Mineraloid Like Synthetic Material

Red Sandstone

Arenite (composed primarily of SiO2 with Fe2O3 cementation)

Green Quartzite (with Fuchsite)

Quartzite with Muscovite variety Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Sandstone

Arenite (primarily composed of SiO2)

Blue Quartz with Dumortierite/Magnesio-riebeckite inclusions

Quartz (SiO2) containing Dumortierite (Al7(BO3)(SiO4)3O3)

Chert / Flint Nodules

Chert (Cryptocrystalline variety of Quartz, SiO2)

Strawberry Quartz

Silicon Dioxide (SiO2) with inclusions of Goethite or Hematite

Quartzite

Quartzite (SiO2)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Chert (Iron-rich or Jasperoid)

Cryptocrystalline Quartz (SiO2)

Basalt with Quartz/Feldspar Vein

Amygdaloidal Basalt with Plutonic intrusion (SiO2/KAlSi3O8)

Muscovite Mica

Muscovite / KAl2(AlSi3O10)(OH)2

Siltstone

Siltstone (fined-grained clastic sedimentary rock)

Banded Sandstone

Arenite (composed primarily of Quartz: SiO2)

River Rock (Quartzite/Chert conglomerate)

Quartzite (SiO2)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Ferruginous/Banded)

Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)

Sandstone (likely Quartzose Sandstone)

Arenite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite (or Milky Quartz pebble)

Quartzite (Metamorphosed Sandstone) / Silicon Dioxide (SiO2)

Chert / Flint Nodules

Cryptocrystalline Quartz (SiO2)

Picture Jasper

Silicon Dioxide (SiO2) with impurities

Chert (containing small fossils)

Chert (Microcrystalline Quartz, SiO2)

Chrysocolla in Jasper (Chryso-Jasper)

Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)

Quartz River Pebble

Quartz (Silicon Dioxide, SiO2)

Gneiss

Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)

Chert (specifically Jasper/Flint)

Chert (SiO2)

Silty Sand / Loam

Unconsolidated Clastic Sediment (Silicon Dioxide / Alumino-silicates mixture)

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert / Jasper

Silicon Dioxide (SiO2)

Conglomerate (River Rock Aggregate)

Conglomerate (Lithic-clast conglomerate)

Quartzite (River Cobble)

Metamorphic Quartz-rich Rock

Olivine (Peridot when gem-quality)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Red Sandstone

Arenite (Ferruginous Sandstone)

Slag

Anthropogenic Vitrophyre (Iron or Smelting Slag)

Gneiss

Gneiss (Metamorphic high-grade)

Petrified Wood

Silicified Wood (primarily SiO₂ - Silicon Dioxide)

Sandstone (Quartzite-rich)

Clastic sedimentary rock (SiO2 primary)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)

Chert (Chert Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Glass / Silicon Dioxide (Man-made)

SiO2 (Amorphous Silicon Dioxide)

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)