Agate Geode
Silicon Dioxide (Chalcedony/Quartz), SiO2
sedimentary
Category
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Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2)
mineral
Grey River Stone (Gneiss/Schist mix)
Foliated Metamorphic Rock (variable mineral formula)
metamorphic
Uncertain fine-grained rock or mineral-bearing specimen
Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Man-made earbud charging case (Not a rock or mineral)
Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components
Synthetic/Man-made object
Quartz Geode (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Likely weathered quartz-rich rock or mineral fragment
Indeterminate from image; possibly quartz-bearing pegmatite or iron-stained quartz
mineral
Sandstone
Quartz Sandstone (predominantly)
Sedimentary
Druzy Quartz Geode (with Chalcedony)
Silicon Dioxide (SiO2)
mineral
Orbicular Gabbro
Orbicular Gabbro
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Porphyry
Porphyritic Igneous Rock
igneous
Jasper and Quartz Breccia
Silicified Breccia / Microcrystalline Quartz
sedimentary
Granite
Granite
igneous
Likely weathered iron-rich rock or mineral fragment
Indeterminate; possibly limonite/goethite-rich material with quartz or feldspar
mineral
Unidentified dark reddish-brown rock or mineral specimen
Indeterminate from the blurred image; possibly iron-stained quartz, jasper, or a metallic sulfide-bearing rock
mineral
Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)
Silicified limestone or banded sedimentary rock with mineral veins
sedimentary
Granite (Leucogranite)
Felsic Plutonic Rock (Granite)
igneous
Quartz-Veined Gneiss or Metamorphic Rock with Quartz Veins
Quartz-veined metamorphic rock (Silicate mineral assemblage)
metamorphic
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)
igneous
Gold (Elemental Metal)
Gold (Au)
Mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Carnelian (Red Chalcedony)
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
mineral
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Jasper in Basalt Matrix
Silicon Dioxide (SiO2) with impurities; Chalcedony
sedimentary (secondary mineral) within igneous
Popcorn
Zea mays everta (P. Wilson) (Botanical name for the corn variety)
Organic/Biogenic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of iron oxide)
metamorphic
Serpentinite
Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)
metamorphic
The user-provided image does not contain a rock or mineral specimen
N/A
Blue Chalcedony
Microcrystalline Quartz (SiO2)
mineral
Fossilized stromatolite or laminated microbial mat
Layered carbonate/chert fossil; exact taxon indeterminate from the image
fossil
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Basalt
Mafic volcanic rock (Primary minerals: Plagioclase feldspar, Pyroxene)
igneous
Note: Item is not a geological specimen
Homo sapiens (Dermal Appendage: Pilus)
Organic / Biological
Peridotite Nodules in Basalt (Olivine Xenolith)
Mantle Peridotite / Olivine ((Mg, Fe)2SiO4) in Basalt
igneous
Schist
Schist (metamorphic rock)
metamorphic
Anthropogenic Heat Source (Electronic/Industrial Interface)
Thermal IR emission (Electronic infrastructure)
not a rock or mineral
Quartz-veined Basalt or Limestone Pebble
Quartz vein in host rock (Silicate mineral in carbonate or volcanic matrix)
sedimentary