Indeterminate

Rounded quartz-rich pebble, possibly milky quartz

Quartz (SiO₂), provisional identification

Weathered iron-rich rock fragment

Likely limonite/goethite-bearing material; exact identification requires testing

Fossil shell fragment

Likely a fossilized brachiopod or bivalve; exact taxon cannot be determined from the image

Faceted clear gemstone, likely glass imitation or cubic zirconia

Uncertain; possibilities include cubic zirconia (zirconium dioxide, ZrO₂), quartz (SiO₂), or lead glass

Tumbled dark stone, possibly hematite or polished basalt

Uncertain; likely hematite (Fe₂O₃) or a polished mafic rock

Fossiliferous limestone with a fossil sea urchin

Bioclastic limestone containing an echinoid fossil (class Echinoidea)

Blue-gray quartz-rich rock, likely sodalite-bearing syenite or granite

Probable sodalite-bearing nepheline syenite; composition may include quartz, feldspar, sodalite, and dark mafic minerals

Blue-green slag glass or chalcedony-like material

Likely industrial glassy slag; exact identification requires testing

Likely tumbled quartz or feldspar pebble

Indeterminate; possibly quartz (SiO₂) or potassium feldspar (KAlSi₃O₈)

Quartz-rich sandstone or quartzite fragment

Quartz (SiO₂) with iron-oxide staining; possibly weakly metamorphosed quartzite

Rounded iron-rich stone, likely hematite-bearing sandstone or ironstone

Hematite/goethite-bearing ferruginous sandstone or ironstone; composition cannot be confirmed from appearance alone

Fossilized bivalve shell fragment

Calcitic mollusk shell, commonly Bivalvia; exact genus cannot be determined from the image

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Tumbled quartz pebble with iron-oxide inclusions

Quartz (SiO₂), stained by hematite/goethite

Orange mineral fragment, possibly iron oxide or carnelian

Uncertain; candidates include hematite/goethite (Fe₂O₃/FeO(OH)) or orange chalcedony (SiO₂)

Fossilized bone fragment (probable large mammal limb bone)

Mineral-replaced or permineralized bone; exact taxon cannot be determined from the image

Dyed red crystal aggregate, likely quartz or salt

Uncertain; possibly dyed quartz (SiO₂) or halite (NaCl)

Likely weathered sandstone or iron-rich limestone

Indeterminate clastic carbonate rock; apparent iron-oxide staining (goethite/hematite)

Reddish sandstone or iron-stained quartzite pebble

Likely ferruginous sandstone; possibly quartzite, composed mainly of quartz (SiO₂) with iron oxides

Rounded brown pebble, likely quartz-rich sandstone or weathered quartzite

Indeterminate; probable quartz (SiO₂)-rich sandstone/quartzite with iron-oxide staining

Fine-grained gray sandstone or quartz-rich sedimentary pebble

Likely quartz arenite or lithic sandstone; exact identification requires microscopy or testing

Fossil shell fragment, likely brachiopod or bivalve

Indeterminate bioclast; possible Brachiopoda or Mollusca

Rounded pale pebble, likely quartz-rich rock

Indeterminate; possibly quartzite or weathered limestone

Rounded brown cobble, likely weathered sandstone or iron-rich sedimentary rock

Indeterminate; possibly ferruginous sandstone or ironstone

Fossilized shell or bone fragment

Indeterminate biogenic calcite or apatite fossil

Weathered brown quartz-rich rock, likely sandstone

Quartz-rich sandstone (indeterminate lithology)

Polished black mineral or volcanic glass fragment

Indeterminate; possibly obsidian or black tourmaline

Tumbled brown stone, likely quartzite or jasper

Indeterminate; probable quartz-rich aggregate (SiO₂), possibly brown jasper

Iridescent polished/tumbled stone (likely coated quartz or glassy synthetic material)

Indeterminate; possibly quartz (SiO₂) with an artificial iridescent coating

Iron-rich sandstone or lateritic pebble

Ferruginous sandstone; chiefly quartz (SiO₂) cemented by iron oxides such as hematite/goethite

Quartz-rich breccia or silicified rock

Microcrystalline quartz (SiO₂), with iron-oxide staining and possible feldspar/calcite fragments

Quartz-bearing dark mineral specimen

Quartz (SiO₂) on a dark host rock, possibly basalt or sulfide-rich ore

Tumbled beige stone, possibly quartz or calcite

Indeterminate from photograph; likely microcrystalline quartz (SiO₂) or calcite (CaCO₃)

Slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Indeterminate metallic mineral fragments

Possibly pyrite, chalcopyrite, or metallic sulfide-bearing rock

Rounded sandstone pebble

Quartz-rich sandstone, likely arkose or lithic sandstone

Iron-rich rock, possibly limonite/goethite

Hydrated iron oxides/hydroxides, commonly limonite (FeO(OH)·nH₂O) with goethite (α-FeO(OH))

Likely blue calcite or aragonite fragment

Calcite (CaCO₃), possibly aragonite (CaCO₃)

Clear Quartz Sphere

Silicon Dioxide (SiO2)

Weathered quartz-rich pebble (tentative)

Likely quartz/chalcedony, SiO₂, possibly iron-stained

Iron-rich slag or limonite-bearing rock

Hydrated iron oxides, chiefly limonite/goethite (FeO(OH)·nH₂O); possibly industrial iron slag

Rounded quartz-rich pebble, likely sandstone or granitic-derived pebble

Indeterminate clastic rock; likely quartz-rich sandstone/conglomerate clast