Mineralological Specimen

Quartzite Beach Pebble

Quartzite (primarily SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Rose or Milky variety fragment)

Silicon Dioxide (SiO2)

Chert (variations include Flint or Jasper)

Silicon Dioxide (SiO2)

Fluorite (Purple variety)

Calcium Fluoride (CaF2)

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2)

Azurite with Malachite

Azurite: Cu3(CO3)2(OH)2 / Malachite: Cu2CO3(OH)2

Red Jasper (River Polished Quartzite)

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) impurities

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F

Pink Opal

Hydrated Silica (SiO2·nH2O)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Quartz (Smoky or Clear variety with inclusions)

Silicon Dioxide (SiO2)

Shale (with minor calcite veining)

Clastic sedimentary rock (primarily clay minerals and quartz)

Agate Nodule (partially vuggy Quartz)

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Sandstone (with potential Quartzite characteristics)

Clastic sedimentary rock (primarily SiO2)

Anyolite (Ruby in Zoisite)

Zoisite with inclusions of Hornblende and Ruby (Ca2Al3(SiO4)3(OH))

Pegmatite with Smoky Quartz and Feldspar

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8)

Ferruginous Sandstone (Ironstone)

Sedimentary rock with high iron oxide content (Fe2O3 / FeO(OH))

Rose Quartz

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

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Chert (specifically var. Flint or Jasper-rich Breccia)

Microcrystalline Quartz (SiO2)

Chert (Commonly known as Flint or Jasper when pigmented)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Dyed Blue Agate

Silicon Dioxide (SiO2)

Limestone Pebble

Calcium Carbonate (CaCO3)

Diamond (as featured in jewelry)

Diamond (C - pure carbon)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz

Silicon dioxide (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Basalt (Gravel Pebble)

Basalt (contains pyroxene, plagioclase feldspar, and olivine)

Greasy Quartz (likely carved Milky Quartz or Aventurine)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Sandstone (Pebble/Cobble)

Arenite (primarily SiO2)

Beryl (likely Aquamarine or Green Beryl)

Beryllium aluminum silicate (Be3Al2Si6O18)

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Concrete Rubble with Aggregate

Hardened Portland Cement Paste with Coarse Aggregate

Chert / Flint

Chert (SiO2)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Chert Conglomerate (or Breccia)

Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)

Metal Chain Belt with Square Plates

Not applicable (man-made)