Quartz
Silicon Dioxide (SiO2)
Category
Browse mineral (gemstone variety of beryl) specimens identified by the Rock Identifier community.
Quartz
Silicon Dioxide (SiO2)
Mixed gemstone jewelry collection
Various gemstone minerals, including likely amethyst (quartz), sapphire or iolite, garnet, pearl, turquoise, and colored beryl or tourmaline
Quartz-rich pegmatite (likely feldspar–quartz rock)
Granitic pegmatite; chiefly quartz (SiO₂) and feldspar, with possible mica/iron-oxide staining
Granitic Pegmatite
Granitic Pegmatite (principally Quartz, Feldspar, and Mica)
Jasper
Microcrystalline Quartz (SiO2)
Pegmatite, probably mica-rich
Granitic pegmatite composed mainly of quartz, feldspar, and mica (likely biotite and/or muscovite)
Quartz (Orange/Pink variety)
Silicon Dioxide (SiO2)
Pegmatite (White Granite variant)
Pegmatitic Granite (Quartz and Feldspar rich)
Pegmatite with muscovite mica
Granitic pegmatite; chiefly quartz (SiO₂), feldspar, and muscovite mica [KAl₂(AlSi₃O₁₀)(OH)₂]
Spessartine Garnet
Mn3Al2(SiO4)3
Green tourmaline (likely elbaite)
Tourmaline-group cyclosilicate; likely elbaite, Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Quartz
Silicon Dioxide (SiO2)
Quartz-rich pegmatite, possibly with feldspar and mica
Granitic pegmatite; mainly quartz (SiO₂), feldspar, and mica
Possibly a polished pale-green gemstone cabochon (likely aquamarine or fluorite)
Undetermined from the image; aquamarine is blue-green beryl (Be₃Al₂Si₆O₁₈), while fluorite is CaF₂
Mica-rich pegmatite (likely muscovite-bearing granite)
Pegmatite; chiefly quartz (SiO₂), feldspar, and muscovite mica
Aquamarine and clear quartz
Aquamarine (Be3Al2Si6O18), Quartz (SiO2)
Emerald
Beryl, Be₃Al₂(SiO₃)₆, colored green mainly by chromium and/or vanadium
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
Milky Quartz
Silicon Dioxide (SiO2)
Orange carnelian (likely)
Chalcedony, microcrystalline quartz (SiO₂), colored by iron oxides
Red Tiger's Eye beads
Tiger's Eye (variety of Chalcedony, SiO2)
Amazonite
Microcline (KAlSi3O8)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2
Amethyst (polished/tumbled pieces)
Quartz, SiO₂; purple color from trace iron and natural irradiation
Polished red garnet (likely almandine)
Almandine garnet, Fe₃Al₂(SiO₄)₃; identification from the photo is provisional
Agate (Carnelian / Chalcedony)
Silicon Dioxide (SiO2)
Green cabochon gemstone, likely glass-filled or synthetic emerald imitation
Uncertain; possible synthetic emerald (beryl, Be₃Al₂Si₆O₁₈) or green glass
Quartz
Silicon Dioxide (SiO2)
Jasper
Chalcedony (SiO2)
Jasper (Green Jasper/Heliotrope variety)
Silicon Dioxide (SiO2)
Imperial Topaz
Aluminum Silicate Fluoride Hydroxide Al2SiO4(F,OH)2
Imperial Topaz
Al2SiO4(F,OH)2
Quartz-rich pegmatite (likely feldspar–quartz rock)
Granitic pegmatite; predominantly quartz (SiO₂) and feldspar, with possible mica and iron-oxide staining
Ruby (Raw Corundum)
Al2O3 (Aluminum Oxide)
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
Citrine
Silicon Dioxide (Quartz variety)
Sunstone
Oligoclase (Feldspar variety)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)