Mineral In Metamorphic Rock

Iron-stained quartz vein rock

Milky quartz (SiO₂) with limonite/goethite iron oxides, possibly in altered host rock

Fulgurite

Fulgurite (Lechatelierite)

Banded Gneiss with Quartz Vein

Gneiss (High-grade Regional Metamorphic Rock)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Greenstone / Quartzite Pebble

Metamorphosed Quartz-rich Rock

Rounded gray stone, likely slate or fine-grained sandstone

Probable slate (low-grade metamorphosed shale) or lithic sandstone; exact identification requires testing

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Quartz with Schist Inclusion

Quartz (SiO2) with micaceous schist inclusions

Quartz Pebble

Silicon Dioxide (SiO2)

Epidote-bearing Rock / Epidote Inclusion

Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock

Milky Quartz

Silicon Dioxide (SiO2)

Milky quartz with iron-oxide staining

Quartz, silicon dioxide (SiO₂), likely massive milky quartz

Quartz on Host Rock

Silicon Dioxide (SiO2)

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Pebble (Milky Quartz)

Silicon Dioxide (SiO2)

Purple Garnet

Magnesium Aluminum Silicate (Pyrope-Almandine series) Mg3Al2(SiO4)3

Fulgurite

Fulgurite (Lechatelierite)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Feldspathic Gneiss

Feldspathic Gneiss (High-grade regional metamorphic rock)

Schist (Micaceous Schist)

Schist (containing mainly Muscovite and Quartz)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite with Garnet

Garnetiferous Quartzite (SiO2 + X3Y2(SiO4)3)

Milky Quartz Pebbles

Silicon Dioxide (SiO2)

Limonite pseudomorph after pyrite

Goethite / Limonite pseudomorph after Pyrite (Fe3+O(OH) replacing FeS2)

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

Red Quartzite (Strawberry Quartz)

Quartzite (SiO2 with iron oxide inclusions)

Gneiss

Gneiss

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky and Bull Quartz)

Silicon Dioxide (SiO2)

Greenstone Pebbles (Basalt/Diabase)

Metamorphosed Mafic Rock (Greenstone)

Serpentine (variety: Serpentine Rock)

Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Iron-stained quartz-rich rock, possibly quartzite or hydrothermal quartz

Quartz (SiO₂), likely with iron oxides; exact host rock uncertain from the photograph

Quartz Vein on Matrix

Silicon Dioxide (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Siltstone or Fine-grained Sandstone pebble

Siltstone (primarily SiO2 with clay minerals)

Gneiss

Gneiss (High-grade Regional Metamorphism)

Quartzite

Quartzite (primarily SiO2)