Not A Geological Specimen

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

White Salt Crystal Lamp (Halite)

Halite (Sodium Chloride, NaCl)

Anyolite (Ruby in Zoisite)

Zoisite with inclusions of Hornblende and Ruby (Ca2Al3(SiO4)3(OH))

Quartzite Beach Pebble

Quartzite (primarily SiO2)

Mookaite Jasper

Silicified Radiolarite (SiO2)

Clear Quartz / Rock Crystal

Silicon Dioxide (SiO2)

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Rose Quartz

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

Chert (specifically var. Flint or Jasper-rich Breccia)

Microcrystalline Quartz (SiO2)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Chert (Commonly known as Flint or Jasper when pigmented)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Dyed Blue Agate

Silicon Dioxide (SiO2)

Diamond (as featured in jewelry)

Diamond (C - pure carbon)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz (Rose or Milky variety fragment)

Silicon Dioxide (SiO2)

Chert (variations include Flint or Jasper)

Silicon Dioxide (SiO2)

Basalt (Gravel Pebble)

Basalt (contains pyroxene, plagioclase feldspar, and olivine)

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2)

Sandstone (Pebble/Cobble)

Arenite (primarily SiO2)

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Almandine Garnet in Schist

Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist

Azurite with Malachite

Azurite: Cu3(CO3)2(OH)2 / Malachite: Cu2CO3(OH)2

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F

Red Jasper (River Polished Quartzite)

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) impurities

Pink Opal

Hydrated Silica (SiO2·nH2O)

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Schist

Mica Schist (primarily consisting of muscovite, biotite, and quartz)

Epidote

Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)

Pegmatite with Smoky Quartz and Feldspar

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8)

Raw Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Quartz (likely milky quartz or a stained variety)

Silicon Dioxide (SiO₂)

Fossiliferous Limestone

Calcareous biomicrite / Calcium Carbonate (CaCO3)

Bumblebee Jasper

Calcite-Auripigment-Pyrite-Realgar assemblage (Carbonate/Sulphide mixture)

Pyrite (Iron Pyrite) with Goethite Oxidation

Iron Sulfide (FeS2)

Fossiliferous Limestone with Brachiopod Mold

Calcium Carbonate (CaCO3) matrix containing Brachiopoda fossil impressions

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with secondary mineral infilling)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Blue Lace Agate

Chalcedony (SiO2)

Blue Lace Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

Fossilized Brachiopod

Phylum Brachiopoda (replaced by Calcite/CaCO3)