Man Made Glass (Often Grouped With Minerals In Lapidary)

Chert (variations include Flint/Novaculite)

Chert (formula: SiO2)

Plagioclase Feldspar

NaAlSi3O8 – CaAlSi2O8 (Sodium-Calcium Aluminum Silicates)

Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.

SiO2 (Silicon Dioxide)

Chert

Microcrystalline quartz (SiO2)

Blue opalite (often sold as synthetic opal)

Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)

Chert (Black Flint)

Silicon Dioxide (SiO2)

Blue Goldstone

Aventurine Glass

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Chert (SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)

Jasper with Hematite inclusions

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)

Green Apophyllite and Stilbite on Quartz Cluster

Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)

Chert (Jasper)

Microcrystalline Silica (SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Fossilized Coral (Petoskey Stone / Hexagonaria)

Hexagonaria percarinata / Rugosa coral (CaCO3)

Chert (Chalcedony/Agate variety)

Microcrystalline Quartz (SiO2)

Milky quartz with iron-oxide staining

Quartz, silicon dioxide (SiO₂), likely massive milky quartz

Serpentinite

Serpentinite (complex silicate mineral group (Mg,Fe)3Si2O5(OH)4)

Quartz with Iron Inclusions

Silicon Dioxide (SiO2) with Hematite/Limonite

Milky Quartz

Silicon Dioxide (SiO2)

Red aventurine

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Feldspar (specifically Orthoclase)

Potassium Aluminum Silicate (KAlSi3O8)

Red Jasper

Silicon Dioxide (SiO2)

Quartzite pebble

Quartzite (SiO2)

Chert (Nodular Chert)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Yellow Aventurine

Silicon Dioxide (SiO2) with inclusion of Mica

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.

Yellow Chert (Chert / Cryptocrystalline Quartz)

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Chert (Flint)

Microcrystalline quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky or Cloudy variety)

Quartz (Silicon Dioxide, SiO2)

Rough Sapphire (Corundum)

Corundum (Al2O3)

Milky Quartz

Silicon Dioxide (SiO2)

Hematoid Quartz

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Petrified Wood

Silicified Wood (primarily SiO₂)

Quartz with Iron Staining

Silicon Dioxide (SiO2)

Red Jasper with Quartz

Silicon Dioxide (SiO2) with Hematite impurities

Chert (Flinty variety)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)