Sedimentary Rock Or Mineral (Depending On Origin And Purity)

River Pebble

Siliceous rock fragment

Geode (Unopened)

Quartz Geode (SiO2) / Chalcedony Concretion

Dark gray rock fragment, likely basalt

Basalt; chiefly plagioclase feldspar and pyroxene, commonly with minor olivine and magnetite

Banded Pebble (Metamorphic Slate or Gneiss with Quartz Veining)

Metamorphic Rock with Quartz/Calcite Veins

Potassium Feldspar (Microcline / Orthoclase)

KAlSi3O8

Possible iron-rich meteorite fragment

Unidentified Fe–Ni meteoritic material; identification cannot be confirmed from this blurry image

Sandstone

Sedimentary Rock (Quartz arenite or arkose)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (composed primarily of SiO2 with various lithic fragments)

Pumice

Pumicite (fine-grained pumice), Scoria (similar origin but denser and darker, usually basaltic)

Biotite gneiss (probable)

Foliated quartz–feldspar–mica gneiss; commonly containing biotite mica, quartz, and plagioclase/alkali feldspar

River Rock

N/A - General term for water-worn stones

Hag Stone

Perforated sedimentary rock (typically limestone, sandstone, or flint)

Druzy Quartz

Silicon Dioxide (SiO2)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Small weathered stone, likely sandstone or limestone fragment

Indeterminate clastic or carbonate rock; mineral composition cannot be confirmed from the image

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

Clear Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based clastic rock)

Sandstone

Clastic Sedimentary Rock (Quartz arenite or similar)

Weathered quartz-rich rock, likely chert or quartzite

Microcrystalline quartz (SiO₂), possibly with iron-oxide staining

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Witch Stone (Hag Stone)

Perforated Sedimentary Rock (Typically Sandstone or Limestone)

Wishing Stone (Basalt/Greywacke with Quartz Vein)

Basalt or Siltstone with SiO2 (Quartz) hydrothermal intrusion

Clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Basalt

Mafic Igneous Rock (composed primarily of pyroxene and calcium-rich plagioclase)

Sapphire

Corundum (Al2O3)

Ruby

Corundum (Al2O3:Cr)

Banded quartz-rich metamorphic rock (likely quartzite or quartz-mica schist)

Quartzite/schist composed chiefly of SiO₂ quartz with mica, feldspar, and iron-oxide or copper-colored accessory minerals

Ruby (Corundum)

Aluminum Oxide (Al₂O₃:Cr)

Jasper (likely a variety of Yellow or Mustard Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Inukshuk Rock Sculpture (composed of Granite, Slate, and Amethyst)

Silicon Dioxide (Amethyst portion, SiO2) with mixed silicate rock assemblage

Tumbled Mixed Gemstones and Rocks

Various mineral species including quartz (SiO2) and silicate minerals

Conglomerate

Conglomerate

Red Sandstone / Mudstone Nodules (L Liesegang rings)

Sedimentary Rock (Quartz/Hematite Clay Mix)

Fossil Shark Tooth

Selachii (fossilized dentition)

Gneiss

High-grade metamorphic rock (Gneiss)

Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Likely quartz-bearing rock fragment

Quartz (SiO₂), possibly with calcite or feldspar

Banded gneiss

Foliated quartz–feldspar gneiss, likely with mica