Mineral Specimen

Hematite

Iron(III) oxide (Fe2O3)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Quartz River Pebble

Quartz (Silicon Dioxide, SiO2)

Glaucophane / Blueschist

Glaucophane (Na2Mg3Al2Si8O22(OH)2)

Jasper

Cryptocrystalline Quartz (SiO2)

Malachite-bearing copper ore

Malachite, Cu₂CO₃(OH)₂, likely mixed with chrysocolla, copper minerals, and iron oxides

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Gabbro (likely with Pyrite/Sulfide mineralization)

Mafic Intrusive Igneous Rock

Native Silver Nugget

Silver (Ag)

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Moqui Marble

Hematite-Goethite Concretion

Ferruginous Quartz (Iron-Stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Sandstone (likely Quartzite-grade)

Arenite (primarily SiO2)

Pyrite (Tumbled)

Iron Disulfide (FeS2)

Tumbled jasper (likely picture jasper or iron-rich jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

Dendritic Chalcedony (Agate)

Cryptocrystalline Quartz (SiO2)

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Fossilized Bone Chunk (likely Dinosaur or Large Mammal)

Permineralized Fossil Bone

Rose Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Chert (Flint Nodules)

Microcrystalline Quartz (SiO2)

Blue Lace Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

Blue Lace Agate

Chalcedony (SiO2)

Aquamarine (Beryl)

Beryllium aluminum silicate (Be3Al2Si6O18)

River Cobble (Quartzite / Granitic Gneiss)

Metamorphic Quartzite / Granitic Gneiss

Quartz Pebble (with Iron Inclusions)

Silicon Dioxide (SiO2)

Granite Pebble

Granite (Plutonic Igneous Rock)

Agate (Polished Slice)

Banded Chalcedony (SiO2)

Likely polished basalt with pale mineral inclusions

Basalt; inclusions possibly calcite, quartz, or weathered feldspar

Sandstone with Iron Staining

Arenite (SiO2 with Fe-oxide coatings)

Quartzite with inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Jasper with Dendritic Inclusions

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Milky Quartz Mushroom Carving

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Likely basalt with a pale mineral-filled vesicle

Vesicular basalt, probably containing calcite or zeolite (uncertain from image)

Tumbled amethyst

Quartz, SiO₂; purple variety colored mainly by trace iron and irradiation

Rainbow aura quartz cluster

Quartz, silicon dioxide (SiO₂), artificially coated with a thin metallic film

Amethyst quartz cluster

Quartz, SiO₂; purple color caused mainly by iron-related defects and irradiation

Quartz (Milky/Clear Quartz)

Silicon Dioxide (SiO2)

Amethyst

Silicon dioxide with iron impurities (SiO2 + Fe3+)

Amazonite

K(AlSi3O8) - Potassium Aluminum Silicate (Triclinic)

Ferruginous Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions