Mineraloid Like Synthetic Material

Coquina / Fossiliferous Limestone

Calcareous bioclastic sedimentary rock (CaCO3)

Ferruginous Sandstone

Arenite with Iron-Oxide cement (primarily Fe2O3 • nH2O)

Bull Quartz (White Quartz)

Silicon Dioxide (SiO2)

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Laterite

Laterite (Iron and aluminum-rich residual rock)

Chert (specifically Flint or Dark Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Schist

Mica Schist (primarily Muscovite [KAl2(AlSi3O10)(OH)2] or Biotite)

Red Sandstone

Arenite (primarily composed of SiO2 with Fe2O3 cement)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chert (Iron-stained)

Chert (Microcrystalline Quartz, SiO2)

Chert (Jasper/Agate variety)

Microcrystalline quartz (SiO2)

Coquina / Limonite-stained Limestone

Sedimentary Limestone with Iron Oxyhydroxide (FeO(OH)·nH2O)

Banded Chert or Agate

Silicon Dioxide (SiO2)

Chert (Flint variety)

Microcrystalline Quartz (SiO2)

Chert (often called Flint for dark variants)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Schist with Quartz/Mica

Mica Schist (primarily Muscovite and Quartz)

Basalt

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

Quartz with Mica/Chlorite inclusions

Silicon Dioxide (SiO2) with phyllosilicate inclusions

Chert (specifically a Worked Flint/Knapped Flake)

Chert / Flint (Microcrystalline Quartz, SiO2)

Chert (specifically White Chert or Novaculite)

Silicon Dioxide (SiO₂)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Yellow Chert (River Stone/Pebble)

Chert (Cryptocrystalline Quartz, SiO2)

Nuummite

Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (Jasper variation)

Chert (Silicate mineral, SiO2)

Chert (specifically Flint or Common Chert)

Silicon Dioxide (SiO2)

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Red Sandstone (Siltstone/Mudstone variety)

Ferruginous Sandstone (composed primarily of Quartz with Hematite cementation)

Tufa

Calcareous Tufa (CaCO3)

Shale

Fissile Clay-dominant Mudrock (SiO2, Al2O3, K2O, Na2O, CaO, MgO)

Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)

Chert (Black Chert/Flint)

Silicon Dioxide (SiO2)

Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')

Calcite (Calcium Carbonate, CaCO3)

Chert (variously known as Flint or Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Chert (Chert Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Soapstone

Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)

Chert Pebble (Flint)

Microcrystalline/Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)