Sedimentary Or Igneous (Host Environment)

Smoky Quartz with Hematite inclusions

Silicon Dioxide (SiO2) with Fe2O3 inclusions

Fossilized Shark Tooth in Matrix

Otodus sp. (likely Otodus obliquus)

Biotite mica schist (probable)

Schist dominated by biotite mica; commonly quartz–feldspar–biotite

Gneiss (foliated metamorphic rock)

Gneiss

Gneiss (with Mica and Quartz)

Gneissic Metamorphic Rock

Dolomite or Limestone (Carbonate Rock)

CaMg(CO3)2 (Dolomite) or CaCO3 (Limestone / Calcite)

Garnet-bearing metamorphic rock, likely garnet schist or amphibolite

Almandine garnet (Fe₃Al₂Si₃O₁₂) in mica- or amphibole-rich matrix

Quartz (Milky or Cloudy variety)

Silicon Dioxide (SiO2)

Manganese Oxide Crust on Limestone

Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Blue Sapphire

Corundum (Al2O3 with trace Titanium/Iron)

Milky Quartz

Silicon Dioxide (SiO2)

Unidentified orange-brown rock fragment

Likely weathered iron-rich volcanic rock or ochre-bearing material; exact identification is impossible from the blurred image

Vesicular basalt (likely weathered lava rock)

Basalt; fine-grained mafic volcanic rock composed chiefly of plagioclase, pyroxene, and commonly olivine

Pink calcite (likely manganocalcite)

Calcite, CaCO₃; pink color commonly caused by manganese impurities

Carnelian

Carnelian (Chalcedony / SiO2)

Jasper with Quartz Vein

Microcrystalline quartz (SiO2) and chalcedony with a quartz vein

Chert (Nodular)

Microcrystalline Silica (SiO2)

Plume Agate

Silicon Dioxide (SiO2)

Quartz Vein in Sandstone

Sandstone with Hydrothermal Quartz (SiO2)

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Quartz vein in host rock (possibly milky quartz with iron-stained material)

Quartz, SiO₂, with an unidentified host rock and possible iron-oxide staining

Chert

Microcrystalline Quartz (SiO2)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Blue-and-white opalite sphere

Opalite (commercial synthetic or glass-based imitation; not true opal), typically silica glass or synthetic opalescent material

Raw garnet-rich metamorphic rock

Likely garnet-bearing schist or garnetite; garnet-group silicates, commonly almandine (Fe₃Al₂Si₃O₁₂)

Quartz vein fragment

Quartz (SiO₂), likely milky quartz with iron-oxide staining

Gneiss (River Cobble)

Metamorphic Gneiss

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Fossil oyster shell

Oyster (family Ostreidae), preserved as calcite/aragonite shell

Quartz geode

Quartz (SiO₂), lining a geode cavity; likely with minor iron-oxide staining

Botryoidal Chalcedony / Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Oxide Weathering

Silicon Dioxide (SiO2) with Goethite/Limonite coatings

Milky Quartz

Silicon Dioxide (SiO2)

Unidentified polished mineral specimen

Indeterminate; likely a pale feldspar or quartz-bearing material

Red Granite Pebble

Intrusive Felsic Igneous Rock (Granite)

Shale

Fissile Siliciclastic Sedimentary Rock

Chert Pebble with Quartz Vein

Microcrystalline Quartz (SiO2)

Gneissic River Cobble

Gneiss

Pyrite

Iron Sulfide (FeS2)

Labradorite (a variety of Feldspar)

Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)