Mineral (Specifically A Variety Of Quartz)

Blue Lace Agate (Banded Chalcedony)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (often referred to as Flint or Jasper when pigmented)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Aventurine

Aventurine Quartz (SiO2 with inclusions)

Conglomerate with Quartzite Pebbles

Clastic sedimentary rock (Conglomerate)

Calcite (or Alabaster, if truly carved)

Calcium Carbonate (CaCO3)

Yellow Jasper

Microcrystalline Quartz with Iron Oxide (SiO2)

Banded Agate (Onyx Variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Agate (Water-Worn Pebble)

Silicon Dioxide (SiO2) - Chalcedony

Chert Nodule

Chert (Cryptocrystalline variety of Quartz, SiO2)

Chert (Flint Nodules)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Chert / Flint Nodules

Chert (Cryptocrystalline variety of Quartz, SiO2)

Sandstone

Clastic sedimentary rock (primarily Quartz and Feldspar)

Picture Jasper

Silicon dioxide (SiO2)

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Jasper

Silicon dioxide (SiO2) with impurities

Chert (Jasper/Agate variety)

Cryptocrystalline Quartz (SiO2)

Chert (specifically Gray/Banded Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper

Silicon dioxide (SiO2)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Chert (Green variety)

Cryptocrystalline Quartz (SiO2)

Chert (and Chert-Jasper mix)

Microcrystalline Quartz (SiO2)

Amygdaloidal Rhyolite

Amygdaloidal Rhyolite (Felsic volcanic rock)

Marble

Metamorphosed Limestone (calcite formulation CaCO3)

Banded Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Peridot and Citrine Gemstones (in a ring setting)

Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)

Chert (Jasper/Flint variation)

Chert (SiO2)

Amazonite

Potassium feldspar (Microcline) - K(AlSi3O8)

Sandstone (Water-worn Pebble)

Clastic Sedimentary Rock (primarily SiO2)

Jasper (Brown Iron-Rich Variety)

Silicon Dioxide (SiO2) with Fe2O3 (Iron Oxide/Crystalline Quartz)

Jasper

Silicon dioxide (SiO2) with impurities

Sandstone (Micaceous)

Arenite (primarily SiO2 with Phyllosilicates)

Quartz (Drusy/Crystalline variety)

Silicon Dioxide (SiO2)

Green Agate

Silicon dioxide (SiO₂)

Chert Pebble (Jasperoid/Flint)

Silicon Dioxide (SiO2) - cryptocrystalline quartz

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese

Chert (Gravel Bit)

Microcrystalline silica (SiO2)

Jasper (Red and Yellow)

Silicon Dioxide (SiO2) with iron oxide impurities

Chalcedony Geode

Chalcedony (SiO2) within a geode structure

Carnelian

Carnelian (Silicon Dioxide - SiO2 with iron oxide impurities)

Garnet (specifically Almandine)

Almandine (Fe3Al2(SiO4)3)

Jasper

Jasper (Silicon Dioxide, SiO2)