Mineral, Often Found As A Rock

Variscite in Matrix

Variscite (AlPO4 · 2H2O)

Quartzite (River Pebble)

Metamorphic Quartzite (SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Chert (Jasper/Chalcedony)

Microcrystalline Silica (SiO2)

Chert (Jasper variation)

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Sandstone

Arenite (SiO2 dominant)

Quartzite (Yellow/Tan)

Metamorphic Rock composed of Quartz (SiO₂)

Chalcopyrite

Chalcopyrite (CuFeS2)

Chert (Chalcedony/Flint)

Silicon Dioxide (SiO2)

Unakite

Epidotized Granite

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Peridot

Olivine ((Mg,Fe)2SiO4)

Milky Quartz

Silicon Dioxide (SiO2)

Chert Pebble Map

Microcrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Quartzite Pebbler

Quartzite (primarily SiO2)

Snowflake Obsidian

Vitreous volcanic silicate rock (SiO2) with Spherulite inclusions

Chert (specifically Iron-stained River Cobble)

Silicon Dioxide (SiO2)

Milky Quartz with Country Rock contact

Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock

Olivine (Peridot when gem-quality)

Olivine Group (Magnesium Iron Silicate, (Mg,Fe)2SiO4)

Chert (or Flint)

Chert (cryptocrystalline quartz), SiO2

Nephrite Jade

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

Lapis Lazuli

Lazurite-dominant Metamorphic Rock (complex aluminosilicate)

Chert (specifically Flint or Dark Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2) with various iron-oxide inclusions

Chert (often called Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert

Microcrystalline Quartz (SiO2)

Chert / Flint

Chert (Cryptocrystalline Silica, SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within metamorphic/igneous matrix

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2 (Calcium magnesium iron silicate hydroxide)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (predominantly SiO2)

Massive Quartz (Milky or Gray)

Silicon Dioxide (SiO2)

Banded Agate (Botswana Agate)

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Fe3O4)

Quartzite pebble

Metamorphic rock (mainly SiO2)

Not a geological specimen

N/A (man-made object)

Chert (Yellow/Tan)

Microcrystalline Quartz (SiO2)

Chert (often called Flint or Jasper if reddish)

Microcrystalline Quartz (SiO2)

Basalt with Granite Inclusions (Xenoliths)

Mafic igneous rock (Basalt) with Sialic minerals