Zea mays everta (P. Wilson) (Botanical name for the corn variety)

Biotite-rich schist

Mica schist, chiefly quartz + biotite mica (variable feldspar and garnet)

Sandstone

Quartz Sandstone (predominantly)

Fossilized stromatolite or laminated microbial mat

Layered carbonate/chert fossil; exact taxon indeterminate from the image

Blue-gray stone pebble (possibly slag or a weathered rock)

Unidentified fine-grained rock; composition cannot be determined from the image

Chipped Glass/Plastic Fragment

Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic

Basalt

Mafic volcanic rock (Primary minerals: Plagioclase feldspar, Pyroxene)

The user-provided image does not contain a rock or mineral specimen

Small tan rock fragment

Unidentifiable lithic fragment; mineral composition undetermined

Peridotite Nodules in Basalt (Olivine Xenolith)

Mantle Peridotite / Olivine ((Mg, Fe)2SiO4) in Basalt

Granite

Granite

Anthropogenic Heat Source (Electronic/Industrial Interface)

Thermal IR emission (Electronic infrastructure)

Note: Item is not a geological specimen

Homo sapiens (Dermal Appendage: Pilus)

Schist

Schist (metamorphic rock)

Gold (Elemental Metal)

Gold (Au)

N/A (This is a digital image of a bar graph)

Digital Data Visualization (Bar Chart)

Unidentified gray metallic object

Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material

Polished labradorite cabochon

Labradorite, calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

Likely raw mica-bearing metamorphic rock or mineral fragment

Tentatively biotite schist; visually similar dark mica-rich material

Quartz-veined Basalt or Limestone Pebble

Quartz vein in host rock (Silicate mineral in carbonate or volcanic matrix)

Possible iron-rich pebble with a weathered inclusion

Unidentified; image alone does not support a reliable mineral or rock identification