Sedimentary Or Igneous Fragment

Gravel or Crushed Stone

Fragmented Aggregate Stone

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

Indeterminate lithic clast; possible quartz–feldspar aggregate

Weathered, iron-stained rock (likely sandstone or breccia)

Indeterminate clastic sedimentary rock; possible ferruginous sandstone or weathered breccia

Quartz (likely milky or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Quartz Nodule

Silicon Dioxide (SiO2)

Quartz fragment

Silicon Dioxide (SiO2)

Small quartz crystal fragment

Quartz, SiO₂

Gravel / Small Pebble

Rock Fragment (Gravel)

Small brown mineral fragment

Unidentified; the image lacks enough detail for a reliable species-level identification

Garnet Gneiss

Garnetiferous quartzo-feldspathic gneiss

Small weathered rock fragment

Indeterminate; possibly granitic or altered feldspathic material

Foliated metamorphic cobble, likely gneiss

Biotite–quartz–feldspar gneiss (tentative)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Likely clear quartz fragment

Quartz (SiO₂)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Quartz (Milky/Crystalline fragment)

Silicon Dioxide (SiO2)

Likely quartz-bearing rock fragment

Quartz (SiO₂), possibly with iron-oxide staining or other mineral inclusions

Geode (Unopened)

Quartz/Chalcedony concretion

Small quartz-rich mineral fragment

Quartz (SiO₂), possibly milky or chalcedonic quartz

Quartz Heart or Arrowhead Shape

Silicon Dioxide (SiO2)

Quartz Geode / Druzy Quartz Node

Silicon Dioxide (SiO2)

Fossiliferous limestone, possibly a shell or bone fragment

Calcitic limestone; predominantly calcium carbonate (CaCO₃), likely calcite

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Possible magnetite fragment

Magnetite (Fe₃O₄), tentative identification

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Likely quartz-rich pebble fragment

Quartz (SiO₂), possibly milky quartz or quartzite; the photo is insufficient to distinguish them confidently

Likely milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Garnet

Garnet (X3Y2(SiO4)3)

Likely milky quartz fragment

Quartz (SiO₂)

Likely biotite-rich schist

Mica schist, composed chiefly of biotite and quartz; exact identification is uncertain from the image.

Gneissic Schist

Gneiss-schist (Metamorphic rock)

Small white mineral fragment

Indeterminate; possibly quartz, calcite, or feldspar

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Quartz (Small Pebble)

Silicon Dioxide (SiO2)

Chalcedony (Agate/Chert)

Silicon Dioxide (SiO2)

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Quartz vein fragment

Quartz, silicon dioxide (SiO₂), likely milky to translucent quartz with iron-oxide or clay inclusions

Quartz Fragment

Silicon Dioxide (SiO2)

Weathered quartz-rich stone, likely milky quartz

Quartz (SiO₂), possibly a quartz-rich metamorphic or igneous fragment

Quartz-rich rock fragment

Unidentified quartz–feldspar-rich rock; exact lithology cannot be determined from the image

Small weathered mineral/rock fragment

Uncertain from image; possibly quartz-rich sandstone or a feldspar-bearing rock