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

Geode with Iron-Stained Quartz/Calcite

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix

Greenschist with Quartz Veining

Greenschist (commonly containing Chlorite, Actinolite, and Epidote)

Horn Coral Fossil

Rugosa (Order Rugosa)

Epidote in Quartz (Epidosite)

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Basalt with Quartz Veining

Basalt (Mafic Extrusive Igneous Rock) with SiO2 (Silicon Dioxide) veins

Chalcedony (Yellow/Honey variety)

Microcrystalline Quartz (SiO2)

Conglomerate

Clastic sedimentary conglomerate

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Sandstone (composed primarily of sand-sized minerals or rock grains)

Mahogany Obsidian

Volcanic Glass (predominantly SiO2 with inclusions of Hematite or Magnetite)

Aragonite

Aragonite (Calcium Carbonate - CaCO3)

Amethyst (Tumbled/Weathered Quartz)

Amethyst (SiO2 with iron impurities)

Quartz Pebble (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Banded Iron Formation (BIF)

Banded Iron Formation (Magnetite-Hematite-Chert)

Galena

Lead(II) sulfide (PbS)

Conglomerate

Conglomerate (Clastic sedimentary rock)

Fossil Coral (Petoskey Stone or Favosites)

Favosites (specifically Hexagonaria percarinata if silica-replaced Michigan type)

Ironstone Nodule (Ironstone Concretion)

Siderite-rich Mudstone (FeCO3) or Limonite (FeO(OH)·nH2O)

Rhyolite

Rhyolite (felsic volcanic rock)

Conglomerate (or Breccia)

Clastic Sedimentary Rock (Conglomeratic)

Coquina / Fossiliferous Limestone

Calcareous bioclastic sedimentary rock (CaCO3)

Gastropod Steinkern (Internal Mold Fossil)

Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix

Garnet (Pyrope-Almandine series)

Garnet Group, (Mg,Fe)3Al2Si3O12

Blue Topaz (specifically London Blue or Swiss Blue based on color saturation)

Al2SiO4(F,OH)2 (Aluminum Silicate Fluoride Hydroxide)

River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)

Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)

Banded Calcite (Green Onyx)

Calcium Carbonate (CaCO3)

Banded Iron Formation (BIF)

Banded Iron Formation

Chrysocolla

Hydrated copper phyllosilicate, Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)

Rhyolitic Tuff (Breccia Type)

Rhyolitic Pyroclastic Rock (Mixed Silicates including Quartz, Feldspar, and Volcanic Glass)

Dendritic Agate or Tree Agate

Silicon Dioxide (SiO2) with impurities of manganese or iron oxide

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Satin Spar (Selenite)

Gypsum (CaSO4·2H2O)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Quartz Vein in Host Rock (clastic sediment)

Silicon Dioxide (SiO2) in matrix

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Silty Sand / Loam

Unconsolidated Clastic Sediment (Silicon Dioxide / Alumino-silicates mixture)

Coquina / Shelly Limestone

Coquina (calcium carbonate, CaCO3)

Banded Iron Formation (Jaspillite)

Banded Iron Formation (BIF) / Jaspillite

Clear Quartz crystals on a Matrix base (Geode fragment)

Silicon Dioxide (SiO2)

Garnet

Almandine (Fe3Al2(SiO4)3)

Chert (Yellow or Tan Chert)

Silicon Dioxide (SiO2)

Black Obsidian

Obsidian, volcanic glass (Amorphous SiO₂)