Anthropogenic (Man Made Product Subject To Geological Processes)

Aura Quartz (Rainbow Quartz)

Silicon Dioxide (SiO2) with metallic vapor coatings

Ferruginous Quartz

Quartz (Silicon Dioxide, SiO2) with iron oxide inclusions

Concrete or asphalt-like aggregate surface with a dark fragment

Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock

Goldstone and pink quartz bead strands

Goldstone is aventurescent copper-bearing glass; pink beads are likely rose quartz (SiO₂), though dyed or glass imitations are possible

Small seashell fossil or shell fragment

Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate

Weathered, quartz-rich metamorphic rock (likely schist or gneiss)

Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining

Golden Calcite

Calcium Carbonate (CaCO3)

Blue Goldstone

Aventurine Glass

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Quartz Vein on Matrix

Silicon Dioxide (SiO2)

Milky Quartz with Chlorite inclusion

Silicon Dioxide (SiO2) with Chlorite group inclusions

Dark foliated metamorphic rock, probably schist

Mica schist, likely quartz–muscovite/biotite schist

Quartz-rich metamorphic rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂), with dark biotite, amphibole, or iron-oxide inclusions

Red gemstone ring, likely garnet or synthetic ruby

Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish

Quartz

Quartz (SiO2 - Silicon Dioxide)

Aquamarine with Quartz

Beryl (Be3Al2Si6O18) with Quartz (SiO2)

Polished black stone, likely black obsidian

Obsidian (volcanic glass), chiefly silica-rich rhyolitic composition

Tumbled jasper (likely brecciated or leopard jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

Red Jasper

Jasper (Silicon Dioxide with iron oxide inclusions), SiO2

Red jasper (likely brecciated jasper)

Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides

Tumbled jasper or brecciated jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and dark mineral inclusions

Blue calcite (probable)

Calcite, CaCO₃

Likely biotite-bearing metamorphic rock (schist or gneiss)

Mica schist/gneiss; chiefly quartz, feldspar, and biotite mica

Ferruginous Sandstone

Clastic sedimentary rock (primarily Quartz with Iron Oxide cement)

Pink Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

Calcite

Calcite (Mineral, Calcium Carbonate - CaCO3)

Likely foliated metamorphic rock (quartz-mica schist or gneiss)

Quartz–feldspar–mica metamorphic rock; exact identification requires a fresh surface and tests

Muscovite Schist

KAl2(AlSi3O10)(OH)2 (Muscovite) in Schist Matrix

Chert with Asphaltum (or Tar)

Silica (SiO2) with natural Bitumen/Asphaltum

Quartzite

Quartzite (primarily SiO2)

Quartz pebble in concrete

Quartz (SiO₂), embedded in Portland-cement concrete

Quartz

Quartz (Silicon Dioxide - SiO2)

Slag (Industrial Glass/Metal)

Ferrous slag or Glassy silicate byproduct

Amethyst

Amethyst (Silicon Dioxide, SiO2 + Fe)

Unidentified Rock Fragment

Unknown

Sandstone

Arenite (SiO2 based with various mineral cements)

Sandstone

Arenite (primarily SiO2 with trace Fe2O3)

Hematite

Hematite (Fe2O3)

Red jasper (likely polished/chipped fragment)

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Quartz

Silicon Dioxide (SiO2)

Beach sand with a dark pebble

Unconsolidated siliciclastic sediment, chiefly quartz and feldspar; dark pebble likely basalt or volcanic rock