Industrial Byproduct (Anthropogenic Rock Like Material)

Fossil bivalve shell

Ribbed pectinid or related bivalve; originally calcite/aragonite (CaCO₃), likely partially mineralized

Opalite

Man-made Glass (SiO2 + additives)

Polished ocean jasper / orbicular jasper (probable)

Silica-rich chalcedony (microcrystalline quartz, SiO₂) with iron oxides and altered volcanic inclusions

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Quartz–iron-oxide breccia or weathered quartz-bearing rock

Quartz (SiO₂) with limonite/goethite and possibly iron sulfides in a brecciated host

Sandstone

Clastic Sedimentary Rock

Serpentine

Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4

Polished banded stone, likely zebra jasper

Zebra jasper (banded microcrystalline quartz, chiefly SiO₂, with iron-oxide and carbonate impurities)

Agate

Agatized Chalcedony (SiO2)

Amazonite pendant

Amazonite, a green variety of microcline feldspar (KAlSi₃O₈)

Rounded yellow-brown cobble

Likely weathered sandstone or quartz-rich conglomeratic clast; exact identification requires a fresh surface and testing

Petrified Wood

Silicified wood (SiO2)

Sandstone

Arenite (SiO2 with various cementing minerals)

Agate

Silicon Dioxide (Chalcedony), SiO2

Phyllite

Phyllite (regional metamorphic rock)

Polished tektite (likely indochinite)

Natural silica-rich impact glass; mainly SiO₂ with Al₂O₃, FeO, MgO, CaO, and Na₂O

Asphalt Concrete (Bituminous Concrete)

Bituminous aggregate

Petrified Wood

Silicified Wood (SiO2)

Garnet Schist

Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)

Rough Diamond

Diamond (C)

Quartz with Schorl (Black Tourmaline)

Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)

Sandstone

Clastic Sedimentary Rock

Small pale stone (undetermined)

Unidentified geological specimen; image lacks detail for a reliable mineral or rock identification

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

Carved Soapstone or Serpentine-rich rock

Fossil Snail Shell

Gastropoda fossil

Basalt

Basalt (Mafic volcanic rock)

Rough Garnet (Almandine)

Almandine Garnet (Fe3Al2(SiO4)3)

Blue sodalite-bearing rock

Likely sodalite (Na₈(Al₆Si₆O₂₄)Cl₂) in a white feldspathic matrix; exact identification is uncertain from the image.

Quartz Vein in Host Rock

Hydrothermal Quartz (SiO2) in Slates/Schists

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Likely black tourmaline (schorl) in host rock

Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Small brown mineral fragment, possibly quartz/chert

Uncertain; likely microcrystalline quartz (SiO₂) or a weathered silicate rock

Granite Pegmatite

Phaneritic Plutonic Igneous Rock

Banded Sandstone (Differential Weathering)

Clastic Sedimentary Rock (primarily SiO2)

Tumbled orange-brown stone, possibly quartzite or jasper

Undetermined; likely iron-stained quartz-rich rock (quartz, SiO₂)

Basalt River Stone

Basalt (Aphanitic Mafic Igneous Rock)

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Tumbled turquoise

Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O

Sandstone

Clastic Sedimentary Rock

Sandstone (Red/Brown)

Arenite (SiO2 dominated with iron oxides)

Red Sandstone

Arenite (hematite-cemented quartz sandstone)