Sedimentary Or Igneous Fragment

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

Indeterminate lithic clast; possible quartz–feldspar aggregate

Gravel or Crushed Stone

Fragmented Aggregate Stone

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

Indeterminate clastic sedimentary rock; possible ferruginous sandstone or weathered breccia

Quartz fragment

Silicon Dioxide (SiO2)

Gravel / Small Pebble

Rock Fragment (Gravel)

Foliated metamorphic cobble, likely gneiss

Biotite–quartz–feldspar gneiss (tentative)

Garnet Gneiss

Garnetiferous quartzo-feldspathic gneiss

Small weathered rock fragment

Indeterminate; possibly granitic or altered feldspathic material

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Geode (Unopened)

Quartz/Chalcedony concretion

Quartz (Milky/Crystalline fragment)

Silicon Dioxide (SiO2)

Quartz Geode / Druzy Quartz Node

Silicon Dioxide (SiO2)

Small quartz-rich mineral fragment

Quartz (SiO₂), possibly milky or chalcedonic quartz

Quartz Heart or Arrowhead Shape

Silicon Dioxide (SiO2)

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Fossiliferous limestone, possibly a shell or bone fragment

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

Likely quartz-rich pebble fragment

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

Garnet

Garnet (X3Y2(SiO4)3)

Gneissic Schist

Gneiss-schist (Metamorphic rock)

Likely milky quartz fragment

Quartz (SiO₂)

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 Fragment

Silicon Dioxide (SiO2)

Quartz vein fragment

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

Small weathered mineral/rock fragment

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

Quartz (Microcrystalline/Gravel)

Silicon Dioxide (SiO2)

Garnet Gneiss

Gneiss containing Almandine Garnet

Quartz Geode fragment

Crystalline Silicon Dioxide (SiO2)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Quartz fragment

Quartz (silicon dioxide, SiO₂), likely milky or smoky quartz

Quartz-rich weathered rock, possibly quartzite

Quartzite (mostly SiO₂); exact identification is uncertain from the image

Quartz Chip

Silicon Dioxide (SiO2)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Unidentifiable Rock Fragment

Rough amber-colored quartz or calcite fragment

Likely quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Weathered iron-rich rock, possibly limonite-bearing basalt or ironstone

Uncertain; likely Fe-oxide/hydroxide–stained mafic rock (hematite Fe₂O₃, goethite FeO(OH), and silicates)