Man Made (Synthetic Rock)

Granite

Granite (Felsic Plutonic Rock)

Chert

Silicon dioxide (SiO2)

Banded Gneiss

Gneiss (Foliated Metamorphic Rock)

Colorless faceted gemstone, likely quartz

Quartz (SiO₂), probably rock crystal; exact identification is uncertain from the strongly backlit image

Mixed polished gemstone and mineral collection

Primarily quartz varieties (SiO₂), plus probable aventurine, rose quartz, amethyst, agate, jasper, serpentine, feldspar, and possibly dyed or man-made glass pieces

Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartzite

Metamorphic Quartzite (SiO2)

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Porphyry

Porphyritic Igneous Rock

Ferrous Slag (Iron Smelting By-product)

Fused Siliceous Slag

Quartzite

Metamorphic quartz rock (SiO2)

Quartzite

Metamorphic Quartz Rock (SiO2)

Sandstone (Water-worn Cobble)

Arenite (SiO2 with CaCO3 or Fe2O3 cement)

Sandstone

Arenite (SiO2 composition dominant)

Sandstone

Arenite (SiO2 based)

Unidentified gray stone/concrete-like fragment

Indeterminate; likely a fine-grained carbonate or cementitious geological fragment

Chalk

Calcium carbonate (CaCO3)

Chalk

Calcium Carbonate (CaCO3)

Possible basalt or iron-rich slag

Basalt (tentative; identification uncertain from image)

Blue Dyed Agate

Cryptocrystalline Quartz (SiO2)

Quartzite pebble

Quartzite (SiO2)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Blue slag glass / industrial glass fragment

Artificial silicate glass, composition variable; likely copper- or cobalt-colored furnace slag

Turquoise ring

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

Dalmatian jasper

Orbicular rhyolite, commonly sold as Dalmatian jasper; quartz- and feldspar-rich volcanic rock with dark amphibole/biotite inclusions

Sandstone

Arenite (specifically sublithic or quartz arenite)

Faceted colorless gemstone, likely quartz or glass imitation

Most plausibly rock crystal (quartz, SiO₂); identity is uncertain because the photograph shows only intense facet reflections

Chert (Flint)

Silicon Dioxide (SiO2)

Limpets Shell / Fossil Specimen

Patellogastropoda (Class)

Red glassy mineral specimen, likely synthetic ruby or red spinel

Most consistent with synthetic corundum (Al₂O₃, ruby) or synthetic spinel (MgAl₂O₄); exact identification requires testing

Sandstone

Sedimentary Rock (Quartz Sandstone)

Red Sandstone

Quartz Arenite (iron-stained) / SiO2

Slag (Industrial Glass/Metal)

Ferrous slag or Glassy silicate byproduct

Gemstone Ring

Various (Likely Glass, Cubic Zirconia, or assorted semi-precious stones)

Dyed Quartz Pendant

Silicon Dioxide (SiO2) with artificial dye

Natural Pearl

Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3

Mica Schist

Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)

Colorless faceted gemstone, likely quartz (rock crystal)

Quartz, silicon dioxide (SiO₂); exact identification cannot be confirmed from the photograph

Small colored gemstone or glass cabochons (uncertain)

Not identifiable from the image; the pieces may be colored glass or synthetic stones rather than natural minerals.

Chalk

Carbonate rock (mainly CaCO3)

Sandstone (Pebble)

Sandstone (SiO2 with matrix/cement)

Fossiliferous Limestone with Crinoid Stem

Sedimentary Rock with Crinoidea Fossil