Mineral Based Alloy (Anthropogenic)

Basalt with Caliche

Extrusive Mafic Igneous Rock with Secondary Carbonate Crust

Graphite

Graphite (Carbon, C)

Granite

Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Snowflake Obsidian

Vitreous volcanic silicate rock (SiO2) with Spherulite inclusions

Obsidian / Chert (Arrowhead Artifact)

Obsidian (volcanic glass, SiO2 with impurities)

Pink Granite

Granite (Phaneritic Acid Igneous Rock)

Porphyry

Porphyritic Basalt or Porphyritic Andesite

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

Soapstone (Talc-Schist)

Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)

Slate

Slate (Foliated Metamorphic Rock)

Mica Schist

Foliated Metamorphic Rock (Schist)

Glauconite (Sandstone or Shale)

Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2

Mica Schist (with Muscovite)

Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Serpentine

Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4

Chert (with Manganese Oxide coating)

Microcrystalline Quartz (SiO2)

Aquamarine

Aquamarine (Beryl variety) - Be3Al2(Si6O18)

Soapstone (Talc Schist)

Steatite

Coquina

Coquina Limestone

Schist

Mica Schist

Mica-rich Pegmatite

Pegmatite (rich in Muscovite and Biotite)

Limestone

Calcium Carbonate (CaCO3)

Quartz-veined Siltstone/Greywacke

Clastic Sedimentary Rock with Quartz Infill (SiO2 vein)

River Cobble with Algae Patina

Weathered Chert or Quartzite pebble (SiO2 dominated)

Muscovite Schist with Quartz

Mica Schist (KAl2(AlSi3O10)(OH)2 with SiO2)

Fuchsite Gneiss (Green Quartzite)

Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2 with Cr replacements)

Soapstone mushroom decorative carving

Steatite (Hydrous magnesium silicate, Mg3Si4O10(OH)2)

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Dalmation Jasper (Dalmation Stone)

Perthitic feldspar-quartz-amphibole rock

Basalt Pebble

Basalt

Basalt Pebble

Extrusive mafic igneous rock

Basalt (with possible weathering)

Basalt

Limestone Cobble

Sedimentary Limestone (Calcium Carbonate, CaCO3)

Granite

Phaneritic intrusive igneous rock

Basalt

Basalt (Mafic volcanic rock)

Granite

Granite (Felsic Plutonic Rock)

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica)

Basalt Pebble

Basalt (Mafic volcanic rock)

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Siltstone

Siltstone (primarily SiO2 with Al2O3)