Mineral With Metamorphic Or Sedimentary Host

Milky quartz (with minor dark inclusions)

Quartz, silicon dioxide (SiO₂)

Quartz vein in host rock

Milky quartz (SiO₂) with likely metamorphic country rock, possibly gneiss or schist

Smoky Quartz with Hematite inclusions

Silicon Dioxide (SiO2) with Fe2O3 inclusions

Dendritic Agate or Manganese Nodule in Chert/Limestone

Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions

Gold-bearing quartz vein rock (probable pyrite-rich schist or quartzite)

Quartz (SiO₂) with iron sulfides, chiefly pyrite (FeS₂), and possible native gold

Wishing Stone (Basalt/Metabasalt with Quartz-Feldspar Vein)

Veined Metabasalt / Veined Greywacke

Likely dark green-black tumbled stone (possibly serpentine)

Unconfirmed; appearance is consistent with serpentine, a group of hydrated magnesium silicate minerals

Quartz Vein in Host Rock (often Granite or Schist)

Silicon Dioxide (SiO2) within host matrix

Serpentinite

Serpentinite (Hydrated magnesium iron silicate)

Septarian Nodule

Septarian Nodule (Calcite, Aragonite, and Limestone/Claystone)

Quartz with Mica

Silicon Dioxide (SiO2) with Mica group inclusions

Pyrite in Slate

Iron Sulfide (FeS2) in Slate host matrix

Likely rose quartz

Quartz (SiO₂), variety rose quartz

Lapis Lazuli

Complex metamorphic rock containing Lazurite ((Na,Ca)8(AlSiO4)6(SO4,S,Cl)2), Calcite, and Pyrite

Milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz with Pyrite

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Carnelian Agate Nodule

Chalcedony (SiO2) with Iron Oxide inclusions

Serpentine-rich serpentinite

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and chromite

Raw Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Red garnet crystal (possible almandine)

Garnet group; likely almandine, Fe₃Al₂(SiO₄)₃

Polished serpentine (likely bowenite/antigorite)

Serpentine-group minerals, chiefly antigorite or lizardite: Mg₃Si₂O₅(OH)₄

Exposed aggregate concrete (stone-chip surface)

Portland-cement concrete containing natural aggregate; not a natural rock

Quartz Geode in Sedimentary Host Rock

Silicon Dioxide (SiO2) in Carbonate Matrix

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Milky quartz (iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Emerald in Matrix

Beryl (Be3Al2Si6O18)

Quartz / Agate Nodule

Silicon Dioxide (SiO2)

Green-and-gold apatite-bearing rock, possibly epidote skarn

Apatite-group mineral, commonly fluorapatite (Ca₅(PO₄)₃F), with probable epidote and quartz; exact identification requires testing

Garnet (Almandine)

Almandine Garnet (Fe3Al2(SiO4)3)

Dendritic jasper/chalcedony

Silica-rich microcrystalline quartz (SiO₂) with manganese-oxide dendrites

Rough Ruby

Corundum (Al2O3 with Chromium impurities)

Quartz Vein in Siltstone

SiO2 (Quartz) on clastic sedimentary matrix

Garnet fragments

Garnet-group silicate, most likely almandine–pyrope or spessartine; composition varies, commonly (Fe,Mg,Mn)₃Al₂Si₃O₁₂

Jasper

Silicon dioxide (SiO2) with impurities

Iron-rich concretion or weathered limonite/goethite nodule

Limonite (hydrous iron oxides), commonly dominated by goethite (FeO(OH))

Milky Quartz in Shale

Silicon Dioxide (SiO2) in sedimentary host rock

Polished turquoise-matrix cabochon

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O, with iron-rich matrix and possible chrysocolla

Polished magnetite-rich ironstone (probable magnetite/hematite nodule)

Magnetite, Fe₃O₄, possibly mixed with hematite, Fe₂O₃, and iron-bearing gangue

Pyrite-bearing quartz vein fragment

Quartz (SiO₂) with pyrite (FeS₂), possibly minor chalcopyrite

Rough Gemstone Grains (Mixed Sapphires and Quartz)

Corundum (Al2O3) and Quartz (SiO2)

Quartz / Calcite Vein Rock

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)

Quartz (with Iron staining)

Silicon Dioxide (SiO2)