Mineralological Specimen

Blue topaz-style pendant (stone identity uncertain)

Possibly blue topaz (Al₂SiO₄(F,OH)₂); the image cannot confirm whether the stone is natural or synthetic

Blue topaz-style pendant gemstone

Likely blue topaz (Al₂SiO₄(F,OH)₂); the image cannot confirm the stone or whether it is natural or synthetic.

Polished smoky quartz pendant (probable)

Quartz, SiO₂; smoky variety

Vein Quartz in Basalt or Mafic Rock

Silicon Dioxide (Quartz veins in volcanic host rock)

Agate

Silicon Dioxide (Chalcedony), SiO2

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Iron-Stained Quartz

Silicon Dioxide with Iron Oxide (SiO2 with Fe2O3)

Jasper

Microcrystalline Quartz (SiO2)

Carnelian

SiO2 (Silicon dioxide)

Brachiopod Fossil in Sedimentary Rock

Phylum Brachiopoda fossil imprint in sedimentary matrix

Sandstone Concretion

Sedimentary Concretion (Quartz sand bound by mineral cement)

Quartz in Greenstone

Metamorphic rock with quartz vein (SiO2 / mixed silicates)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Generic Rock Fragment

Rock Fragment

Jasper

Microcrystalline Quartz (SiO2)

Quartz-veined Basalt or Limestone Pebble

Quartz vein in host rock (Silicate mineral in carbonate or volcanic matrix)

River Cobble (Basaltic/Andesitic)

Mafic to Intermediate Volcanic Rock

Moss Agate

Silicon dioxide (SiO2) with inclusions

Quartzite Beach Pebble (with Quartz Vein)

SiO2 (Quartzite)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Chert (Common Opal/Chalcedony)

Microcrystalline Quartz (SiO2)

Weathered iron-rich chert or ferruginous quartzite

Microcrystalline quartz (SiO₂), stained/coated by iron oxides such as goethite and hematite

Pegmatitic quartz–feldspar–mica rock

Granitic pegmatite, composed mainly of quartz (SiO₂), feldspar, and black mica (biotite); possible accessory tourmaline or schorl

Jasper

Microcrystalline Quartz (SiO2)

Fossilized marine shell fragment

Likely a bivalve or gastropod shell preserved as calcite (CaCO₃)

Dyed Agate

SiO2

Likely quartzite

Quartzite, composed predominantly of quartz (SiO₂)

Chert Nodule (Flint)

Silicon Dioxide (SiO2)

Cubic Zirconia

Cubic Zirconium Dioxide (ZrO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Gneiss

Foliated quartz–feldspar gneiss, likely biotite-bearing

Likely weathered metamorphic rock (possibly schist or gneiss)

Indeterminate; probable mica-rich quartz–feldspar metamorphic rock

Rounded gray-green stone, likely fine-grained sandstone or siltstone

Indeterminate clastic sedimentary rock; exact identification requires closer examination

Smoky Quartz (with Druzy/Polished Edge)

Smoky Quartz (Silicon Dioxide, SiO2)

Weathered iron-rich rock, possibly limonite-bearing basalt or ironstone

Indeterminate; likely basaltic or ferruginous rock containing iron oxides/hydroxides such as hematite (Fe₂O₃) and limonite/goethite

Small pink-red mineral fragment, possibly ruby or corundum

Corundum (Al₂O₃), unconfirmed; visual identification is uncertain

Iron-stained chert (possible jasper)

Microcrystalline quartz (SiO₂), likely iron-oxide stained

Unknown small pale rock fragment

Unidentified light-colored granular mineral aggregate; likely quartz-rich material or limestone

Rutilated quartz (likely a cabochon set in metal)

Quartz, SiO₂, containing rutile inclusions (TiO₂)

Blue halite (rock salt)

Halite (NaCl)

Gypsum (likely selenite/alabaster)

Gypsum, CaSO₄·2H₂O