Antropogenic (Man Made Material)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (likely Quartzose)

Arenite (SiO2 principal mineral)

Moonstone

Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8

River Pebble (Gravel)

Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)

Silver (Morgan Dollar)

Native Silver (Ag) - 90% Silver, 10% Copper alloy

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Amazonite

K(AlSi3O8), Microcline (potassium feldspar)

Chert (often called Jasper or Flint in this color variety)

Silicon Dioxide (SiO2)

Wood Paneling

Engineered Wood / Plywood Paneling

Petrified Wood

Silicified Wood (SiO2)

Nephrite Jade

Nephrite

Scoria (Volcanic Rock)

Scoria (often basaltic scoria)

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Libyan Desert Glass

Impactite (vitreous silica), SiO2

Diamond (in Matrix)

Carbon (C)

Aragonite Star Cluster

Aragonite (Calcium Carbonate, CaCO3)

Petrified Wood

Silicified Wood (primarily SiO2)

Bumblebee Jasper

Calcite-bearing Volcanic Tuff containing Sulfur and Arsenic (Orpiment/Realgar)

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Travertine (Calcareous Tufa)

Calcium Carbonate (CaCO3)

Chert (varietal Flint)

Chert (SiO2)

Chert (Chalk-associated Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Common Opal variant)

Microcrystalline Quartz (SiO2)

Sandstone (with manganese staining)

Clastic sedimentary rock (primarily SiO2)

Chert

Microcrystalline silica (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Limestone

Calcium carbonate (CaCO3)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Yellow Ochre / Limonite

Limonite (inter-mixed iron oxides and hydroxides, primarily FeO(OH)·nH2O)

Limonite (Iron Ore Congcretion)

Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Jasper Variant likely)

Silicon Dioxide (SiO2)

Granite Pebble

Granite (Phaneritic intrusive igneous rock consisting of Quartz, Alkali Feldspar, and Plagioclase)

Granite Pebble

Granite; primarily composed of Quartz (SiO2), Feldspar (KAlSi3O8), and Mica

Chert (Arrowhead or Projectile Point)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limonite

Limonite (FeOO·nH2O)

Crushed Stone (Gravel/Aggregates)

Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)

Petrified Wood

Silicified wood (Quartz/Chalcedony - SiO2)

Diamond (in a jewelry setting)

Cubic Carbon (C)

Diamond (set in a gold ring)

Carbon (C) - Adamantine cubic carbon