Purple Chalcedony (likely dyed Agate)
Silicon Dioxide (SiO2)
Category
Browse metamorphic, likely sedimentary with quartz veins specimens identified by the Rock Identifier community.
Purple Chalcedony (likely dyed Agate)
Silicon Dioxide (SiO2)
Quartzite
Quartzite (primarily SiO₂)
Greisen
Greisen
Gneiss
Gneiss
Citrine Quartz
Quartz (SiO2) - specifically, a variety of macrocrystalline quartz
Pyrite
Iron Sulfide (FeS2)
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in Rhyolitic Matrix
Quartzite Beach Pebble
Quartzite (primarily SiO2)
Fossilized Shark Tooth (Dermal Denticle or worn tooth fragment)
Elasmobranchii (fossil remains)
Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Chalcedony on Matrix
Silicon Dioxide (SiO2)
Amazonite
Amazonite (KAlSi3O8) - a variety of Microcline Feldspar
Quartz-Veined Mudstone
Argillaceous Mudstone with Quartz Veining
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
Yellow Chalcedony (likely carnelian or yellow agate)
Silicon Dioxide (SiO₂)
Quartzite River Rock (with Limonite staining)
Quartzite (SiO2)
Quartz (Smoky/Milky Pebble)
Silicon Dioxide (SiO2)
Blue Sapphire (likely costume glass imitation)
Corundum (Al2O3) with iron/titanium impurities
Quartz (with inclusions / Sandstone fragment)
Silicon Dioxide (SiO2)
Jasper (likely a variety of Brecciated Jasper or a patterned variety)
Silicon dioxide (SiO2)
Gneiss
Gneiss (High-grade metamorphic rock)
Diamond Drill Core (Greenschist and Quartzite)
Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)
Quartz with Mica inclusions (Pegmatite)
Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions
Gneiss
Gneiss
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Banded Gneiss
Gneiss
Gneiss (specifically a water-worn pebble)
Gneiss
Gold
Native Gold (Au)
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
Pyrite
Iron Sulfide (FeS2)
Rhodonite
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
Basalt with Epidote Veins
Mafic Igneous Rock (Basalt)
Rose Quartz
Rose Quartz (SiO₂)
Citrine
Citrine (Silicon Dioxide, SiO2)
Quartz (milky quartz variety)
Quartz (SiO₂)
Gold Nugget
Native Gold (Au)
Gold Ore
Native Gold (Au)
Red Jasper (Chert)
Silicon Dioxide (SiO2)
Amethyst
Silicon Dioxide (SiO2) with trace Iron (Fe) impurities
Amethyst
Amethyst (Silicon Dioxide with iron impurities, SiO2)
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
Quartzite River Rock
Quartzite (primarily SiO2)