Mineral Specimen

Possible weathered metallic mineral specimen

Uncertain; possibly native copper-bearing rock or iron sulfide in a gray host matrix

Chrysocolla-bearing copper mineral specimen

Chrysocolla, hydrated copper aluminosilicate (approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O), possibly mixed with malachite

Unidentified polished green mineral specimen

Possibly aventurine quartz or serpentine; image insufficient for definitive identification

Unidentified polished stone or mineral specimen

Indeterminate from the blurred photograph; possibly a polished pale chalcedony, quartz, or feldspar piece

Carved white translucent mineral specimen

Likely calcite (CaCO₃), possibly milky quartz (SiO₂)

Mixed landscaping gravel and mineral specimens

Mixed silicate and carbonate rocks; likely quartz, chert, jasper, basalt, granite, and limestone

Blue glassy fragment among beach gravel

Likely cobalt-blue man-made glass; not a natural mineral specimen

Quartz (Variety of Rough Mineral Specimens)

Silicon Dioxide (SiO2)

Mixed sedimentary rock and mineral specimens

Predominantly limestone, chert, sandstone, and iron-oxide-bearing clasts; exact identification requires testing

Unidentified light-colored rock or mineral specimen

Indeterminate; possibly weathered calcite-rich material, limestone, or pale quartz-bearing rock

Quartz–calcite sulfide-bearing mineral specimen

Quartz (SiO₂) with likely calcite (CaCO₃) and iron sulfides, possibly pyrite (FeS₂); exact species requires testing

Likely rough quartz-bearing mineral specimen

Quartz (silicon dioxide, SiO₂), possibly iron-stained quartz or quartz-rich rock

Tumbled or cut iron-rich mineral specimen

Likely limonite/goethite (hydrated iron oxides), possibly weathered hematite

Likely polished dark metallic mineral specimen

Indeterminate from image; possibly hematite, magnetite, or galena

Possibly tumbled dark stone or mineral specimen

Indeterminate from image; possibly black tourmaline, basalt, or another dark silicate

Mixed Mineral Assortment (Pyrite, Kyanite, Agate, Jasper)

FeS2 (Pyrite), Al2SiO5 (Kyanite), SiO2 (Agate/Jasper)

Banded calcite/aragonite mineral specimen (tentative)

Calcite (CaCO₃), possibly with aragonite or crystalline carbonate growth

Unidentified pale pink rough mineral specimen

Possibly rose quartz or feldspar; identification is uncertain from the photograph

Likely tumbled pale-green mineral specimen

Indeterminate; possibly serpentine, calcite, or pale jade/nephrite

Polished chrysocolla-bearing copper mineral specimen

Chrysocolla, Cu₂H₂Si₂O₅(OH)₄·nH₂O, likely mixed with malachite and limonite/goethite

Tumbled amber-colored glassy mineral specimens

Likely citrine or yellow chalcedony; exact identification is uncertain from the photograph

Tumbled Mineral Collection (Amethyst, Celestite, K2 Jasper, Rose Quartz, Ruby in Zoisite, Que Sera Stone)

Mixed Mineral Specimens (Quartz SiO2, Celestite SrSO4, Corundum Al2O3 with Zoisite, etc.)

Possible pink calcite or quartz-rich mineral specimen

Tentatively calcite (CaCO₃), possibly with iron-oxide staining; identification is uncertain from the image

Raw greenish-blue quartz-bearing mineral specimen

Likely fluorite or chalcedony/quartz; exact identification requires hardness and crystal tests

Unidentified dark reddish-brown rock or mineral specimen

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

Mixed polished and tumbled mineral specimens, prominently amethyst

Amethyst: purple quartz, SiO₂; accompanying pieces may include jasper, agate, aventurine, tiger’s eye, and other lapidary stones

Quartz-bearing rock or quartz-rich mineral specimen

Quartz, silicon dioxide (SiO₂); exact host rock is uncertain from the image

Iron-rich rock or weathered metallic mineral specimen

Uncertain; possibly limonite/goethite with iron oxides, or a metallic sulfide such as pyrite/chalcopyrite

Mixed tumbled stones

Mixed mineral specimens; visible pieces may include quartz, feldspar, calcite, and other silicates

Quartz-rich stone tool or shaped mineral specimen

Likely milky quartz or quartzite (SiO₂); exact material cannot be confirmed from the image

Blue-green fluorite or copper-bearing mineral specimen

Fluorite (CaF₂), tentatively; blue-green coloration may indicate trace copper or other impurities

Native copper (probable copper-rich mineral specimen)

Copper, Cu; possibly mixed with cuprite, malachite, and iron-oxide alteration minerals

Hematite

Iron(III) oxide (Fe2O3)

Sea stacks and coastal cliffs

Likely basaltic sea stacks (rock type cannot be confirmed from the image)

Asphalt (Bituminous Concrete)

Bituminous Concrete / Pavement

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

Translucent yellow-orange mineral specimen, possibly amber or citrine

Uncertain; amber is fossilized tree resin (organic), while citrine is quartz, SiO₂

Likely weathered brown rock or iron-rich mineral specimen

Indeterminate from image; possible limonite/goethite-rich material

Shark Tooth Fossil

Carcharodonta (order Lamniformes), likely Carcharias spp.

Greenish translucent glassy mineral specimen, possibly fluorite or quartz

Likely fluorite (CaF₂) or green quartz (SiO₂); exact identification requires hardness and cleavage tests

Granite

Felsic intrusive igneous rock

Fossil gastropod shell

Gastropoda; species cannot be determined from the image