Man Made Material (Jewelry, Metal Alloy)

Chert (often called Flint or Jasper)

Microcrystalline silica (SiO2)

Chert (varietal: Flint/River Pebble)

Cryptocrystalline Quartz (SiO2)

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Chert (Flint variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Nephrite Jade (Pounamu)

Nephrite [Ca2(Mg, Fe)5Si8O22(OH)2]

Tiger Iron

Tiger Iron (Hematite, Red Jasper, and Chert/Tiger's Eye composite)

Petrified Wood

Silicified Wood (SiO2)

Dinosaur Bone (Gembone)

Petrified Dinosaur Bone (Apatite/Silica replacement)

Chert (Jasper/Agate variety)

Microcrystalline quartz (SiO2)

Agate

Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Serpentine

Serpentine group ((Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4)

Diamond

Diamond (Pure Carbon, C)

Peridot (likely, based on color and appearance)

Olivine group mineral, specifically (Mg,Fe)2SiO4 (Forsterite-Fayalite solid solution series)

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sugilite

KNa2(Fe,Mn,Al)2Li3Si12O30 (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)

Chert (and/or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Yellow/Brown Jasper)

Silicon Dioxide (SiO2)

Black Jasper (Black Stone / River Pebble)

Silicon Dioxide (SiO₂), Opaque variety of Chalcedony

Sandstone (Pebble/Cobble)

Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Jasper

Quartz (SiO2) with impurities

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Rainbow Obsidian

Volcanic glass (SiO2 - approximately 70% or more silicon dioxide)

Zebra Jasper

Silicon dioxide (SiO2) with various impurities

Petrified Wood

Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)

Chert (Jasper/Agate variety)

Microcrystalline quartz (SiO2)

Chert (Jasper and Chalcedony)

Silicon Dioxide (SiO2)

Turquoise

Hydrated copper and aluminum phosphate (CuAl6(PO4)4(OH)8·4H2O)

Nuummite

Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)

Red Jasper

Silicon dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Red Jasper (beads)

SiO₂ (Silicon Dioxide)

Meteorite (Chondrite)

Stony Meteorite (Ordinary Chondrite)

Mica Schist

Mica Schist (predominantly composed of Muscovite or Biotite silicates)

Red Jasper

Jasper (a variety of Quartz, SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (Jasper variation)

Chert (Silicate mineral, SiO2)

Chert / Pink Chert

Silicon Dioxide (SiO2)

Yellow Chert (River Stone/Pebble)

Chert (Cryptocrystalline Quartz, SiO2)

Chert (Quartz)

Microcrystalline Silica (SiO2)

Chert (Jasper variety)

Microcrystalline quartz (SiO2)