Obsidian (specifically Mahogany Obsidian) rock specimen

Obsidian (specifically Mahogany Obsidian)

Volcanic glass (high silica content, SiO2)

igneous

Jasper rock specimen

Jasper

Jasper (Cryptocrystalline Quartz, SiO2)

sedimentary

Quartz (Milky or Common Quartz) rock specimen

Quartz (Milky or Common Quartz)

Silicon Dioxide (SiO2)

mineral

Quartz (Iron-Stained) rock specimen

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

mineral

Fuchsite in Quartz rock specimen

Fuchsite in Quartz

K(Al,Cr)2(AlSi3O10)(OH)2 (Muscovite with Chromium)

metamorphic

Agate Nodule (partially vuggy Quartz) rock specimen

Agate Nodule (partially vuggy Quartz)

Silicon Dioxide (SiO2)

Mineral/Sedimentary

Chert (varieties: Flint or Jasper) rock specimen

Chert (varieties: Flint or Jasper)

Microcrystalline Quartz (SiO2)

sedimentary

Chert (specifically Flint or Jasper-Chert) rock specimen

Chert (specifically Flint or Jasper-Chert)

Silicon Dioxide (SiO2)

sedimentary

Conglomerate rock specimen

Conglomerate

Clastic sedimentary rock (Psephite)

sedimentary

Quartzite rock specimen

Quartzite

Quartzite (primarily SiO2)

metamorphic

Quartzite rock specimen

Quartzite

Quartzite (primarily SiO2)

metamorphic

Granite rock specimen

Granite

Phaneritic Felsic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)

igneous

Turquoise (Rough) rock specimen

Turquoise (Rough)

Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

mineral

Quartzite River Pebbles rock specimen

Quartzite River Pebbles

Quartzite (primarily SiO2)

Metamorphic

Quartz pebble with surface markings rock specimen

Quartz pebble with surface markings

Silicon Dioxide (SiO2)

mineral

Quartz (Iron-stained or Milky Quartz) rock specimen

Quartz (Iron-stained or Milky Quartz)

Silicon Dioxide (SiO2)

mineral

Sandstone (Painted) rock specimen

Sandstone (Painted)

Arenite (primarily SiO2)

sedimentary

Sandstone rock specimen

Sandstone

Clastic sedimentary rock (primarily SiO2)

sedimentary

Rose Quartz rock specimen

Rose Quartz

Silicon dioxide with traces of titanium, iron, or manganese (SiO2)

mineral

Sandstone (likely Arkose) rock specimen

Sandstone (likely Arkose)

Arenite (Feldspathic Sandstone / Arkose)

sedimentary

Quartzite rock specimen

Quartzite

Quartzite (primarily SiO2)

metamorphic

Ferruginous Quartz rock specimen

Ferruginous Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

mineral

Slag Glass rock specimen

Slag Glass

Vitreous Silicate Residue

industrial byproduct (anthropogenic rock)

Sandstone (Quartzose) rock specimen

Sandstone (Quartzose)

Arenite (SiO2 principal)

sedimentary

Gneiss (with Quartzite and Biotite) rock specimen

Gneiss (with Quartzite and Biotite)

Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)

metamorphic

Mica Schist with Iron Staining rock specimen

Mica Schist with Iron Staining

Mica Schist

metamorphic

Granite rock specimen

Granite

Phaneritic Plutonic Felsic Rock (major components: SiO2 and Al2O3)

igneous

Gneiss (with Mica and Quartz) rock specimen

Gneiss (with Mica and Quartz)

Gneissic Metamorphic Rock

metamorphic

Quartzite rock specimen

Quartzite

Quartzite (SiO2)

metamorphic

Quartzite rock specimen

Quartzite

Quartzite (SiO2)

metamorphic

Granite rock specimen

Granite

Granite (Felsic Plutonic Rock)

igneous

Sandstone (likely Greywacke or Lithic Sandstone) rock specimen

Sandstone (likely Greywacke or Lithic Sandstone)

Arenite / Wacke

sedimentary

Smoky Quartz rock specimen

Smoky Quartz

Silicon Dioxide (SiO2)

mineral

Quartzite rock specimen

Quartzite

Quartzite (primarily SiO2)

metamorphic

Red Jasper rock specimen

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary

Amethyst rock specimen

Amethyst

Amethyst (variety of Quartz, SiO2)

mineral

White Jade (Nephrite) rock specimen

White Jade (Nephrite)

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

metamorphic

Howlite rock specimen

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

mineral

Titanium Aura Quartz rock specimen

Titanium Aura Quartz

Titanium bonded Silicon Dioxide (SiO2 + Ti)

mineral

River Pebble (Quartzite/Chert) rock specimen

River Pebble (Quartzite/Chert)

Quartzite with inclusions (SiO2)

metamorphic

Unakite rock specimen

Unakite

Unakite (Epidotized Granite)

metamorphic

Amber rock specimen

Amber

Succinite

Organic Mineral