Mineral, Often Found As A Rock (Metamorphic)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide with Iron and Titanium impurities)

Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Magnetite (potentially as a Lodestone or within Ironstone)

Magnetite (Fe3O4)

Gneiss

Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)

Green Aventurine (Green Quartzite)

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Gneiss (specifically a granitic gneiss cobble)

Gneiss (high-grade regional metamorphic rock)

Quartzite

Quartzite (primarily SiO2)

Wishing Stone with Quartz Vein

Hydrothermal Quartz Vein in Metasedimentary Matrix (primarily SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Jasper or Chert with Quartz Vugs

Silicon Dioxide (SiO2)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)

Red Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Muscovite Mica

Muscovite / KAl2(AlSi3O10)(OH)2

Agate

Agate (Silicon Dioxide, SiO2)

Schist (Chlorite or Mica-rich)

Chlorite Schist

Quartzite

Quartzite (Primary mineral: Silicon Dioxide, SiO₂)

River Quartz Pitting/Cobble

Silicon Dioxide (SiO2)

Quartz in Matrix (possibly with Biotite or Hornblende)

Quartz (Silicon Dioxide, SiO2) in Granitic Matrix

Epidosite (Epidote-rich rock)

Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Quartz (in a rock matrix)

Quartz (SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Yellow Jasper

Jasper (SiO2) with iron hydroxide inclusions

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Quartzite

Metamorphic Rock (Mainly SiO2)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Zebra Rock / Zebra Marble

Banded Limestone-Marble Transition

Phyllite

Phyllite (Foliated metamorphic rock)

Greenstone / Diabase Porphyry

Porphyritic Diabase (Micro-gabbro)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Gneiss

Gneiss (High-grade regional metamorphic rock)