Sedimentary Or Igneous Fragment

Peach-colored feldspar fragment

Likely potassium feldspar (orthoclase or microcline; KAlSi₃O₈)

Granite-like rock fragment

Likely granitic aggregate; quartz–feldspar–mica assemblage

Fossil Shark Tooth Fragment

Elasmobranchii dentition (fragment)

Clear quartz pendant

Quartz (silicon dioxide, SiO₂)

Small pale-yellow crystal, possibly calcite

Calcite (CaCO₃), tentative identification from the image

Fossilized Echinoid Fragment (Calycinal/Boss Fossil)

Echinodermata fossil fragment

Iron-rich conglomerate or breccia (tentative)

Poorly sorted lithic conglomerate/breccia, with iron-oxide staining; exact composition cannot be determined from the photo

Feldspar-rich igneous rock, likely granite or gneiss fragment

Granite-like quartz–feldspar rock; exact identification is uncertain from the blurred image

Likely bituminous coal or carbon-rich shale fragment

Bituminous coal; predominantly carbon with macerals and minor clay/pyrite

Weathered granite or granitic rock fragment

Granite; chiefly quartz, feldspar, and mica/amphibole

Weathered quartz-rich rock, possibly granite or quartzite

Indeterminate; likely quartz–feldspar aggregate (SiO₂ with feldspar minerals)

Weathered quartz-rich pebble

Likely quartzite or silicified granitoid; mainly microcrystalline quartz (SiO₂)

Likely weathered quartz-bearing rock fragment

Indeterminate; possibly granitic or metamorphic quartz–feldspar aggregate

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Small gray, fine-grained pebble (possibly a weathered sandstone or siltstone)

Unidentified lithic pebble; composition cannot be determined from the image

Metallic sulfide ore fragment, possibly pyrite-bearing rock

Indeterminate; likely pyrite (FeS₂) in a sulfide-rich matrix

Unidentified tan rock fragment

Likely limestone or calcareous sandstone; exact identification requires testing

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz fragment

Silicon Dioxide (SiO2)

Weathered quartz-rich rock or fossil fragment

Indeterminate; likely quartz-bearing sandstone or siliceous fossil material

Labradorite rough fragment

(Ca,Na)[Al,Si]A̲₁O₈

Weathered granite (likely)

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Granite (likely)

Granite, a quartz–feldspar-rich intrusive igneous rock

Likely granite

Granite, a coarse-grained felsic intrusive igneous rock

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with marine fossils

Crushed Stone (Likely Limestone or Granite)

Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite

Shale and Pebble Fragment

Sedimentary Rock (Mudstone/Shale with Silica Pebble)

Weathered graywacke or sandstone fragment

Lithic sandstone, likely quartz–feldspar–rock-fragment aggregate

Likely muscovite mica schist

Muscovite-rich mica schist; muscovite KAl₂(AlSi₃O₁₀)(OH)₂

Small gray mineral fragment (likely quartz or quartz-rich rock)

Unidentified; quartz is SiO₂

Quartz

Silicon Dioxide (SiO2)

Possible granite or granitic rock fragment

Unidentified granitoid; precise identification is not possible from this small image

Weathered conglomeratic volcanic rock

Likely basaltic volcanic breccia or agglomerate, with plagioclase, pyroxene, volcanic glass, and lithic fragments

Milky quartz (rough quartz)

Quartz, silicon dioxide (SiO₂)

Pumice or vesicular volcanic rock

Pumice; chiefly volcanic glass (silica-rich, composition commonly rhyolitic to dacitic)

Conglomerate Pebble (with Chert / Quartz)

Sedimentary Conglomerate / Breccia Pebble

Granite (weathered fragment)

Granite; chiefly quartz, alkali feldspar, plagioclase, and mica

Tumbled pale feldspar-rich stone (likely granite or quartzite fragment)

Indeterminate; possible quartz–feldspar aggregate, commonly granite or feldspathic quartzite

Likely chert or chalcedony

Microcrystalline quartz (SiO₂), possibly waxy chalcedony or chert

Clear quartz crystal fragment

Quartz, silicon dioxide (SiO₂)