Sedimentary (Anthropogenic)

Clear Quartz

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

Orange Calcite

Calcium Carbonate (CaCO3)

Banded Agate / Chalcedony

Silicon Dioxide (SiO2) with trace impurities

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky Variant)

Quartz (Silicon Dioxide, SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variations include Flint/Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Porcelain Tile (Sandstone-look)

Man-made Ceramic (resembling Quartz-rich Sandstone)

Yellow Calcite

Calcium Carbonate (CaCO3)

White Marble

Recrystallized Calcite (CaCO3)

Banded Agate (Tumbled)

Agate (Variety of Chalcedony/Quartz), SiO2

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Magnetite (Small Granule)

Magnetite (Fe3O4)

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Gneiss (specifically Banded Gneiss)

Gneiss

Quartz (Smoky or Clear variety with inclusions)

Silicon Dioxide (SiO2)

Chert (Jasper)

Silicon Dioxide (SiO2) with impurities

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Chalcedony/Jasper)

Microcrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Chert (often referred to as Flint or Jasper)

Chalcedony (SiO2) - Silicon Dioxide

Turquoise (Rough)

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

Red Jasper

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

Chalcedony (specifically Agate or Moonstone-like Quartz)

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Chert (Jasper)

Microcrystalline Silica (SiO2)

Carnelian

Carnelian Agate (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Orbicular Jasper (Ocean Jasper or Poppy Jasper variant)

Silicon Dioxide (SiO2) with various inclusions

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Chalcedony (Agate Nodules)

Silicon Dioxide (SiO2)

Marble

Recrystallized Calcite / Dolomite (CaCO3)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Bivalve Fossil (Shell Fragment)

Class Bivalvia (Calcium Carbonate - CaCO3)

Quartz (Milky or Clear variety)

Silicon Dioxide (SiO2)

Garnet Schist

Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Chalcedony (Agate/Carnelian type)

Silicon Dioxide (SiO2)