Mineral (Gemstone)

Polished agate (likely moss or plume agate)

Microcrystalline quartz, SiO₂, chiefly chalcedony with possible included iron oxides

Cherry Quartz with Rose Quartz

Crystalline Quartz (SiO2) with glass-based synthetic components

Sunstone (Feldspar)

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

Lake Superior Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Diamond

Carbon (C)

Likely garnet (rough crystal)

Garnet group; possibly almandine, (Fe₃Al₂(SiO₄)₃)

Quartz-rich rock, possibly milky quartz

Quartz (silicon dioxide, SiO₂), possibly with feldspar or mica inclusions

Quartz Geode

Silicon Dioxide (SiO2)

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Clear faceted gemstone in an ornate metal bracelet

Unidentified transparent faceted stone; possibilities include quartz (SiO₂), zircon (ZrSiO₄), or glass—image alone cannot distinguish them

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Dalmatian jasper beads

Commercially “Dalmatian jasper”; commonly spotted, silica-rich rock sold as jasper, though many specimens are feldspar-rich rock rather than true jasper (microcrystalline quartz).

Mixed tumbled gemstone and mineral lot

Primarily quartz varieties (SiO₂), feldspar, beryl/chalcedony, and other unidentified silicate minerals

Beaded gemstone jewelry (likely amethyst, lapis lazuli, and pearl or glass imitation)

Mixed mineral beads; possible quartz (SiO₂) and lazurite-bearing lapis lazuli

Quartz (Milky/Crystalline fragment)

Silicon Dioxide (SiO2)

Garnet

Almandine (Fe3Al2(SiO4)3)

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O

Moonstone

Orthoclase feldspar ((K,Na)AlSi3O8)

Biotite-bearing granite or granitic gneiss

Quartz–feldspar–biotite aggregate; likely granite, possibly weathered gneiss

Mixed Mineral and Rock Collection

Mixed geological specimens (Quartz, Amethyst, Rose Quartz, Jasper, Epidote, Chert)

Emerald in Matrix

Emerald (Beryllium Aluminum Silicate), Be3Al2(SiO3)6

Turquoise

Hydrate phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Blue Topaz

Al2SiO4(F,OH)2

Moonstone

Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)

Unidentified small rock or mineral fragment

Indeterminate from the blurred image; possibly quartz-rich stone, feldspar, or weathered concrete-like geological material

Chrysocolla on Matrix

Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Yellow Quartz

Silicon Dioxide (SiO2)

Diamond ring

Diamond (crystalline carbon, C)

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Feldspar (specifically Orthoclase)

Potassium Aluminum Silicate (KAlSi3O8)

Polished serpentine (likely bowenite)

Serpentine-group minerals, chiefly antigorite; bowenite is a nickel-rich translucent variety

Yellow Chalcedony / Carnelian

Silicon Dioxide (SiO2)

Quartz (White/Milky Quartz)

Silicon Dioxide (SiO2)

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Citrine and Quartz

Silicon Dioxide (SiO2)

Possible garnet crystal

Likely almandine garnet, Fe₃Al₂(SiO₄)₃; identification is uncertain from this small image

Quartz (Golden Quartz / Citrine / Iron-stained Quartz)

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

Amazonite

Microcline (KAlSi3O8) with lead impurities

Amazonite

Microcline (K(AlSi3O8))