Undetermined

Unknown Rock Fragment

Undetermined

Unidentifiable Specimen

Undetermined

Possible iron-rich pebble with a weathered inclusion

Unidentified; image alone does not support a reliable mineral or rock identification

Unidentified small mineral or rock fragment

Not identifiable from the image; the fragment may be a common silicate or other mineral grain.

Uncertain small stone; possibly weathered quartz-bearing rock

Indeterminate from image; candidate materials include quartz-rich pebble or altered silicate rock

Generic Rock Sample

Undetermined geological specimen

White tumbled stone, likely quartz or calcite

Indeterminate; possibly quartz (SiO₂) or calcite (CaCO₃)

Unidentified small mineral specimen

Undetermined from the image

Generic Rock / Pebble

Undetermined rock specimen

Weathered pebble, possibly quartz-rich river stone

Unidentified silicate rock; composition cannot be determined reliably from the image

Fossil oyster shell

Fossilized bivalve mollusk shell; exact species and age cannot be determined from the image

Unidentified dark pebble

Undetermined; possibly polished basalt, chert, or iron-rich stone

Small unidentified mineral specimen

Indeterminate from image; possibly a quartz-family crystal or sulfide mineral

Tiny amber-colored crystal or mineral fragment

Indeterminate from image; possibly quartz, citrine, topaz, or iron-stained feldspar

Unidentified metallic mineral fragment

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

Small metallic mineral fragment

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

Possibly garnet-bearing rock fragment

Unidentified reddish-brown mineral or rock; the image is insufficient for a reliable species identification.

Small rounded pebble

Unidentified lithic pebble; composition cannot be determined from the image

Reddish-brown tumbled stone, possibly jasper

Unidentified iron-oxide-stained silicate; exact material cannot be determined from the image

Unidentified metallic-looking mineral fragment

Indeterminate; possible galena, magnetite, or metal-rich sulfide/ore fragment

Unidentified dark rock fragment

Likely fine-grained mafic mineral aggregate; exact identification requires testing

Likely weathered iron-rich rock fragment

Indeterminate; possibly limonite/goethite-bearing sandstone or ironstone

Likely polished black-and-white stone fragment

Indeterminate from image; possibly tourmalinated quartz, black-and-white jasper, or coated stone

Weathered geode or vug-bearing rock

Likely a quartz- or calcite-lined geode/vug in a host rock; exact minerals cannot be confirmed from the image

Small dark pebble, likely a fine-grained metamorphic rock

Undetermined; possibly slate or amphibolite

Small brown pebble, possibly chert or iron-stained quartz

Undetermined; visual identification is inconclusive

Small dark pebble, likely fine-grained sedimentary rock

Undetermined; possibly siltstone or mudstone

Dark, rounded rock (possibly basalt)

Undetermined; basalt is a tentative visual identification

Brown faceted gemstone, possibly smoky quartz

Undetermined; smoky quartz is SiO₂

Weathered gray stone fragment

Undetermined; possibly limestone or sandstone

Gray rock (possibly basalt or fine-grained granite)

Undetermined; no diagnostic minerals are visible

Unidentified small tan stone

Likely quartz-rich pebble; exact identification is impossible from the image alone

Iron-rich reddish rock, possibly weathered basalt or ironstone

Indeterminate; likely oxidized mafic rock containing iron oxides and silicate minerals

Uncertain dark-and-white rock fragment

Likely a mixed lithic specimen, possibly quartz-bearing granite or ore; exact identification is not possible from the photograph

Unknown dark mineral fragment

Indeterminate; possibly a dark silicate mineral or slag-like geological fragment

Weathered brown rock fragment

Indeterminate; possibly weathered granite, gneiss, or iron-stained quartz-rich rock

Rounded greenish pebble

Indeterminate; likely weathered quartzite, greenstone, or altered volcanic rock

Unidentified brown rock fragment

Indeterminate from image; likely a weathered iron-rich lithic fragment

Uncertain fine-grained rock or mineral-bearing specimen

Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains

Blue-gray mineral/rock fragment

Indeterminate; possibly azurite-bearing material, blue chalcedony, or dyed/coated stone

Dark mineral-rich rock fragment

Indeterminate; possibly dark quartzite, chert, or weathered igneous rock

Unidentified Small Rock

Unknown