Mineralological Specimen

Ferruginous Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Diorite (River Cobble)

Intrusive Igneous Diorite

Chert Pebble (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Jasper (Milky/Cream Variety)

Silicon Dioxide (SiO2) - variety of Chalcedony

Quartz Pebble

Silicon Dioxide (SiO2)

Yellow Quartzite Pebble

Quartzite (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Quartz (Milky/River Quartz)

Silicon Dioxide (SiO2)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Milky Quartz Geode Fragment

Silicon Dioxide (SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

White Quartz Pebble

Silicon Dioxide (SiO2)

Chert (River Stone/Pebble)

Chert (SiO2)

Rose Quartz

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

Pyrite (on Quartz/Sulfide matrix)

Iron Sulfide (FeS2)

Sunstone

Plagioclase feldspar (with Copper or Hematite inclusions)

Agate (Moss or Plume Agate variety)

Silicon Dioxide (SiO2)

Amazonite

Potassium feldspar (Microcline), K(AlSi3O8)

Limonite (after Pyrite Pseudomorph)

Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Fossilized Megalodon Tooth Fragment

Otodus megalodon (Carcharocles megalodon fossil)

Quartzite Pebble (with Iron Staining)

Quartzite (SiO2)

Granite (Alkali-feldspar rich)

Phaneritic Felsic Igneous Rock (Major components: KAlSi3O8, SiO2)

Watermelon Tourmaline

Elbaite - Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3OH

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Granodiorite or Diorite

Granodiorite / Diorite

Chert

Microcrystalline Quartz (SiO2)

Magnetite / Iron Ore

Magnetite (Fe3O4)

River Pebble (Quartzite/Chert)

Quartzite with inclusions (SiO2)

Green Jasper (with Quartz veining)

Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2

Granitic Pegmatite with Tourmaline and Sphalerite

Pegmatite containing Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) and Sphalerite ((Zn,Fe)S)

Chert (Common Opal/Agate mixture)

Microcrystalline Quartz (SiO2)

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) within a resin matrix

Quartzite River Rock

Quartzite (primarily SiO2)

Ferruginous Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

White Quartz Pebble

Silicon Dioxide (SiO2)

Tiger's Eye (Golden and Blue Pietersite mix)

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Obsidian

Volcanic glass (SiO2-rich amorphous silicate)

Diamond (set in Gold)

Diamond (pure carbon, C)

Slag (Industrial Byproduct)

Ferro-silicate glass (Slag)

Obsidian

Volcanic glass (no mineral formula due to amorphous structure, mostly SiO2)