Man Made Glass (Often Grouped With Minerals In Lapidary)

Quartzite

Metamorphic Quartzite (primarily SiO2)

Quartzite

Metamorphic Quartzite (primarily SiO2)

Osumilite in Granite Matrix

(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30

Red jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Quartzite

Metamorphic Quartzite (SiO2)

Black onyx or black agate bead bracelet

Microcrystalline quartz, chiefly chalcedony (SiO₂); commonly sold as black onyx, sometimes dyed black agate

Quartzite

Metamorphic Quartz Arenite

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Obsidian

Volcanic glass (SiO2)

Amethyst (or Light Amethyst / Rose Quartz)

Quartz (Silicon Dioxide, SiO2)

Chert (Brecciated or Veined)

Microcrystalline Quartz (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Tumbled gray chalcedony (likely agate or quartzite)

Microcrystalline quartz, SiO₂ (chalcedony)

Yellow Quartz

Silicon Dioxide (SiO2)

Red Quartzite

Quartzite (Metamorphosed Quartz Arenite)

Sandstone

Arenite (composed primarily of SiO2)

Fossilized echinoid (sea urchin), likely a flint/chalk-associated test

Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)

Feldspar (Orthoclase)

Potassium Alveolar Silicate (KAlSi3O8)

Rose Quartz / Iron-stained Quartz

SiO2 (Silicon Dioxide)

Granite

Granite (a plutonic rock)

Tumbled Quartz

Silicon Dioxide (SiO2)

Sunstone

Oligoclase or Andesine (Feldspar Group), (Ca,Na)((Al,Si)4O8)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Chert (Jasper/Flint var.)

Silicon Dioxide (SiO2)

Bog Iron / Limonite Concretion

Goethite/Limonite mixture (FeO(OH)·nH2O)

Serpentine (polished/tumbled piece)

Serpentinite; chiefly antigorite, lizardite, and/or chrysotile, commonly with magnetite and carbonate minerals

Chert / Chalcedony

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2, often with CaCO3 or Fe2O3 cement)

Tumbled serpentine

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximately Mg₃Si₂O₅(OH)₄

Hypersthene

Enstatite (Hypersthene variety), (Mg,Fe)SiO3

Biotite / Black Mica

K(Mg,Fe)3(AlSi3O10)(F,OH)2

Quartz Pebble

Silicon Dioxide (SiO2)

Red garnet crystal cluster

Most likely almandine garnet, Fe₃Al₂(SiO₄)₃; exact species cannot be confirmed from the image alone.

Hypersthene

Hypersthene (Magnesium Iron Silicate - (Mg,Fe)SiO3)

Grey Chalcedony

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 primarily)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Goldstone (likely blue-free synthetic goldstone pendant)

Synthetic aventurine glass; silica glass with dispersed metallic copper crystals

Quartz (Golden Quartz / Citrine / Iron-stained Quartz)

Silicon Dioxide (SiO2)

Sodalite

Na8(Al6Si6O24)Cl2

Garnet-bearing Schist

Almandine Garnet [Fe3Al2(SiO4)3] in Micaceous Schist

Echinoidea (Fossil Sea Urchin)

Echinodermata Echinoidea