Mineral With Metamorphic Or Sedimentary Host

Pyrite in Host Rock

Iron Disulfide (FeS2)

Pyrite-bearing Rock

Iron Sulfide (FeS2) associated with host rock

Quartz pebble

Silicon dioxide (SiO2)

Pyrite-bearing rock, possibly pyrite schist or sulfide ore

Pyrite (iron disulfide, FeS₂), likely intergrown with dark metamorphic host minerals

Pyrite (likely)

Pyrite, FeS₂

Pyrite-bearing rock (likely pyrite-rich schist or sulfide ore)

Pyrite, FeS₂, dispersed in a dark metamorphic or hydrothermal host rock

Quartzite Geode or Crystalline Quartz Node

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz in Matrix

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Quartz-rich rock, likely milky quartz vein material

Mostly quartz (SiO₂); exact rock type cannot be determined from the image alone

Clear Quartz

Silicon dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite-bearing rock

Likely pyrite (FeS₂), possibly with quartz or other sulfide minerals

Metallic sulfide mineral specimen, likely pyrite

Pyrite (FeS₂), possibly a pyrite-rich sulfide aggregate

Polished green-inclusion stone, likely chlorite-included quartz

Quartz (SiO₂) with chlorite inclusions; exact identification is uncertain from the photograph

Blue Apatite

Apatite - Ca5(PO4)3(F,Cl,OH)

Weathered quartz-bearing rock, possibly calcite vein fragment

Indeterminate; likely quartz (SiO₂) with carbonate minerals such as calcite (CaCO₃)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Garnet in Schist/Gneiss Matrix

Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)

Small white mineral fragment

Likely quartz (SiO₂), possibly calcite (CaCO₃)

Milky Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Quartz with Schist Matrix

Crystalline Silicon Dioxide (SiO2) in micaceous schist

Quartz vein in host rock

Quartz (SiO₂) vein cutting an unidentified, likely metamorphic host rock

Quartz

Silicon dioxide (SiO2)

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

Clear Quartz

Silicon Dioxide (SiO2)

Wishing Stone (Quartz Vein in Greywacke / Basalt)

Quartz vein in host rock (e.g. Meta-basalt or Greywacke)

Pyrite in Matrix (Quartz/Schist)

Iron Sulfide (FeS2)

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Epidote with Quartz Vein

Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))

Magnetite (Lodestone)

Iron(II,III) oxide (Fe3O4)

Goethite pseudomorph after Pyrite

Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)

Banded Agate

Silicon Dioxide (SiO2)

Quartz (Milky or Druzy Quartz)

Silicon Dioxide (SiO2)

Pyrite-bearing rock (likely pyrite-rich ore)

Pyrite, FeS₂, in a fine-grained host rock

Unidentified small rock fragment

Likely quartz-rich material; exact identification is indeterminate from the image

Pyrite-bearing rock (likely pyrite-rich schist or quartzite)

Pyrite, FeS₂, disseminated in a metamorphic host rock