Organic Material (Likely A Fruit Or Berry)

Petrified Wood

Silicified wood (primarily quartz, SiO2)

White calcite (likely tumbled calcite or marble fragment)

Calcite, calcium carbonate (CaCO₃); if the specimen is granular and rock-like, it may be marble, a calcite-rich metamorphic rock

Iron-rich meteorite candidate

Unclassified iron meteorite or stony-iron meteorite; confirmation requires chemical and nickel testing

Red cabochon gemstone, likely carnelian

Carnelian: orange-red chalcedony, microcrystalline quartz (SiO₂)

Red synthetic corundum (ruby-colored lab-grown sapphire)

Corundum, aluminum oxide (Al₂O₃), likely synthetic and chromium-colored

Chert (White/Light Tan)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chrysocolla on Matrix

Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Weathered volcanic rock, likely basalt

Basalt; commonly composed of plagioclase, pyroxene, and iron-rich oxides

Blue calcite (likely)

Calcite, calcium carbonate (CaCO₃)

Rounded sandstone pebble

Quartz-rich sandstone; commonly arkose or lithic sandstone

Petrified Wood (Silicified Wood)

Silicified Wood (primarily Chalcedony/Quartz, SiO2)

Polished copper-bearing rock, likely cuprite-rich copper ore

Cuprite (Cu₂O) with native copper and iron-oxide matrix, probable

Bronzite-bearing gabbro (likely norite)

Norite/gabbro: plagioclase feldspar + orthopyroxene (bronzite), commonly with minor olivine, magnetite, or biotite

Milky quartz cluster

Quartz (silicon dioxide, SiO₂), likely druzy or microcrystalline quartz

Likely small metallic meteorite fragments

Unclassified iron or stony-iron meteorite; mineralogy cannot be confirmed from the image

Travertine (likely polished limestone)

Calcite-rich carbonate rock; predominantly CaCO₃

Petrified Wood

Silicified Wood (SiO2)

Likely tumbled quartz-rich pebble

Quartz (SiO₂), possibly a weathered quartzite or chalcedony pebble

Tumbled brown chalcedony (possibly carnelian or jasper)

Microcrystalline quartz, SiO₂; likely iron-stained chalcedony

Tumbled green aventurine (probable)

Quartz aggregate, SiO₂, commonly containing fuchsite mica inclusions

Tumbled banded sandstone pebble

Quartz-rich sandstone (chiefly SiO₂), likely iron-oxide-stained

Banded Chert

Silicon Dioxide (SiO2)

Banded Gneiss (River Cobble)

Gneiss (a high-grade metamorphic rock)

Limestone

Calcium Carbonate (CaCO3)

Agatized fossil fragment, possibly silicified coral

Chalcedony (microcrystalline SiO₂) replacing carbonate fossil material

Carved quartz (likely rose quartz and green aventurine/quartz)

Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine

Piddock bored rock (likely Mudstone or Shale)

Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock

Tumbled agate/chalcedony

Microcrystalline quartz (SiO₂), likely agate or jasper-bearing chalcedony

Orange calcite fragment

Calcite (CaCO₃), likely iron-stained or orange-colored calcite

Brick

Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)

Graphite-veined Quartzite

Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)

Sandstone with trace fossil

Sandstone, possibly with Skolithos or similar trace fossil

Petrified Wood

Silicified wood (primarily SiO2)

Amber with dark mineral/organic inclusions

Fossilized plant resin (amber; chiefly polymerized diterpenoid resin)

Iron Meteorite (likely an Individual specimen)

Iron Meteorite (Group IAB, IIAB, IIIAB, etc., Fe-Ni alloy)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Fossil-bearing limestone

Bioclastic limestone, likely containing bivalve or brachiopod impressions

Quartz geode

Quartz (SiO₂), likely drusy/microcrystalline quartz lining a geode cavity

Weathered agate or chalcedony nodule

Microcrystalline quartz (SiO₂), likely agate/chalcedony with iron-oxide staining

Weathered quartz-rich sandstone or granitic rock

Indeterminate; likely iron-stained quartz sandstone, possibly weathered granite

Micaceous schist (likely biotite schist)

Schist dominated by biotite mica, quartz, and feldspar