Sedimentary Or Igneous Fragment

Cobblestones (Basalt/River Rock)

Polished lithic fragments and rounded pebbles

Milky quartz

Quartz (silicon dioxide, SiO₂)

Granite fragment

Granite

Milky quartz (quartz-rich fragment)

Quartz, silicon dioxide (SiO₂)

Likely milky quartz

Quartz (silicon dioxide, SiO₂)

Pebble

Clast (specifically a granule or small pebble)

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Small quartz crystal fragment (probable)

Quartz, silicon dioxide (SiO₂)

Unidentifiable Specimen

Undetermined

Quartz pebble in a coarse mineral-rich rock

Quartz (SiO₂), possibly in a quartz-rich conglomerate or breccia

Fossiliferous limestone

Bioclastic limestone, commonly crinoidal or shelly limestone (calcite, CaCO₃)

Banded calcite (likely cave deposit or vein fragment)

Calcite, CaCO₃

Coquina / Fossiliferous Limestone

Fossiliferous Limestone / CaCO3

Fossil shell fragment, likely bivalve or brachiopod

Indeterminate fossilized mollusk/brachiopod; commonly calcite (CaCO₃)

Weathered quartz-bearing metamorphic rock

Likely quartz–feldspar schist or gneiss, possibly with iron-oxide alteration

Weathered polymictic rock fragment, likely granite-rich conglomerate

Indeterminate mixed lithology; apparent granitic clasts containing quartz, feldspar, and dark mafic minerals

Raw garnet-rich metamorphic rock

Likely garnet-bearing schist or garnetite; garnet-group silicates, commonly almandine (Fe₃Al₂Si₃O₁₂)

Milky Quartz with Matrix

Silicon Dioxide (SiO2)

Unidentified small green-brown mineral fragment

Indeterminate from the photograph; possibly olivine, but identification is uncertain

Orange Calcite

Calcium Carbonate (CaCO3)

Weathered volcanic rock fragment

Likely andesite or basaltic-andesite; exact identification requires fresh surface and testing

Banded Agate (with small Geode cavity)

Silicon Dioxide (SiO2) - Chalcedony variety

Quartz (Milky/Clear)

Silicon Dioxide (SiO2)

Uncertain coarse-grained igneous fragment

Likely granite or granitic pegmatite; quartz–feldspar–mica assemblage

White Quartz

Silicon Dioxide (SiO2)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Gneiss

Foliated Metamorphic Rock

Pebble (likely Sandstone or Granitic Pebble)

Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)

Unknown Rock Fragment

Undetermined

Fossilized bivalve shell fragment

Fossil Mollusca, likely a pectinid or related bivalve; exact identification requires the other shell half and locality

Weathered sandstone or iron-stained sedimentary rock

Quartz-rich sandstone, likely ferruginous sandstone (SiO₂-dominated)

Calcite

Calcium Carbonate (CaCO3)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Clear or Milky)

Silicon Dioxide (SiO2)

Weathered sandstone fragment

Quartz-rich sandstone (compositionally uncertain)

Likely quartz pebble or quartz fragment

Quartz, SiO₂ (identification from the photo is tentative)

Weathered granitic rock (likely granite or granodiorite)

Granite–granodiorite; mainly quartz, feldspar, and mica/hornblende

River Stone (Chalcedony/Jasper variety)

Microcrystalline Quartz (SiO2)

Rounded beach pebble, likely fine-grained sandstone or siltstone

Indeterminate sedimentary lithic fragment; exact identification requires examination

Pink granite (weathered fragment)

Granite, primarily quartz–feldspar–mica (pink alkali feldspar, plagioclase, quartz, biotite/hornblende)

Sandstone (Micaceous Sandstone)

Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)

Likely milky quartz fragment

Quartz (silicon dioxide, SiO₂)