Mineral, Possibly Rock Fragment Containing A Mineral

Likely tumbled green mineral (possibly serpentine or aventurine)

Indeterminate; possibilities include serpentine-group minerals, nephrite, or green aventurine quartz

Likely calcite or limestone fragment

Calcite (CaCO₃), possibly limestone dominated by calcite

Jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and possibly chlorite or epidote inclusions

Sandstone (Quartzose Sandstone)

Arenite

Limestone with Quartz/Calcite Veins

Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)

Pegmatitic granite, possibly potassium-feldspar-rich

Coarse-grained granite; mainly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), plagioclase, and biotite/hornblende

Banded metamorphic rock, likely gneiss or metasedimentary slate

Quartz–feldspar–mica gneiss (tentative), possibly containing iron-oxide veins

Small quartz-rich pebble

Quartz (SiO₂), possibly quartzite or weathered granite fragment

Likely galena-bearing ore

Galena (PbS), possibly mixed with quartz and sulfide minerals

Weathered polymictic conglomerate or breccia

Polymictic conglomerate/breccia, likely iron-stained and quartz-bearing

Iron-stained quartz fragment (probable quartzite or chert)

Quartz, SiO₂; possibly iron-oxide-stained microcrystalline silica

Possible granite or granitic rock fragment

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

Iron-stained quartz, possibly smoky quartz

Quartz (SiO₂), with reddish-brown iron-oxide staining; exact variety is uncertain from the photo

Likely weathered feldspar-rich rock fragment

Uncertain; possibly orthoclase or microcline feldspar in a pegmatitic rock

Fossilized mammalian tooth fragment

Likely a fossil molar or premolar; exact taxon cannot be determined from the image

Sandstone

Arenite

Sandstone

Arenite

Quartz-rich pegmatite, possibly with mica and iron staining

Quartz (SiO₂) with probable muscovite/biotite mica and minor iron oxides

Amethyst (Geode Fragment)

Silicon Dioxide with iron impurities (SiO2)

Likely quartz-bearing granite or pegmatite fragment

Granite/pegmatite, chiefly quartz (SiO₂) with feldspar and possibly mica

Weathered iron-rich rock, possibly basalt or ironstone

Uncertain; likely weathered basalt (plagioclase–pyroxene) or hematite/goethite-bearing ironstone

Likely quartz-rich pebble

Quartz (silicon dioxide, SiO₂), possibly a quartzite fragment

Sandstone

Arenite (SiO2 based)

Sandstone (Fossiliferous)

Clastic Sedimentary Rock (primarily SiO2)

Fossiliferous Limestone (Coquina)

Calcite (CaCO3) with Bioclastic inclusions

Amber (possibly a small polished amber cabochon)

Fossilized tree resin; amber is an organic gemstone, not a mineral

Weathered rock fragment (likely granite or quartz-rich sandstone)

Uncertain; possible granitic fragment containing quartz and feldspar

Unidentifiable Rock Fragment

Fossiliferous limestone (likely containing shell fossils)

Calcite-rich limestone, chiefly CaCO₃; visible fossils are uncertain from the image

Sandstone

Arenite

Blue-green stone, likely copper-mineral-bearing rock

Uncertain; possibly chrysocolla- or copper-carbonate-bearing material

Small pale stone, likely quartzite or limestone fragment

Indeterminate; possible quartzite (mostly SiO₂) or calcitic limestone (CaCO₃)

Tumbled speckled pebble, likely marble or limestone

Calcite-rich carbonate rock; possibly impure marble (CaCO₃)

Quartz-rich translucent fragment

Quartz, silicon dioxide (SiO₂), possibly chalcedony or vein quartz

Greenish altered rock, possibly serpentinite or chlorite-rich schist

Tentative: serpentine-group minerals, chiefly antigorite/lizardite, or chlorite–actinolite assemblage

Polished breccia (decorative stone)

Likely carbonate breccia: angular carbonate-rock fragments in a calcite-rich matrix; exact identification requires testing

Chert Conglomerate (or Breccia)

Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)

Rounded pebble with dark mineral inclusion

Likely granitic or volcanic pebble containing a mafic inclusion; exact identification requires testing

Sandstone

Arenite (lithic or quartz sandstone)

Small tan mineral or rock fragment (unidentified)

Indeterminate from the image; no diagnostic features are visible

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly iron-stained quartz or quartzite

Quartz-rich rock fragment, possibly milky quartz

Quartz (SiO₂), likely a small vein-quartz or quartz-bearing rock fragment