Antropogenic (Man Made Material)

Chert (White Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Green Onyx (Banded Calcite)

Travertine (CaCO3 - Calcium Carbonate)

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O)

Chert (often colloquially called Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Andesite

Andesite (Intermediate Extrusive Volcanic Rock)

Tiger's Eye

Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2

Shiva Lingam

Cryptocrystalline Quartz (Jasproid/Sandstone) with Iron Oxide (Fe2O3)

Amber

Succinite (fossilized resin)

Granite

Granite (Phaneritic intrusive igneous rock)

Chalcedony (specifically Agate or Common Opal variety)

Cryptocrystalline Silica (SiO2)

Chert (Commonly known as Flint)

Microcrystalline Quartz (SiO2)

Chert (and its variety Flint)

Silicon Dioxide (SiO2) - Microcrystalline or cryptocrystalline Quartz

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Black Marble

Recrystallized Calcite (CaCO3)

Water and Silt (Sedimentary Environment)

Suspended Sediment / H2O (dihydrogen monoxide)

Chert / Flint Nodule

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (and Limestone)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (Light Grey / Flint variant)

Cryptocrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

River Rock (Quartzite/Chert conglomerate)

Quartzite (SiO2)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2)

Green Aventurine (Green Quartzite)

Silicon Dioxide (SiO2) with inclusions of Fuchsite (chromium-rich mica)

Chert (varietal: Flint/River Pebble)

Cryptocrystalline Quartz (SiO2)

Chert (with Quartz veins)

Microcrystalline Quartz (SiO2)

Chert (and Chert Flake)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Shale

Fissile Mudstone (primarily composed of clay minerals and quartz)

Schist

Lepidoblastic Mica Schist

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Serpentine

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Bloodstone

Heliotrope (cryptocrystalline Quartz, SiO2 with inclusions of Hematite)

Chert (Jasper/Quartzite variety)

Microcrystalline Silica (SiO2)

Quartzite

Quartzite (primarily SiO2)

Olivine (Peridotite)

Magnesium Iron Silicate - (Mg, Fe)2SiO4

Basalt

Basalt

Quartzite with Dark Mineral Inclusions

Quartzite (primarily SiO2) with accessory minerals

Sandstone (Ferruginous)

Arenite (variable SiO2 with Fe2O3 staining)

Basalt

Extrusive Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)

Chert (Jasper/Quartzite river stone)

Microcrystalline Silicon Dioxide (SiO2)