Anthropogenic (Man Made Material)

Assorted Semi-Precious Gemstone Crosses

Quartz, Silicates, Carbonates (various)

Grey Slate

Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Gneiss (with Quartz Vein)

Gneiss (Metamorphic rock of varying mineralogy)

Chert (often called Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Silty Sand / Loam

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

Granodiorite (Gneissic texture)

Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)

Quartz

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Flint variety)

Microcrystalline Quartz (SiO2)

Lapis Lazuli

Lapis Lazuli (Rock containing Lazurite, Na8[AlSi O4]6[S,Cl,SO4,OH]2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)

Chert / Flint (with Iron Staining)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Serpentine

Serpentinite (rock) containing serpentine minerals (e.g., Antigorite, Lizardite, Chrysotile)

Herkimer Diamond

Quartz (SiO2)

Nuummite

Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (varieties include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Chert (Flint)

Microcrystalline Quartz (SiO2)

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Pink Granite

Phaneritic plutonic rock (dominated by Alkali Feldspar)

Sandstone

Sandstone (Clastic Sedimentary Rock)

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)

Milky Quartz

Silicon Dioxide (SiO2)

Green Fluorite in Host Rock

Fluorite (Calcium Fluoride, CaF2)

Red Quartzite River Pebble

Quartzite (SiO2 with iron oxide inclusions)

Mookaite (Mookaite Jasper)

Silicified Radiolarite (SiO2 with iron oxides)

Chalk

Calcium Carbonate (CaCO3)

Sandstone (with Feldspathic/Arkose qualities)

Arenite (primarily SiO2 with KAlSi3O8 components)

Fossil Coral (Petoskey Stone or Favosites)

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

Blue Calcite

Calcium Carbonate (CaCO3)

Travertine

Calcareous Tufa (CaCO3)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Pink Quartzite

Quartzite (primarily SiO2 with trace Fe2O3)