Metamorphic (Likely Gneiss Or Schist Based On Texture)

Iron-rich quartzite or ironstone

Ferruginous quartzite; predominantly quartz (SiO₂) with hematite/goethite (Fe₂O₃/FeO(OH))

Quartz Pebble

Silicon Dioxide (SiO2)

Zoisite with Ruby

Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)

Likely weathered quartz or quartz-rich pebble

Quartz, silicon dioxide (SiO₂)

River Cobble (Basaltic/Andesitic)

Mafic to Intermediate Volcanic Rock

Gray Limestone Fragment

Limestone (CaCO3)

Limestone (specifically Crushed Limestone/Calcictic)

Calcium Carbonate (CaCO3)

Weathered quartz-rich pebble

Milky quartz, chiefly silicon dioxide (SiO₂), possibly with iron-oxide staining and minor feldspar

Quartz Crystal Cluster (with Selenite Satin Spar)

Silicon Dioxide (SiO2)

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Quartz Pebble (with probable Iron staining)

Silicon Dioxide (SiO2)

Crushed Limestone and Calcite

Calcium Carbonate (CaCO3)

Weathered greenstone (likely serpentinite or altered basalt)

Serpentinite-group rock, commonly dominated by serpentine minerals (antigorite/lizardite); exact identification requires testing

Quartzite pebble

Quartzite (SiO2 with impurities)

Yellow Quartzite (or Yellow Chalcedony Pebble)

Silicon Dioxide (SiO2)

Amazonite

Microcline (KAlSi3O8 variant)

Obsidian

Obsidian (Volcanic Glass)

Artificial Rock Face (Faux Rock)

Glass Fiber Reinforced Concrete (GFRC)

Yellow Chalcedony (Agate/Chert)

Cryptocrystalline Quartz (SiO2)

Fossilized Shark Tooth

Selachii (Elasmobranchii subclass)

Amazonite

K(AlSi3O8), Microcline (potassium feldspar)

Jade

Jade can refer to two distinct minerals: Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (Na(Al,Fe3+)Si2O6). Based on the image, showing a relatively uniform green color and possibly slight translucence in bead form, it is very likely one of these, but determining which one from a photo is difficult without specific testing.

Weathered iron-rich rock, possibly limonite-bearing sandstone or laterite

Limonite/goethite-rich ferruginous rock; exact identification requires testing

Gravelly, weathered sediment (likely glacial till)

Unconsolidated diamicton; mixed lithologies, commonly including quartz, feldspar, and weathered silicate rock fragments

Granite Boulder (Glacial Erratic)

Granite

Weathered granite or granitic gneiss

Granite; chiefly quartz, alkali feldspar, plagioclase, and minor mica

Porphyritic Basalt or Andesite

Porphyritic Basalt / Andesite

Dark gray volcanic rock, probably andesite or basalt

Fine-grained mafic–intermediate volcanic rock; likely basalt (plagioclase ± pyroxene), possibly andesite

Quartzite Pebble

Quartzite (SiO2)

Fossilized Bone (Petrified Bone)

Permineralized Vertebrate Remains

Dark rounded stone, possibly basalt or iron-rich chert

Indeterminate from image; candidates include basalt (mafic volcanic rock) or chert (microcrystalline quartz, SiO₂)

Man-made Carved Stone (Scream Mask/Skull motif)

Carved Soapstone or Serpentine-rich rock

Dyed Agate

Silicon Dioxide (SiO2) - Variety Agate / Chalcedony

Porphyry

Porphyritic Andesite or Rhyolite

Tiger Iron

Tiger Iron (Hematite, Red Jasper, and Chert/Tiger's Eye composite)

Yellow Quartzite (Onyx Pebble)

Silicon Dioxide (SiO2) - Quartzite

Basalt with Epidote (Greenstone)

Epidote-bearing Metabasalt

Dark gray slate (possibly argillite or shale)

Slate, a low-grade metamorphic rock derived mainly from shale; composition commonly quartz, illite/muscovite, chlorite, and clay minerals

Native Gold Nuggets

Native Gold (Au)

Weathered vesicular stone, possibly pumice or scoria

Vesicular volcanic rock; likely pumice (highly vesicular rhyolitic material) or scoria (basaltic material)

Possible tektite or dark volcanic rock fragment

Uncertain; likely natural silicate glass (tektite) or basalt

Veined Pebble (likely a Quartz-Veined Pebble)

Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)