Sedimentary Or Igneous Fragment

Iron-stained breccia or weathered conglomerate pebble

Clastic sedimentary rock; likely quartz-rich sandstone/breccia with dark mafic or iron-manganese fragments

Fossilized Shell Fragment

Invertebrate marine fossil, likely calcium carbonate replacement

Uncertain polished mineral specimen

Indeterminate; possibly quartz or feldspar with iron-oxide staining

Shale

Laminated Mudstone

Rounded gray-green beach cobble

Unidentified lithic cobble; exact rock type cannot be determined from the image

Small shell fragment (likely gastropod or bivalve fossil)

Fossilized calcium-carbonate shell; chiefly aragonite or calcite (CaCO₃)

Oyster Shell Fragment

Crassostrea virginica (or related Bivalvia)

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite (recrystallized quartz sandstone)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Chert or flint fragment

Microcrystalline quartz (SiO₂), likely chalcedony/chert

Likely rough granite or granitic rock fragment

Granite (quartz–feldspar–mica assemblage; exact identification is uncertain from the image)

Granite (likely)

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

Raw Sunstone

Sunstone (Feldspar variety, (Ca,Na)((Al,Si)2Si2O8))

Dark igneous rock fragment, likely basalt

Basalt; commonly composed of plagioclase, pyroxene, and minor olivine or magnetite

Likely weathered sandstone fragment

Sandstone, chiefly quartz (SiO₂) grains cemented by silica, calcite, or iron oxides

Worn quartz-rich pebble

Likely microcrystalline quartz (SiO₂), possibly a weathered chert or milky quartz fragment

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

Small rounded stone, likely quartz-rich granite or granitic rock

Probable granitoid fragment; mainly quartz (SiO₂) and feldspar, with minor dark mica/amphibole

Weathered quartz-rich rock or fossil fragment

Indeterminate; likely quartz-bearing sandstone or siliceous fossil material

Coquina / Shelly Sandstone

Calcareous Sandstone / Coquina

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate

Basalt Fragment

Basalt (Aphanitic Mafic Igneous Rock)

Granite fragment

Phaneritic Igneous Rock (Granitic composition)

Probable rough basalt or mafic igneous fragment

Fine-grained basalt, likely plagioclase–pyroxene–olivine aggregate

Basalt with Granite Inclusions (Xenolith)

Mafic Igneous Rock (Basalt) with Felsic Igneous Inclusion (Granite)

Weathered quartz-rich pebble

Likely quartz-rich granitoid (quartz and feldspar); exact identification is uncertain from the image

Weathered granite fragment

Granite, chiefly quartz, feldspar, and mica

Granite or granitic pebble

Granite; chiefly quartz (SiO₂), feldspar, and mica/amphibole

Granite

Granite (Felsic Plutonic Rock)

Weathered graywacke or sandstone fragment

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

Quartz

Silicon Dioxide (SiO2)

Weathered breccia or conglomeratic sandstone

Clastic sedimentary rock, likely carbonate-cemented breccia/conglomerate

Likely chert or chalcedony

Microcrystalline quartz (SiO₂), possibly waxy chalcedony or chert

Granite-like rock fragment

Likely granitic aggregate; quartz–feldspar–mica assemblage

Polished dark mineral fragments, likely hematite or magnetite

Hematite (Fe₂O₃) or magnetite (Fe₃O₄)

Fossiliferous limestone fragment

Bioclastic limestone, primarily calcite (CaCO₃)

Weathered conglomeratic volcanic rock

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

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Feldspar-rich igneous rock, likely granite or gneiss fragment

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

Mixed collection of natural stones

Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2) with various iron-oxide inclusions