Mineral Specimen

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Quartz River Pebble

Quartz (Silicon Dioxide, SiO2)

Malachite-bearing copper ore

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

Jasper

Cryptocrystalline Quartz (SiO2)

Glaucophane / Blueschist

Glaucophane (Na2Mg3Al2Si8O22(OH)2)

Native Silver Nugget

Silver (Ag)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Gabbro (likely with Pyrite/Sulfide mineralization)

Mafic Intrusive Igneous Rock

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone (likely Quartzite-grade)

Arenite (primarily SiO2)

Pyrite (Tumbled)

Iron Disulfide (FeS2)

Moqui Marble

Hematite-Goethite Concretion

Dendritic Chalcedony (Agate)

Cryptocrystalline Quartz (SiO2)

Ferruginous Quartz (Iron-Stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Fossilized Bone Chunk (likely Dinosaur or Large Mammal)

Permineralized Fossil Bone

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

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

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

Rose Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Chert (Flint Nodules)

Microcrystalline Quartz (SiO2)

Likely basalt with a pale mineral-filled vesicle

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

Blue Lace Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

Blue Lace Agate

Chalcedony (SiO2)

Quartz Pebble (with Iron Inclusions)

Silicon Dioxide (SiO2)

Granite Pebble

Granite (Plutonic Igneous Rock)

Agate (Polished Slice)

Banded Chalcedony (SiO2)

Aquamarine (Beryl)

Beryllium aluminum silicate (Be3Al2Si6O18)

River Cobble (Quartzite / Granitic Gneiss)

Metamorphic Quartzite / Granitic Gneiss

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)

Jasper with Dendritic Inclusions

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartzite with inclusions

Metamorphosed Quartz-rich Rock (SiO2)

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

Amazonite

Amazonite (K[AlSi3O8])

Amazonite

Microcline (var. Amazonite) - KAlSi3O8

Rose Quartz with Oxide Inclusions

Silicon Dioxide (SiO2)