Mineralogical Specimen

Pegmatite (likely Granitic Pegmatite)

Pegmatite (a coarse-grained igneous rock, often with granitic composition)

Likely iron-rich meteorite fragment

Undetermined stony-iron or iron meteorite; mineralogy may include Fe–Ni metal, troilite, and silicates

Likely weathered porphyritic igneous rock

Provisional identification: altered basaltic-andesite or rhyolite; exact mineralogy cannot be confirmed from this close, flash-lit image

Cubic Zirconia

Zirconium dioxide (ZrO2)

Possible iron-rich meteorite

Provisional: stony-iron or iron meteorite; mineralogy may include kamacite (α-Fe,Ni) and taenite (γ-Fe,Ni)

Greisen

Greisen

Granite (likely a river or beach pebble)

Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)

Banded Gneiss

Gneiss (pronounced 'nice')

Tektite (Indochinite)

Tektite (High-silica natural glass)

River Stones (Basalt and Sedimentary Rock)

Basalt (dark specimen) and Siltstone/Mudstone (reddish specimen)

Banded Sedimentary Rock

Sedimentary rock with Liesegang banding

Galena (lead ore)

Galena, PbS (lead sulfide)

Feldspar-rich igneous rock, likely granite or gneiss fragment

Granite-like quartz–feldspar rock; exact identification is uncertain from the blurred image

Fossilized Shark Tooth (Root Portion)

Selachimorpha (partial specimen)

Rock Specimen

Unclassified rock specimen

Generic Rock / Pebble

Undetermined rock specimen

N/A

Fluorescent glassy mineral specimen, possibly hyalite opal

Hyalite (hydrated amorphous silica, SiO₂·nH₂O), tentative

Raw dark metallic mineral specimen, possibly native gold-bearing quartz or sulfide ore

Uncertain from image; possible pyrite/chalcopyrite-bearing quartz or gold-bearing sulfide matrix

Unable to Identify (Image Obscured)

Quartz geode or druzy quartz specimen

Quartz, silicon dioxide (SiO₂), likely microcrystalline/drusy quartz coating a host rock

Unidentified small mineral specimen

Undetermined from the image

Fragmented Sedimentary Pebble

Clastic Sedimentary Specimen

Fossilized Bivalve Shell

Bivalvia (fossil specimen)

Vesicular volcanic rock, likely pumice or scoria

Pumice/scoria; predominantly volcanic glass with plagioclase, pyroxene, and/or olivine

Quartz geode/vug specimen

Quartz (SiO₂), likely in a weathered iron-oxide-rich host rock

Granite

Coarse-grained felsic intrusive igneous rock, typically quartz + alkali feldspar + plagioclase with biotite/hornblende

Not a geological specimen

N/A (man-made object)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Gray slate

Slate; fine-grained foliated metamorphic rock composed mainly of mica and quartz

Kidney Stone

Calcium oxalate, uric acid, struvite, or cystine

Orbicular jasper (ocean jasper)

Silicified orbicular rhyolite; predominantly microcrystalline quartz/chalcedony (SiO₂) with iron-oxide-rich inclusions

Painted River Rock

Anthropogenic-modified Siliciclastic Sedimentary Rock

Note on Image Identification: Textile

N/A (Anthropogenic material)

Quartz-rich polymict conglomerate (possibly hydrothermal breccia)

Clast-supported polymict conglomerate dominated by quartz; includes chalcedony/quartz and dark lithic clasts

Desert Rose (Gypsum Rose / Barite Rose)

Calcium Sulfate Dihydrate (CaSO4·2H2O) or Barium Sulfate (BaSO4) with Sand inclusions

Dark Igneous Rock (Likely Basalt or Diabase)

Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

Quartz with Chlorite or Epidote inclusions

Silicon Dioxide (SiO2) with inclusions

Trilobite Fossil in Limestone

Trilobita (Class), likely embedded in fossiliferous limestone (CaCO3)

Geodal Limestone / Calcite Druze

Calcium Carbonate (CaCO3)

Rounded river pebble, likely quartz-rich sandstone or fine-grained quartzite

Indeterminate quartz-rich lithic clast; likely quartz sandstone (SiO₂-rich) or quartzite

Copper Ore Specimen

Cupriferous Rock / Malachite-bearing ore