Mineral, Variety Of Quartz

Gneiss

Gneiss (a metamorphic rock)

Brown Jasper (Likely)

Jasper (Cryptocrystalline Silicon Dioxide - SiO2)

Gneiss (likely)

Gneiss

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Chert Nodule

Microcrystalline Quartz (SiO2)

Pyrite

Pyrite (FeS₂)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Tiger's Eye (Tumbled Blue/Black-Golden variety)

Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Granite

Granite (felsic intrusive igneous rock)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Rutilated Quartz

SiO2 with TiO2 inclusions (Quartz with Rutile)

Chert (Smooth River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Pink/Tan Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Arrowhead Artifact)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Quartz (specifically Clear and Rose Quartz)

Silicon Dioxide (SiO2)

Jasper and Quartz River Cobble

Silicon Dioxide (SiO2) with Hematite inclusions

Ferruginous Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)

Quartz Vein in Siltstone

SiO2 (Quartz) on clastic sedimentary matrix

Chert (Flint variety)

Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2

Jasper (Red Jasper)

Silicon Dioxide (SiO₂)

Chert (White Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz Vein with Iron Staining

Silicon Dioxide (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Granite

Granite (a felsic intrusive igneous rock)

Fluorite with Quartz coating

Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz with Chlorite inclusions

Silicon Dioxide (SiO2) with Chlorite group minerals

Pink Thulite (in Pumice-like texture)

Pink Zoisite (Mn-bearing Zoisite), Ca2Al3(SiO4)3(OH)

Chert (often called Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Red Jasper

Jasper (Silica with Hematite impurities), SiO2

Polished Jasper (Mushroom Carving)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chlorite (Small Flakes/Sand)

Chlorite Group (Magnesium Iron Aluminum Silicate Hydroxide - (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)

Epidote

Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Quartzite

Quartzite (primarily SiO2)