Organic (If Resin) Or Synthetic (If Glass); Simulating Sedimentary Or Metamorphic (For Natural Stones)

Calcite

Calcium Carbonate (CaCO3)

Shale

Shale

Greenstone (Greywacke or Nephrite Jade variant)

Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)

Quartzite (River Cobble)

Metamorphic Quartz-rich Rock

Sandstone (Tumbled/River Pebble)

Arenite (composed primarily of SiO2)

Yellow Quartz Pebble (Citrine or Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with traces of Titanium, Iron, or Manganese

Dyed Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Greenstone with Quartz Veining

Epidiorite or Metabasalt with SiO2 (Quartz) veins

Pumice

Pumice (a highly vesicular volcanic rock)

Quartz (Milky/Clear)

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

River Siltstone Pebble

Siltstone (primarily composed of silica and clay minerals)

Chrysocolla

Hydrated copper silicates (Cu,Al)2H2Si2O5(OH)4·nH2O

Quartzite with Iron Inclusions

Metamorphosed Quartz (SiO2)

Coquina (Fossiliferous Limestone)

Coquina (Organic Clastic Limestone)

Sandstone

Arenite (SiO2 based with quartz grains)

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Hematite

Iron(III) oxide (Fe2O3)

Greenstone (Greenstone River Pebble)

Greenschist (metamorphosed mafic igneous rock)

Quartz with Chlorite or Hornblende inclusions

Silicon dioxide (SiO2) with phyllosilicate or amphibole inclusions

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2 with iron inclusions)

Amber Flint (Chert)

Cryptocrystalline Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Quartzite

Quartzite (mostly SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Sandstone (Quartzose)

Arenite (primarily SiO2)

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)

Sandstone

Arenite

Turquoise (Dyed Howlite/Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (Target mineral) / Ca2B5SiO9(OH)5 (Actual specimen: Howlite)

Quartz Pebble (Water-worn)

Silicon Dioxide (SiO2)

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 based)

Sandstone (Quartzite Pebble)

Arenite / Metamorphosed Sandstone (SiO2)

Quartzite

Quartzite (SiO2)