Mineral Specimen

Zinc Alloy (Silver-plated)

Zinc Alloy Casting (Zn-Al-Mg-Cu)

Quartz Geode

Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity

Gneiss (Stream-worn Cobble)

Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica)

Basalt River Cobble

Basalt (Aphanitic Mafic Volcanic Rock)

Synthetic Resin Charm (Seal Shape)

Polymer Resin with plastic glitter / Polyethylene terephthalate glitters

Quartz

Silicon dioxide (SiO₂)

Shale or Slate with Quartz Veins

Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins

Pegmatite with Smoky Quartz and Feldspar

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8)

Chert (Polished Gemstone / River Stone)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Chert / Flint

Silicon dioxide (SiO2)

Chert Concretion (with typical hematite/limonite staining)

Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)

Fluorite

Calcium Fluoride (CaF2)

Biological Specimen (Domestic Dog)

Canis lupus familiaris

Chert with Desert Varnish

Cryptocrystalline Quartz (SiO2) with Manganese/Iron oxide coating

Quartz Sand Grain

Silicon Dioxide (SiO2)

Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).

Galena (PbS)

Granite (Pink/Red Granite)

Phaneritic Igneous Rock (primarily SiO2, KAlSi3O8, NaAlSi3O8)

Chert (Arrowhead Preform or Point)

Chert (Microcrystalline Quartz, SiO2)

Reddish Brown Claystone or Siltstone

Argillite / Siltstone / Claystone

Fossiliferous Chert (with Fossil Shells)

Silicon Dioxide (SiO2) with biogenic inclusions

Basalt

Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)

Druzy Quartz on Matrix

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Cryptocrystalline Quartz (SiO2)

Carnelian and White Quartz Bracelet

Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz

Healer's Gold (Pyrite and Magnetite in Schist)

Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Chert (specifically Jasper/Carnelian variety)

Microcrystalline quartz (SiO2)

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Green Chert (Jasper)

Silicon Dioxide (SiO2)

Healer's Gold (Pyrite/Magnetite in Serpentine)

Magnetite (Fe3O4) and Pyrite (FeS2) in Lizardite/Antigorite [Mg3Si2O5(OH)4]

Paper (Cellulose)

Cellulose (C6H10O5)n

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2) with impurities of Hematite or Goethite

Red Jasper (River Polished)

Silicon Dioxide (SiO2) with Hematite impurities

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (with Desert Varnish/Iron Stain)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Epidote in Quartz (Unakite-like specimen)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) in Quartz (SiO2)

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Prasiolite and Quartz Crystal Cluster

Quartz (SiO2); Prasiolite is a variety of Quartz

Ferruginous Quartzite (Red Sandstone/Quartzite)

Quartzite with Iron inclusions (SiO2 + Fe2O3)

Limestone

Calcium Carbonate (CaCO3)

Pink Quartzite

Quartzite (SiO2 with iron oxide impurities)