Mineralological Specimen

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Iron inclusions

Red Jasper

Quartz (Silicon Dioxide) with Iron Oxide impurities (Fe2O3)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

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)

Fossilized Shark Tooth (Root Portion)

Selachimorpha (partial specimen)

Rock Specimen

Unclassified rock specimen

Generic Rock / Pebble

Undetermined rock specimen

N/A

Feldspar-rich igneous rock, likely granite or gneiss fragment

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

Vanadinite

Vanadinite, Pb₅(VO₄)₃Cl

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

Fluorescent glassy mineral specimen, possibly hyalite opal

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

Unable to Identify (Image Obscured)

Fragmented Sedimentary Pebble

Clastic Sedimentary Specimen

Fossilized Bivalve Shell

Bivalvia (fossil specimen)

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

Biotite mica

Biotite, a potassium-rich mica in the annite–phlogopite series; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Vesicular volcanic rock, likely pumice or scoria

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

Not a geological specimen

N/A (man-made object)

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

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)

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Quartz-rich polymict conglomerate (possibly hydrothermal breccia)

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

Weathered quartz-rich rock, possibly granite or quartzite

Indeterminate; likely quartz–feldspar aggregate, potentially granitic or quartzitic material

Desert Rose (Gypsum Rose / Barite Rose)

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

Quartz with Chlorite or Epidote inclusions

Silicon Dioxide (SiO2) with inclusions

Copper Ore Specimen

Cupriferous Rock / Malachite-bearing ore

Trilobite Fossil in Limestone

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

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

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

Geodal Limestone / Calcite Druze

Calcium Carbonate (CaCO3)

Rounded greenish river pebble

Likely altered basalt or greenstone (metabasalt); exact identification requires testing