Sedimentary (Processed Mineral Product)

Beads (likely glass or man-made material)

N/A (artificial material)

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Petrified Wood (Silicified Wood)

Silicified Wood (primarily Chalcedony/Quartz, SiO2)

Quartz (possibly milky quartz)

Quartz (Silica; SiO₂)

Serpentine (Serpentinite)

Antigorite, Lizardite, and Chrysotile: (Mg,Fe)3Si2O5(OH)4

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Blue Lace Agate

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Iron Ore / Ironstone Concretion

Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Quartz (Engineered Quartz Surface)

Silicon Dioxide (SiO2) based composite

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Blue Quartzite (Aventurine)

Quartzite (primarily SiO2) with inclusions of Dumortierite or Magnesio-riebeckite

Slag Glass

Amorphous Silica Glass (with metal oxide inclusions)

Granite

Intrusive Phaneritic Felsic Igneous Rock

Serpentinite (Serpentine Rock)

Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.

Jasper

Silicon dioxide (Microcrystalline Quartz, SiO2)

Granite

Granite (Felsic intrusive igneous rock)

Greenstone

Metabasalt / Greenschist facies rock

Serpentinite

Serpentinite (a rock composed predominantly of serpentine group minerals)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Satin Spar (Selenite variant)

Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Rhodonite in Quartz Matrix

Rhodonite (Manganese Silicate - (Mn,Fe,Mg,Ca)SiO3)

Rhodonite

Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3

Fragmented Sedimentary Pebble

Clastic Sedimentary Specimen

Mahogany Obsidian

Volcanic glass (SiO2 with Hematite or Magnetite inclusions)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Green Tourmaline

Verdelite (Silicate mineral); Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2 with mineral cement)

Quartz (Smoky/Druzy variety)

Silicon Dioxide (SiO2)

Sandstone (Quartzite-rich)

Clastic sedimentary rock (SiO2 primary)

Greenschist

Greenschist (chlorite-epidote schist)

Dyed Tumbled Quartz

Silicon Dioxide (SiO2)

Pink Dyed Agate

Chalcedony (SiO2) with artificial dyes

Larimar

Blue Pectolite (NaCa2Si3O8(OH))

Gold Nugget

Native Gold (Au)

Dream Amethyst (Chevron Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Quartz Pebble

Silicon Dioxide (SiO2)