Mineral With Artificial Coating

Blue Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Bismuth Crystal

Bismuth (Bi)

Carnelian Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

Dyed Pink Quartzite

Tumbled and Dyed Quartzite (SiO2 with dye treatment)

Iron-stained quartz-rich rock

Likely ferruginous quartzite or iron-oxide-stained quartz; exact identification is uncertain from the photo

Polished, carved gemstone (possibly dyed agate or glass-like material)

Unconfirmed from the image; no specific mineral can be identified reliably

Smoky Quartz

Silicon Dioxide (SiO2)

Uncertain fine-grained rock or mineral-bearing specimen

Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains

Blue-dyed howlite beads (likely)

Howlite, Ca₂B₅SiO₉(OH)₅, commonly dyed blue to imitate turquoise

Dyed Agate

SiO2 (Silicon Dioxide)

Dyed Agate

Chalcedony (SiO2 with impurities)

Limonite (Ironstone)

Hydrated Iron Oxide (FeO(OH)·nH2O)

Tumbled blue-green chalcedony (likely dyed agate or chrysoprase)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Smoky Quartz

Silicon Dioxide (SiO2)

Mixed rock and mineral collection

Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials

Red Dyed Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Dalmation Stone (Dyed)

Peralkaline rhyolite

Red Tiger's Eye

Pseudomorph of Quartz after Crocidolite (Silicon Dioxide: SiO2)

Quartz Druzy (Geode Fragment)

Silicon Dioxide (SiO2)

Pink Dyed Agate (Banded Chalcedony)

Silicon dioxide (SiO2) - variety Chalcedony

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Black drusy mineral coating, possibly hematite or manganese oxide

Undetermined; likely microcrystalline hematite (Fe₂O₃) or manganese oxides such as pyrolusite (MnO₂)

Clear Quartz (Milky Quartz pebble)

Silicon Dioxide (SiO2)

Olivine (Peridot)

Olivine Group (Magnesium Iron Silicate), (Mg, Fe)2SiO4

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial purple dye

Dyed Pink Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial dye additives

Chert (with Quartz vein/coating)

Microcrystalline Quartz (SiO2)

Prasiolite

Silicon Dioxide (SiO2) with iron impurities

Dyed Agate

SiO2 (Chalcedony/Agate)

Dyed Tumbled Quartz

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO2)

Quartz (Citrine variety)

Silicon Dioxide (SiO2)

Tumbled Quartz

Silicon Dioxide (SiO2)

Banded Slag Glass (Leland Blue/Frankfort Green style)

Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)

Blue Lace Agate

Chalcedony (SiO2) with trace impurities

Lemon Quartz

Silicon Dioxide (SiO2)

Dyed Agate

SiO2

Dyed Agate

Agate (Silicon Dioxide, SiO2)

Mixed mineral specimens, prominently chalcopyrite and amethyst

Chalcopyrite (CuFeS₂) with secondary copper minerals; amethyst, purple quartz (SiO₂)

Tumbled orbicular granite

Orbicular granite, composed mainly of quartz, feldspar, and mica/amphibole

Lemon Quartz

Silicon Dioxide (SiO2)