Sedimentary Or Igneous Fragment

Weathered quartz-rich pebble

Likely quartzite or quartz-rich granite fragment; exact identification is uncertain from the blurred image

Iron-stained quartz with possible feldspar

Quartz (SiO₂), likely with limonite/goethite staining and minor feldspar or mica

Polished pink feldspar pebble

Microcline or orthoclase feldspar, KAlSi₃O₈, possibly with quartz or mica inclusions

Quartz-rich rock fragment, possibly granite or quartzite

Primarily quartz (SiO₂), with possible feldspar and iron-oxide staining

Milky quartz

Quartz (silicon dioxide, SiO₂)

Small gray rock fragment

Indeterminate fine-grained silicate rock; possibly granite, gneiss, or weathered concrete-like lithic fragment

Likely porphyritic basalt or andesite fragment

Fine-grained mafic to intermediate volcanic rock; commonly plagioclase ± pyroxene, amphibole, and iron oxides

Pumice or vesicular volcanic rock

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

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Weathered feldspar-rich igneous rock, likely granite or granodiorite fragment

Granite–granodiorite; chiefly quartz (SiO₂), plagioclase and potassium feldspar, with minor dark biotite/hornblende

Crushed Stone (Likely Limestone or Granite)

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

Rounded limestone pebble

Micritic limestone, composed mainly of calcite (CaCO₃)

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Weathered basalt or dark igneous rock fragment

Likely basalt, a fine-grained mafic volcanic rock; exact identification is uncertain from the image

Limestone with Stylolites

Calcareous sedimentary rock (CaCO3)

Rounded sandstone pebble

Quartz-rich sandstone, commonly arkose or lithic sandstone

Gneiss (Banded Gneiss)

Gneiss

Granite (likely weathered or cut fragment)

Granite; chiefly quartz, feldspar, and mica

Sandstone (lithic wacke/conglomerate mix)

Clastic Sedimentary Rock (SiO2 with lithic fragments)

Weathered iron-rich stone, possibly hematite-bearing basalt or ironstone

Indeterminate; likely Fe-oxide-rich basalt/ironstone, dominated by hematite (Fe₂O₃) and/or magnetite (Fe₃O₄)

Conglomerate Pebble (with Chert / Quartz)

Sedimentary Conglomerate / Breccia Pebble

Likely granitic rock fragment

Granite or granodiorite; chiefly quartz, feldspar, and mica

Limestone

Calcium Carbonate (CaCO3)

Seashell Fragment (Aragonite/Calcite)

Calcium Carbonate (CaCO3) - Shell fragment

Quartz Geode Fragment

Crystalline Silicon Dioxide (SiO2)

Basalt Xenolith in Matrix

Basaltic Mafic Xenolith / Ultra-mafic Inclusion

Chalcedony (Blue Dragon/Gray Chalcedony)

Silicon Dioxide (SiO₂)

Unidentified small rock fragment

Indeterminate; appearance may be consistent with a weathered sandstone or limestone fragment

Likely tumbled sandstone or limestone

Quartz-rich sandstone (possibly calcarenite/limestone)

Weathered sandstone or quartz-rich sedimentary pebble

Indeterminate lithic fragment; likely quartz arenite (sandstone)

Quartz (Microcrystalline variety)

Silicon Dioxide (SiO2)

Fossilized Tooth Fragment

Vertebrate Fossil (Mammalia indet.)

Small quartz-rich rock fragment (tentative)

Likely quartz (SiO₂) with possible feldspar or carbonate inclusions

Rounded granitic pebble

Granite, likely quartz–feldspar–biotite aggregate

Likely weathered granite or granitic pegmatite fragment

Granite, composed mainly of quartz, feldspar, and dark mica or amphibole

Quartz-rich pegmatite or quartz vein fragment

Massive to coarse-grained quartz (SiO₂), likely with feldspar and minor mica

Coquina

Coquina (Bioclastic Limestone)

Possible weathered sandstone or iron-rich sedimentary rock

Indeterminate; likely quartz-rich sandstone with iron-oxide cement

Chert (specifically Yellow Jasper variety)

Silicon Dioxide (SiO2)

Ironstone Concretion

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Chert (Arrowhead Fragment)

Microcrystalline Quartz (SiO2)

Concrete Fragment

Artificial Conglomerate (Cement and Aggregate)