Indeterminate

Likely weathered brown rock fragment

Indeterminate; possibly basaltic or iron-stained mafic rock

Unidentified weathered rock, possibly quartz-bearing granite or rhyolite

Indeterminate; likely quartz–feldspar-rich silicate rock

Fossil shell fragment (likely brachiopod or bivalve)

Indeterminate fossilized carbonate shell; likely Brachiopoda or Bivalvia

Decorative natural-stone tile assortment, likely marble and breccia

Calcite-rich marble and polymict carbonate breccia; exact varieties cannot be confirmed from the image

Rounded quartz-rich pebble

Likely quartzite or quartz-rich sandstone; composition predominantly SiO₂

Quartz-rich sandstone or quartzite

Quartzite (mostly microcrystalline SiO₂), possibly silicified sandstone

Tumbled cream-colored stone, likely milky quartz

Quartz (SiO₂), probably massive/milky quartz

Vesicular basalt pebble

Basalt, typically plagioclase–pyroxene–olivine with secondary iron oxides

Iron-stained quartzite or quartz-rich rock fragment

Quartzite; predominantly silicon dioxide (SiO₂), with iron-oxide staining

Polished jasper or chert pebble

Microcrystalline quartz (SiO₂), likely iron- and clay-rich jasper/chert

Likely fossilized shell or shell-bearing limestone

Indeterminate fossiliferous carbonate; possibly a brachiopod or bivalve in limestone

Weathered, iron-stained rock pebble

Indeterminate; possibly iron-oxide-cemented sandstone or laterite

Unidentified gray-green stone

Indeterminate; the specimen is too blurred and obscured for reliable identification

Weathered rock fragment (possibly sandstone)

Indeterminate; likely iron-stained, quartz-rich sandstone

Fossil shark tooth

Fossilized shark tooth; species indeterminate from the image

Weathered quartz-rich rock, likely granite or gneiss

Indeterminate granitic rock; mainly quartz, feldspar, and mica

Unidentified polished mineral specimen

Indeterminate; likely a pale feldspar or quartz-bearing material

Small rounded pebble, possibly quartz-rich stone

Indeterminate; likely quartz/quartzite or a weathered feldspathic pebble

Small rounded pebble, likely quartz-rich sandstone or granitic fragment

Indeterminate lithic clast; possible quartz–feldspar aggregate

Ammonite fossil

Ammonoidea (coiled cephalopod fossil; exact genus indeterminate)

Likely tumbled brown stone

Indeterminate; possibly jasper, chert, or iron-stained quartzite

Rounded brown river pebble

Indeterminate; likely weathered sandstone or iron-stained quartzite

Unidentifiable embedded dark fragment

Indeterminate; possibly a dark silicate mineral or lithic inclusion

Likely weathered iron-rich rock fragment

Indeterminate; possibly limonite/goethite-bearing sandstone or ironstone

Fossilized bone fragment (probable vertebrate bone)

Permineralized bone; exact taxon indeterminate from the image

Likely iron-rich river cobble (weathered basalt or ironstone)

Indeterminate; possibly weathered basalt, with hematite/goethite staining

Fossil shell fragment, likely bivalve or brachiopod

Indeterminate fossilized mollusk/brachiopod; commonly calcite (CaCO₃)

Small rough mineral/rock fragment

Indeterminate; possibly quartz-bearing rock or weathered feldspar

Small rounded brown stone, likely weathered iron-rich rock

Indeterminate; possibly ferruginous sandstone, ironstone, or weathered basalt

Weathered sedimentary rock, possibly sandstone

Indeterminate clastic sediment; probable quartz-rich sandstone

Weathered brown rock fragment

Indeterminate; possibly iron-stained sandstone or weathered limestone

Small gray metallic-looking rock

Indeterminate; possibly galena-bearing ore or metallic sulfide

Likely tumbled brown mineral fragment

Indeterminate; possibly iron-stained quartz, jasper, or carnelian

Unidentified metallic mineral fragment

Indeterminate; possibly galena, hematite, or a metallic meteorite fragment

Orbicular/porphyritic stone, likely weathered igneous rock

Indeterminate; possibly orbicular granite or a weathered felsic porphyry

Tumbled blue-gray stone, likely marble or quartzite

Indeterminate; probably calcite marble (CaCO₃) or quartzite (SiO₂)

Tumbled brown stone, possibly chert or iron-stained quartzite

Indeterminate from photograph; possible microcrystalline quartz (SiO₂)

Polished dark river pebble

Indeterminate; likely basalt or fine-grained mafic rock

Fossil coral or shell fragment

Indeterminate calcareous fossil; likely aragonite or calcite (CaCO₃)

Likely weathered quartz-bearing rock fragment

Indeterminate; possibly granitic or metamorphic quartz–feldspar aggregate

Weathered iron-rich rock fragment

Indeterminate; likely limonite/goethite-bearing sandstone or laterite

Rounded weathered stone, likely sandstone or iron-stained quartzite

Indeterminate; probable quartz-rich sandstone (SiO₂-dominant)