Mineral, Sediment

Tumbled banded sandstone pebble

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

Possible basalt or iron-rich concretion

Basaltic rock, likely composed mainly of plagioclase and pyroxene; exact identification requires testing

Jasper (Picture Jasper variety)

Silicon Dioxide (SiO2) with impurities

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)

Ironstone Concretion

Siderite or Hematite Concretion (FeCO3 or Fe2O3)

Petrified Wood

Silicified wood (primarily Silicon Dioxide - SiO2)

Spondylus Oyster Calcification / Fossilized Oyster

Spondylus (Thorny Oyster) / Calcium Carbonate (CaCO3)

Petrified Wood

Silicified Wood (SiO2)

Fossil shark tooth

Likely fossilized shark tooth, possibly *Carcharocles* or *Otodus* species

Fossil crocodilian skull and jaws

Crocodyliform fossil; exact genus and species cannot be determined from the image

Rounded iron-rich pebble

Likely ferruginous sandstone or ironstone pebble; exact identification requires testing

Greywacke with Quartz Vein

Greywacke (immature sandstone) with SiO2 inclusions

Tumbled jasper pebble

Microcrystalline quartz (chalcedony), chiefly SiO₂, with iron-oxide inclusions

Quartz crystal

Quartz (SiO₂), likely milky or iron-stained quartz

Fossiliferous Sedimentary Rock

Sedimentary Rock with Invertebrate Fossil Imprint

Rounded quartz-rich pebble, possibly weathered granite or quartzite

Indeterminate; likely quartz (SiO₂)-rich silicate rock

Dark river-worn stone, likely basalt

Basalt; primarily plagioclase feldspar and pyroxene, with possible olivine and magnetite

Blue glassy mineral fragment, possibly dyed/cobalt-colored calcite or aragonite

Uncertain from image; vivid blue coloration may indicate treated calcite (CaCO₃), aragonite (CaCO₃), or synthetic glass

Fossilized oyster shell

Ostrea/Exogyra sp.; calcium carbonate (mostly calcite)

Polished jasper pendant

Jasper, an opaque, microcrystalline variety of quartz (SiO₂)

Fossilized bone fragment (tentative)

Petrified bone; mineral replacement commonly by microcrystalline quartz, calcite, or iron oxides

Likely polished amber or amber-like resin specimen

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin; exact identification uncertain from the image

Chert (likely jasper-bearing chert)

Microcrystalline quartz (SiO₂), with iron-oxide staining and possible chalcedony

Quartz nodule (River pebble)

Silicon Dioxide (SiO2)

Rounded dark pebble, likely basalt

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine

Weathered quartz-rich rock, possibly iron-stained quartzite or quartz vein fragment

Mostly quartz (SiO₂), with probable iron-oxide staining and minor feldspar or clay minerals

Turquoise

Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Likely polished stromatolitic chert or jasper pebble

Silicified microbialite (microcrystalline quartz, SiO₂); identification is provisional from the photo

Quartz-mica schist (likely garnet-bearing)

Schist dominated by quartz and mica; possible biotite/muscovite and garnet

Rounded iron-rich stone, likely hematite-bearing sandstone or ironstone

Hematite/goethite-bearing ferruginous sandstone or ironstone; composition cannot be confirmed from appearance alone

Pebbles

Polymictic rock fragments

Rounded quartz-rich pebble

Likely quartzite or quartz-rich sandstone; predominantly SiO₂

Polished jasper cabochon

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

Clear quartz crystal (likely vein quartz)

Quartz, silicon dioxide (SiO₂), most likely colorless macrocrystalline quartz

Tumbled cream-colored stone, likely quartz or chalcedony

Microcrystalline quartz (chalcedony), SiO₂; exact identification is uncertain from the image

Quartz geode

Microcrystalline quartz (SiO₂), likely a small druzy quartz geode

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), likely iron-stained jasper/chert

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂)

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Tumbled blue-green stone, likely serpentine or green jasper

Probable serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or microcrystalline quartz (SiO₂); exact identification requires testing

Weathered quartz-rich pebble, possibly jasper or chert

Microcrystalline quartz (SiO₂), with iron-oxide staining and possible clay/mineral inclusions

Possible tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), commonly colored by iron oxides