Antropogenic (Man Made Material)

Nuummite

Orthoamphibole (Anthophyllite-Gedrite composition)

Clear Quartz

Silicon Dioxide (SiO2)

Orange Quartzite / Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone (Quartzose)

Arenite (SiO2 based)

Fire Opal (in matrix)

Hydrated Silica (SiO2·nH2O)

Milky and Ferruginous Quartz

Silicon Dioxide (SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Limestone

Calcareous sedimentary rock (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Olivine (Peridotite)

Magnesium iron silicate (Mg, Fe)2SiO4

Sandstone

Sandstone (Sedimentary rock composed of silicate grains)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (primarily SiO2)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Sandstone (with potential iron-oxide weathering)

Arenite (SiO2 based)

Sandstone (Ferruginous)

Arenite with Iron Oxides

Yellow Quartzite Pebble

Quartzite (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Iron Meteorite

Siderite (Iron-Nickel Meteorite)

Chert (often called Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartzite River Rock (with Quartz Vein)

Quartzite (SiO2)

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Chert (Nodular Flint)

Microcrystalline Quartz (SiO2)

Yellow Ochre / Limonite

Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Sandstone

Arenite

Chert (Flint)

Chert (SiO2)

Chert (often called Flint or Jasper based on color)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Chert / Flint

Silicon Dioxide (SiO2)

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)

Chert (and Fossilized Brachiopod shell)

Sedimentary Cryptocrystalline Quartz (SiO2)

Drupa Quartz (Sparkly Drusy Quartz on Matrix)

Crystalline Silicon Dioxide (SiO2) on host rock

Limonite (Iron Ore)

Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)

Chert (Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Common Opal/Chalcedony mixture)

Silicon Dioxide (SiO2)

Dalmation Stone (Dalmation Jasper)

Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)

Chert (Jasper)

Silicon dioxide (SiO2)

Scoria

Scoria (a vesicular basalt or andesite)

Geode (Unopened)

Silica-rich Concretion (primarily SiO2)

Textile (Upholstery Fabric)

Woven Polyethylene/Polyester or Cotton Blend