Sedimentary Or Igneous Fragment

Fluorite with Quartz coating

Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

Mica Schist fragment

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3(AlSi3O10)(OH)2)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Quartz Druze on Matrix (Geode Fragment)

Quartz (Silicon Dioxide, SiO2)

Granite fragment

Granite

Unknown Rock Fragment

Undetermined

Quartz-rich mineral fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Milky quartz (likely quartz vein fragment)

Quartz, silicon dioxide (SiO₂)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Fossilized shell fragment

Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Likely weathered quartz-rich rock, possibly smoky quartz or chert

Quartz (SiO₂), though exact identification is uncertain from the photograph

Black Obsidian

Volcanic Glass (SiO2 with impurities)

Gneiss

Gneiss (Metamorphic Rock)

Unidentified Rock Fragment

Unknown

Quartz

Silicon Dioxide (SiO2)

Pebble

Lithic fragment / Rounded rock fragment

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Small gray rock fragment, likely granite or diorite

Uncertain; probable coarse-grained silicate rock dominated by feldspar and quartz, possibly biotite/hornblende

Fossilized Bone

Vertebrate Fossil Fragment (Calcium Phosphate / Hydroxyapatite)

Quartz Cluster (Likely Ferruginous)

Silicon Dioxide (SiO2)

Quartz (Grain/Fragment)

Silicon Dioxide (SiO2)

Quartz (Milky/Clear Quartz)

Silicon Dioxide (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Weathered basalt or iron-rich volcanic rock

Mafic volcanic rock, likely basalt; exact identification requires testing

Generic Pebble

Lithic Fragment

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode form

Healer's Gold (Pyrite and Magnetite in Schist)

Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist

Quartz Vein in Schist

Quartz-rich Micaceous Schist (SiO2 + phyllosilicates)

Coquina / Fossiliferous Limestone

Fossiliferous Limestone / CaCO3

Common Quartz Pebble

Silicon dioxide (SiO2) rock fragment

Pebble

Lithic fragment / Weathered rock fragment

Dark basalt or fine-grained mafic rock

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine or iron-titanium oxides

Likely weathered quartz-bearing rock fragment

Indeterminate; appears to contain quartz (SiO₂) with iron-oxide staining, possibly from quartzite, granite, or pegmatite

Quartz (Milky or Cloudy)

Silicon Dioxide (SiO2)

Chert (Common Opal variant)

Silicon Dioxide (SiO2)

Weathered reddish-brown rock fragment

Probably altered basalt or fine-grained volcanic rock; exact identification requires testing

Quartz (Milky/Clear Fragment)

Silicon Dioxide (SiO2)

Quartz (with Sandstone/Quartzite rocks)

Silicon Dioxide (SiO2)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Fluorite

Calcium Fluoride (CaF2)