Black tourmaline
Schorl, NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Category
Mineral Side Rock
Browse mineral side rock specimens identified by the Rock Identifier community.
Learn about Mineral Side Rock in the encyclopedia
View all →
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Amethyst Cluster
Silicon Dioxide (Quartz variety: Amethyst), SiO2
mineral
Green tourmaline crystal (probable)
Elbaite tourmaline, complex borosilicate; approximate formula Na(Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
gemstone
Nephrite Jade
Nephrite
Mineral/Rock
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst (Variety of Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst cluster
Quartz, SiO₂, violet variety (amethyst)
mineral
Quartz Crystal (specifically a milky or semi-translucent single crystal point)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon dioxide (SiO2) containing traces of iron and manganese
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe4+ impurities)
mineral
Quartz-bearing dark mineral specimen, likely schorl tourmaline in quartz
Quartz (SiO₂) with probable schorl tourmaline (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Amethyst crystal (likely quartz)
Quartz, crystalline silica (SiO₂), purple variety amethyst
gemstone
Garnet (Rough Almandine Crystal)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Alexandrite (or Quartz with Chrysoberyl/Phenakite crystal form / Feldspar inclusions)
Chrysoberyl (BeAl2O4) or Quartz (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with Iron impurities)
mineral
Red Garnet
Pyrope-Almandine series (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)
mineral
Amethyst cluster
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
mineral
Red Garnet
Pyrope-Almandine series (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with ferric impurities)
mineral
Small blue-green mineral fragment, possibly apatite or beryl
Tentatively fluorapatite, Ca₅(PO₄)₃(F,Cl,OH), or beryl, Be₃Al₂Si₆O₁₈
mineral
Citrine Quartz
Crystalline Silicon Dioxide (SiO2) with Ferric Iron impurities
mineral
Amethyst
Amethyst (Varietal of Quartz), SiO2 (Silicon Dioxide)
mineral
Amethyst
Quartz (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Garnet (Almandine/Pyrope variety)
Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)
mineral
Almandine Garnet
Almandite (Fe3Al2(SiO4)3)
Mineral
Amethyst
SiO2 (Amethyst is a variety of Quartz)
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Clear quartz crystal pendant
Quartz (silicon dioxide, SiO₂)
mineral
Smoky Quartz (Chlorite Inclusions)
Silicon Dioxide (SiO2) with trace Aluminum and Natural Irradiation
mineral
Iron-stained quartz crystal
Quartz (SiO₂), likely limonite/goethite inclusions or surface coating
mineral
Fluorite
Fluorite (CaF₂)
mineral
Petoskey Stone (Fossilized Rugose Coral)
Hexagonaria percarinata (Calcium Carbonate, CaCO3)
sedimentary
Likely quartz cluster with iron staining
Quartz (SiO₂), possibly with calcite or feldspar inclusions
mineral
Honey quartz crystal cluster
Quartz, silicon dioxide (SiO₂), likely iron-stained or inclusion-rich quartz
mineral
Small purple quartz crystal, likely amethyst
Amethyst: violet variety of quartz, silicon dioxide (SiO₂)
gemstone
Unknown Rock Fragment
Unknown
unknown
Crushed stone aggregate
Mixed lithic aggregate; individual fragments cannot be identified from the image
sedimentary