Mineral (Man Modified)

Titanium Coated Aura Quartz (Apple Aura Quartz)

Silicon Dioxide (SiO2) with Metallic Vapor Deposition Coating

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Crackle Agate / Dyed Quartz

SiO2 (Silicon Dioxide)

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Pet Rock (Quartzite/Sandstone River Rock)

Silicon Dioxide (SiO2) mixture

Blue Crackle Quartz (Dyed Quarzite)

Silicon Dioxide (SiO2) with artificial dye

Citrine quartz crystal

Quartz, silicon dioxide (SiO₂); yellow variety commonly called citrine

Banded calcite crystal tower

Calcite (CaCO₃), likely honey or brown banded calcite

Biotite-bearing granite or granitic gneiss

Granite/granitic gneiss, chiefly quartz, feldspar, and biotite mica, with possible epidote or chlorite alteration

Green fluorite crystal

Fluorite (calcium fluoride, CaF₂)

Granite / Gneiss (Coarse-Grained Felsic Rock)

Granite (Quartz-Feldspar-Mica aggregate)

Painted River Pebble (likely Basalt or Greywacke)

Aphanitic Lithic Clast with Anthropogenic Pigment coating

Quartz Heart or Arrowhead Shape

Silicon Dioxide (SiO2)

Smoky quartz crystal

Quartz, SiO₂; likely smoky quartz, possibly coated or included

Purple fluorite cluster

Fluorite (calcium fluoride, CaF₂)

N/A - Non-Geological Item

Amethyst crystal (likely quartz)

Quartz, crystalline silica (SiO₂), purple variety amethyst

Amethyst stalactite slice pendant

Amethyst (紫 quartz), SiO₂, with concentric quartz/chalcedony and likely agate banding

Amethyst-bearing quartz

Quartz, SiO₂, with purple amethyst zoning and likely white milky quartz

Aquamarine cabochon ring

Aquamarine, blue variety of beryl (Be₃Al₂Si₆O₁₈)

Likely polished garnet fragment

Garnet group, possibly almandine (Fe₃Al₂Si₃O₁₂)

Polished Morganite (pink beryl), possibly rose quartz

Beryl, Be₃Al₂Si₆O₁₈, colored by manganese; visual identification is uncertain because the image is blurred

Honey calcite crystal

Calcite (calcium carbonate, CaCO₃)

River Cobble (likely Basalt or Metagraywacke)

Non-specific water-worn lithic fragment

Bixbyite on Rhyolite

Bixbyite (Mn2+,Fe3+)2O3

Tumbled amethyst

Quartz, SiO₂; purple variety colored mainly by iron-related defects and irradiation

Painted Sandstone Cobble

Clastic Sedimentary Rock (Sandstone base)

Diamond (Princess Cut Faceted Gemstone)

Native Carbon (C)

Polished brecciated jasper

Microcrystalline quartz (SiO₂), commonly with hematite/goethite and iron-rich alteration minerals

Painted Sandstone

Sandstone (clastic sedimentary rock) with acrylic/artistic coating

Opalite

Synthetic glass / Opalized glass

Fossilized Ray Barb (Stinger) Fragment

Myliobatiformes indet. (Fossil stingray spine)

One Pound Coin (UK)

Nickel-Brass Alloy (Cu-Zn-Ni)

Weathered rhyolite or felsic volcanic rock

Rhyolite, commonly quartz–alkali feldspar–plagioclase with iron-oxide alteration

River Pebble Gravel

Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)

Not a geological specimen

N/A (man-made object)

Native Silver

Silver (elemental Ag)

Opalite

Man-made opalized glass

Mystic Topaz (Treated Quartz or Topaz)

Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Asphalt Concrete

Bituminous conglomerate

Blue-green faceted gemstone, possibly glass or synthetic material

Not identifiable from the image; possible synthetic spinel or glass