Organic (Paper And Cellulose)

Banded Agate

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Chert (Polished Gemstone / River Stone)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Bull Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Desert Rose

Gypsum (variety Selenite) or Barite, CaSO4·2H2O

Chalcedony (Agate/Carnelian type)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milk/Citrine variety)

Silicon Dioxide (SiO2)

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Moonstone

Orthoclase Feldspar (KAlSi3O8)

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Yellow Quartzite (River Pebble)

Quartzite (SiO2)

Chert (specifically Tan/Gray Chert)

Microcrystalline quartz (SiO2)

Red Quartzite (River Stone)

Quartzite (primarily SiO2)

Aquamarine (Beryl)

Beryllium aluminum silicate (Be3Al2Si6O18)

Epidote in Quartz (Epidosite)

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Jasper

Quartz (SiO2) with impurities

Slate

Slate (Low-grade foliated metamorphic rock)

Chert (River Pebble)

Chert (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Rose Quartz

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

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Banded Flint (Chert)

Silicon Dioxide (SiO2)

Sandstone (with Iron Oxide)

Arenite with Limonite/Hematite staining

Sandstone

Clastic sedimentary rock (primarily SiO2)

Raw Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Red Sandstone

Arenite (primarily Quartz, SiO2, with Iron Oxide/Hematite)

Septarian Nodule (Septarian Dragon Stone)

Septarian Concretion (CaCO3 + Al2Si2O5(OH)4)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (with Iron Oxide)

Lapis Lazuli

Lapis lazuli (complex rock composed of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)

Citrine Quartz (likely heat-treated)

Silicon Dioxide (SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz

Silicon Dioxide (SiO2)

Riverstone Jasper (Chalcedony)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone

Sandstone (clastic sedimentary rock), primarily SiO2

Tiger's Eye (likely Hawk's Eye variant)

Pseudomorph of Quartz after Crocidolite (SiO2)