Mineral With Metamorphic Or Sedimentary Host

Quartz with Mica Schist Matrix

Quartz (SiO2) in Mica Schist Matrix

Quartz Vein in Host Rock

Quartz (SiO2) in Mafic or Sedimentary Matrix

Garnet in Host Rock

Garnet Group (A3B2(SiO4)3)

Garnet Gneiss or Mica Schist with Garnet

Almandine Garnet-bearing Gneiss

Aura Quartz Bead

Silicon dioxide (SiO2) with metal coating

Chrysocolla on Matrix

Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)

Pyrite (on host rock)

Iron Sulfide (FeS2)

Quartz Vein in Host Rock

Hydrothermal Quartz (SiO2) in Slates/Schists

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Blue Kyanite

Kyanite (Al2SiO5)

Quartz Vein in Schist

Quartz-rich Micaceous Schist (SiO2 + phyllosilicates)

Agate (or Operculum / Fossil Shell)

Silicon Dioxide (SiO2)

Quartzite with Epidote Vein

Metamorphosed Quartz Sandstone with Hydrothermal Vein

Quartz geode or quartz-bearing rock

Quartz (SiO₂), likely in a chalcedony- or basalt-hosted cavity

Quartz-rich rock or quartz specimen

Quartz (SiO₂), likely massive quartz or quartz-bearing host rock

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Ruby (Pinkish-Red)

Corundum (Al2O3 with Chromium trace)

Pyrite in Slate

Iron Disulfide (FeS2) in Low-grade Metamorphic Rock

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Pink granite (likely weathered granite or granitic gneiss)

Granite; chiefly quartz (SiO₂), feldspar, and biotite/amphibole

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

Iron-rich quartz pebble

Quartz (SiO₂) with iron-oxide staining or inclusions; exact identification is uncertain from the photo

Quartz crystal-bearing rock

Quartz (SiO₂), likely a milky/clear quartz vein specimen

Almandine Garnet in Matrix

Almandine (Fe3Al2(SiO4)3)

Milky quartz-rich rock

Quartz, SiO₂; possibly quartzite or massive vein quartz

Milky quartz in weathered host rock

Quartz, SiO₂; likely a quartz vein in altered country rock

Garnet in Schist

Almandine Garnet in Mica-Schist (Fe3Al2(SiO4)3)

Quartz Vein in Siltstone

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Pyrite-bearing rock, likely pyrite schist or phyllite

Quartz–mica-rich metamorphic rock with disseminated pyrite (FeS₂); exact rock type cannot be confirmed from the image

Quartz vein in host rock

Quartz (SiO₂), likely milky quartz; host rock is uncertain from the photo

Wishing Stone

Greenschist or Basalt with Quartz/Calcite Vein

Schist, likely biotite–muscovite schist

Mica schist; predominantly quartz, feldspar, muscovite and biotite

Pyrite-bearing rock (likely pyrite in quartz or altered host rock)

Pyrite, FeS₂, intergrown with quartz and/or iron-rich matrix

Limonite after Pyrite (Prophecy Stone or Ironstone Concretion)

Goethite/Limonite pseudomorph after Pyrite/Marcasite (FeO(OH)·nH2O)

Rutilated Quartz

Rutile in Quartz (SiO2 with TiO2 inclusions)

Agate

Silicon dioxide (SiO2) - Microcrystalline Quartz

Milky quartz (likely quartz-rich rock)

Quartz, silicon dioxide (SiO₂)

White Quartz

Silicon Dioxide (SiO2)

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix