Mineraloid (Human Made Geological Specimen)

Unakite (Epidotized Granite)

Epidotized Granite

Rose Quartz

Silicon Dioxide (SiO2) containing trace amounts of titanium, iron, or manganese

Quartz Geode

Silicon Dioxide (SiO2) in Host Rock

Chert

Chert (SiO2)

Fossiliferous Limestone

Calcite-rich Sedimentary Rock (CaCO3)

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Sandstone Concretion

Ferruginous Sandstone Concretion

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Milky Quartz

Silicon Dioxide (SiO2)

Basalt (Weathered River Stone)

Basalt (Extrusive Mafic Igneous Rock)

Pink Quartzite

Quartzite (primarily SiO2)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (Jasper variation)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Quartz (Clear/Smoky Geode fragment)

Silicon Dioxide (SiO2)

Unakite

Unakite (an altered granite composed of Epidote, Orthoclase, and Quartz)

Unakite (Epidotized Granite)

Unakite (Rock composed of Epidote Ca2(Al,Fe)3(SiO4)3(OH), Orthoclase KAlSi3O8, and Quartz SiO2)

Quartz (Milky and Bull Quartz)

Silicon Dioxide (SiO2)

Fossil Bivalve Shell

Class Bivalvia (e.g., Veneriidae family)

Brachiopod Fossil

Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Gold Ore in Quartz/Schist

Auriferous Quartz and Sulfide-bearing Schist

Greenschist (Greenstone River Pebble)

Greenschist (Chlorite Schist)

Quartz (chalcedony variety) or Limestone with Quartz Veins

SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Ironstone Concretion (Limonite/Hematite Nodules)

Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Gneiss with Quartz Veining

Gneiss (High-grade regional metamorphic rock)

Pyrite

Iron Disulfide (FeS2)

Arsenopyrite

Arsenopyrite (FeAsS)

Schist

Schist (various mineral compositions)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Amethyst Quartz (Tumbled)

Amethyst (Silicon Dioxide with iron impurities, SiO2)

Mica Schist with Garnet

Garnetiferous Mica Schist

Quartz (Common or Milky)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)