Not A Rock Or Mineral

Red weathered granite boulder

Granite, a coarse-grained felsic intrusive igneous rock

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)

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)

Fossilized stromatolite or laminated microbial mat

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

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)

Blue opalescent glass-like gemstone (possibly imitation opalite)

Likely man-made opalite glass; composition varies, typically silica-based glass

Possible iron-rich pebble with a weathered inclusion

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

Jasper in Basalt Matrix

Silicon Dioxide (SiO2) with impurities; Chalcedony

Biotite-bearing granite or granitic gneiss

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

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)

Small tan stone (undetermined)

Unidentified fine-grained geological material; species cannot be determined from the image

Blue Chalcedony

Microcrystalline Quartz (SiO2)

Small dark stone (unidentified)

Undetermined; image lacks enough detail for reliable identification

Green stone fragment (unidentified)

Undetermined; possibly serpentine or greenstone, but the image is insufficient for identification

Likely quartz-rich rock fragment

Indeterminate; possibly quartz-bearing granite or quartzite

Popcorn

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

Small pale stone (unidentified)

Undetermined; image detail is insufficient for reliable identification

Anthropogenic Heat Source (Electronic/Industrial Interface)

Thermal IR emission (Electronic infrastructure)

Biotite-rich schist

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

Note: Item is not a geological specimen

Homo sapiens (Dermal Appendage: Pilus)

Small pale stone fragment (undetermined)

Unidentified; the image lacks diagnostic detail for a reliable identification

Sandstone

Quartz Sandstone (predominantly)

Small tan rock fragment

Unidentifiable lithic fragment; mineral composition undetermined

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

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

Basalt

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

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

Likely raw mica-bearing metamorphic rock or mineral fragment

Tentatively biotite schist; visually similar dark mica-rich material

Unidentified gray rock fragment

Indeterminate from image; possibly quartz- or feldspar-rich silicate material

Unidentified dark stone fragment

Indeterminate from the image; possibly a dark mafic rock or black mineral

Chipped Glass/Plastic Fragment

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

Unidentified gray metallic object

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

Peridotite Nodules in Basalt (Olivine Xenolith)

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

Schist

Schist (metamorphic rock)

Granite

Granite

N/A (Non-Geological Object)

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

Digital Data Visualization (Bar Chart)

Small rough mineral/rock fragment

Unidentified; image detail is insufficient for a reliable species identification