Synthetic (Man Made Material Mimicking Natural Stone)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

Sandstone

Arenite (SiO2 based with various mineral cements)

Chert (specifically Flint or Common Chert)

Microcrystalline Quartz (SiO2)

Milky Quartz (Water-worn pebble)

Quartz (Silicon Dioxide, SiO2)

Chert (and its variety Flint)

Silicon Dioxide (SiO2) - Microcrystalline or cryptocrystalline Quartz

Sandstone (with Liesegang rings or Oxidation)

Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)

Moss Agate / Carnelian Agate

Silicon Dioxide (SiO2) with iron and manganese inclusions

Serpentinite

Serpentinite (composed mainly of Group: Serpentine; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Limonite (Iron Stone Concretion)

Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O

Quartzite

Quartzite (primarily SiO2)

Chert (Quartz Pebble)

Silicon Dioxide (SiO2)

Jasper

Silicon dioxide (SiO2) with iron impurities

Chert (with Chalky Cortex)

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Rose Quartz

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

Sandstone (specifically Red Sandstone)

Arenite (SiO2 with Iron Oxide)

Turquoise (possible Dyed Howlite or Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (Turquoise)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Chrysoprase

Chrysoprase (a variety of Chalcedony, SiO₂)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Pyrite

Iron Sulfide (FeS2)

Yellow Quartzite

Quartzite (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite (River Cobble)

Quartzite (SiO2)

Red Sandstone (Old Red Sandstone)

Ferruginous Sandstone (SiO2 + Fe2O3)

Jasper (Mookaite style)

Silicon Dioxide (SiO2) with iron and manganese inclusions

Himalayan Salt

Halite (mineral name), chemical formula NaCl (sodium chloride). Generally, 'Himalayan Salt' is a trade name for evaporite minerals from specific regions.

Chert (variations include Flint/Jasper)

Cryptocrystalline Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide with trace elements (SiO2 + Ti, Fe, or Mn)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Rose Quartz

Quartz (Silicon Dioxide - SiO2)

Chert (Quartz)

Microcrystalline Silica (SiO2)

Aquamarine and clear quartz

Aquamarine (Be3Al2Si6O18), Quartz (SiO2)