Mineral With Metamorphic Or Sedimentary Host

White quartz in dark matrix (likely quartz-bearing breccia or polished composite specimen)

Quartz, SiO₂, in an unidentified dark silicate matrix

Schorl (Black Tourmaline)

Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)

Yellow Quartz Pebble

SiO2 (Silicon Dioxide) with Iron Impurities

Milky Quartz

Silicon Dioxide (SiO2)

Tumbled red jasper

Jasper, microcrystalline quartz (SiO₂), commonly colored by iron oxides

Druzy Quartz on Sandstone

Silicon Dioxide (SiO2) on Sedimentary Host Rock

Tumbled carnelian (red chalcedony)

Carnelian, a microcrystalline variety of quartz; SiO₂, commonly colored by iron oxides

Milky quartz (likely quartz-rich rock)

Quartz, silicon dioxide (SiO₂)

Milky quartz cluster

Quartz (silicon dioxide, SiO₂)

Yellow Agate

Silicon Dioxide (SiO2)

Smoky Quartz Cluster

Smoky Quartz (Silicon Dioxide - SiO2)

Blue Sapphire

Corundum (Al2O3 with iron and titanium trace elements)

Ruby (Rough/Raw)

Corundum (Al2O3:Cr)

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)

Quartz (Milky or Cloudy variety)

Silicon Dioxide (SiO2)

Quartz Geode or Druzy Quartz on Matrix

Silicon Dioxide (SiO2)

Blue apatite (likely dyed or enhanced)

Apatite group; fluorapatite, Ca5(PO4)3F, is the common blue variety

Quartz Vein in Host Rock

Silicon dioxide (SiO2) veins in metamorphic/igneous host rock

Milky quartz-rich rock

Quartz, silicon dioxide (SiO₂), likely massive milky quartz with iron-oxide or feldspar impurities

Milky quartz-rich vein rock

Quartz, SiO₂, likely massive or microcrystalline quartz

Orange chalcedony / carnelian

Microcrystalline quartz (SiO₂), likely iron-colored chalcedony (carnelian)

Calcite in Matrix

Calcium Carbonate (CaCO3) on Sedimentary Host Rock

Quartz-bearing rock fragment

Likely quartz (SiO₂) with iron-oxide staining and possible feldspar/matrix minerals

Tiny rounded metallic-looking pebble, possibly pyrite or a metal-rich mineral

Uncertain from image; possible pyrite (FeS₂), chalcopyrite (CuFeS₂), or magnetite (Fe₃O₄)

Metallic sulfide-bearing pebble, likely pyrite in quartz or host rock

Probable pyrite (FeS₂), possibly with chalcopyrite (CuFeS₂) in a quartz-rich matrix

Garnet

Almandine formula: Fe3Al2(SiO4)3

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Clear quartz chips

Quartz (silicon dioxide, SiO₂)

Sandstone Concretion

Carbonate-cemented Sandstone Concretion

Fluorite on Matrix

Calcium Fluoride (CaF2)

Lapis lazuli

Lapis lazuli; primarily lazurite (Na₃Ca(Si₃Al₃)O₁₂S), with calcite and pyrite

Quartz vein rock (milky quartz)

Milky quartz, SiO₂; likely quartz-rich vein material in altered host rock

Garnet-bearing metamorphic rock, possibly garnet amphibolite or mica schist

Almandine garnet (Fe₃Al₂Si₃O₁₂) in a mafic, amphibole–feldspar-rich matrix

Serpentinite (likely)

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and minor chlorite/talc

Titanium Quartz (Aura Quartz)

Silicon Dioxide (SiO2) treated with Titanium

Lapis Lazuli

Complex rock primarily containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Polished jasper slab

Jasper, an opaque microcrystalline variety of chalcedony (SiO₂), colored mainly by iron oxides

Polished multicolored gemstone, likely boulder opal

Opal, hydrated amorphous silica (SiO₂·nH₂O), possibly ironstone matrix

Magnetite-rich ironstone (probable magnetite ore)

Magnetite, Fe₃O₄, likely in a fine-grained ironstone matrix

Agate Nodule / Chalcedony

Silicon Dioxide (SiO2)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Quartz/Schist

Epidote

Epidote (Ca2(Al, Fe)3(SiO4)3(OH))