Man Made Material, Not A Natural Rock Or Mineral Specimen

Aventurine

Quartz containing inclusions of Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Opalite

Synthetic Opalised Glass

Polished blue stone, likely sodalite or dyed agate

Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz, SiO2)

Dark rounded pebble, likely basalt or slag

Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag

Blue Chalcedony Cube

Silicon Dioxide (SiO2)

Crushed Limestone

Calcium Carbonate (CaCO3)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)

Mother of Pearl (Nacre)

Aragonite (CaCO3) with Organic Matrix

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Diamond

Carbon (C)

Unidentified gray stone

Likely quartz-rich stone; exact identification is not possible from the image

Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)

Amorphous Silicon Dioxide (SiO2) with chemical additives (e.g., Cobalt for blue color)

Rough turquoise-bearing rock (probable turquoise matrix)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a host-rock matrix

Iron-stained quartz-rich rock, possibly jasper or chert

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides

Seven Chakra Bonded Stone

Bonded composite of Red Jasper, Carnelian, Tiger's Eye, Aventurine, Lapis Lazuli, Amethyst, and Clear Quartz

Boxwork or Septarian Concretion

Septarian nodule / Boxwork weathering

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone Concretion

Septarian or Carbonate-cemented Sandstone Concretion

Mixed tumbled gemstone collection

Varied minerals, likely including amethyst, sodalite/lapis lazuli, quartzite or aventurine, jasper, and agate/chalcedony

Sandstone (Quartzose)

Arenite (primarily SiO2)

Rough Diamond

Pure Carbon (C)

Likely weathered metallic mineral or slag fragment

Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag

Asphalt

Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)

Chert

Silicon dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Sandstone (SiO2 with various trace minerals)

Sandstone (Calcareous or Ferruginous)

Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)

Tumbled brecciated jasper

Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Crushed Stone (Likely Limestone or Granite)

Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite

Hematite Beads

Hematite (Fe2O3)

Dyed Agate / Painted Stone

Silicon Dioxide (SiO2) with artificial pigment

Green cabochon gemstone, likely aventurine or dyed chalcedony

Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony

Tumbled amber-colored chalcedony or jasper

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

Pale blue-gray quartz-rich pebble (tentative)

Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment

Speckled rounded stone, likely granite or granitic gneiss

Granite/granitic gneiss; primarily quartz (SiO₂), feldspar, and dark mica or amphibole

Sandstone (Ferruginous)

Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)

Sandstone (specifically Banded Sandstone)

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (SiO2 variety)

Rough Sapphire (Corundum)

Corundum (Al2O3)