Mineral With Artificial Coating

Sea Glass

Man-made silicate glass

Dyed Agate

SiO2

Polished pink gemstone, likely dyed quartz or chalcedony

Uncertain from image; possibilities include dyed quartz (SiO₂) or chalcedony (microcrystalline SiO₂)

Dyed or coated quartz geode

Quartz geode; silicon dioxide (SiO₂), likely artificially color-enhanced

Blue Howlite (Dyed)

Dyed Howlite (Calcium Borosilicate Hydroxide, Ca2B5SiO9(OH)5)

Dyed Crackle Quartz/Agate (resembling Watermelon Tourmaline)

SiO2 (Silicon Dioxide)

Polished dark stone, likely basalt

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, with possible olivine and magnetite

Agate (Dyed) or composite stone

SiO2

Weathered sandstone

Quartz-rich clastic sandstone, chiefly SiO₂ with minor feldspar, lithic grains, and iron-oxide/clay cement

Tumbled pink quartz, likely dyed

Quartz (silicon dioxide, SiO₂), probably artificially colored chalcedony or milky quartz

Mystic Topaz (Treated Quartz or Topaz)

Silicate Mineral (SiO2 or Al2SiO4(F,OH)2) with Titanium coating

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Turquoise (Dyed Howlite/Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (Target mineral) / Ca2B5SiO9(OH)5 (Actual specimen: Howlite)

Limonite/Goethite on Shale

Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock

Asphalt Conglomerate

Artificial Bituminous Conglomerate

Beads (likely glass or man-made material)

N/A (artificial material)

Tangerine Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite coatings

Dyed Blue Agate Geode Slice

Chalcedony (Silicon Dioxide, SiO2)

Dyed Agate

SiO2

Dyed Quartz Crystals

Silicon Dioxide (SiO2) with artificial pigment

Dyed pink howlite (tumbled stone)

Howlite, Ca₂B₅SiO₉(OH)₅; likely dyed to imitate pink turquoise or rhodonite

Tumbled purple stone, possibly lepidolite-bearing rock or dyed quartzite

Uncertain from image; possible quartz (SiO₂) with purple mica, or artificially dyed silicate

Red coral (likely precious coral)

Corallium sp.; calcium-carbonate skeleton, primarily calcite

Likely native silver-bearing ore or silver-colored metallic mineral specimen

Uncertain from the photo; possible native silver (Ag) with iron-oxide-stained host rock

Unidentified dark pebble

Undetermined; possibly polished basalt, chert, or iron-rich stone

Dyed Quartz

Silicon Dioxide (SiO2)

Fluorite with Quartz coating

Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

Blue Goldstone

Goldstone (artificial glass)

Likely dyed or painted stone

Unidentified natural rock; vivid purple, orange, and pink coloration appears to be a surface coating or pigment, so the underlying rock cannot be reliably identified from the image.

Druzy Chalcedony/Quartz on Fluorite core

Silicon Dioxide (SiO2) on Calcium Fluoride (CaF2)

Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Pet Rock (Quartzite/Sandstone River Rock)

Silicon Dioxide (SiO2) mixture

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Chakra Stone (Composite / Man-made Bonded Gemstones)

Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)

Red sandstone pebble

Quartz-rich sandstone, commonly ferruginous sandstone (SiO₂-dominated)

Worry Stone

Weathered Quartzite or Sandstone

Dyed Quartz Cube

Silicon Dioxide (SiO2)

Basalt with Caliche Crust

Aphanitic Mafic Igneous Rock with Calcium Carbonate (CaCO3) coating

Rounded gray pebble, likely granite or granitic gneiss

Probable granitic rock, composed mainly of quartz, feldspar, and dark mica or amphibole; exact identification is not possible from the image alone.

Crystal cave / solution cave

Karst cave containing speleothems, chiefly calcite (CaCO₃) and sometimes aragonite; likely a stock image rather than an individual specimen

Dyed Magnesite (or Howlite)

Magnesium carbonate (MgCO3) / Calcium borosilicate hydroxide

Tumbled amethyst

Amethyst, purple variety of quartz (SiO₂)