Lepidolite with Quartz
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Category
Mineral Group
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Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Biotite on Quartz
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) and Quartz (SiO2)
mineral
Mixed Mineral and Fossil Collection
Multi-specimen assemblage (SiO2, CaCO3, FeS2, etc.)
mineral
Labradorite (Raw)
(Ca,Na)(Al,Si)4O8
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Polished jasper carving or slab
Jasper, an opaque microcrystalline variety of quartz (SiO₂), likely iron-oxide-rich brecciated or orbicular jasper
gemstone
Biotite Mica
Biotite (K(Mg,Fe)3(AlSi3O10)(F,OH)2)
mineral
Tumbled green-and-white stone, likely serpentine
Serpentinite; mainly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnesite or talc
metamorphic
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Quartz with Tourmaline inclusions
Silicon Dioxide (SiO2) with Tourmaline needles
mineral
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
metamorphic
Red faceted gemstone, possibly garnet
Likely almandine garnet, Fe₃Al₂(SiO₄)₃; identity cannot be confirmed from the image
gemstone
Almandine Garnet
Fe3Al2(SiO4)3
gemstone
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Garnet in Host Rock
Garnet Group (A3B2(SiO4)3)
metamorphic
Schorl (Black Tourmaline)
NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)
mineral
![Garnet-bearing Schist (Almandine Garnet [Fe3Al2(SiO4)3] in Micaceous Schist) — metamorphic](https://media.rock.id/9cd2761d-feab-4ba6-afa1-0e8fb7dce6d4-thumbnail.jpg)
Garnet-bearing Schist
Almandine Garnet [Fe3Al2(SiO4)3] in Micaceous Schist
metamorphic
Faceted red gemstone, likely garnet
Most likely almandine garnet (Fe₃Al₂(SiO₄)₃); identification from the photo is tentative.
gemstone
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Kyanite in Quartz
Kyanite (Al2SiO5) with Quartz (SiO2)
metamorphic
Vanadinite
Pb5(VO4)3Cl
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
gemstone
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Garnet (Almandine-Pyrope)
Almandine-Pyrope Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3
mineral
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
mineral
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
metamorphic
Sugilite
Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)
mineral
Polished green-and-white stone, possibly serpentine or jade
Tentatively serpentine (Mg₃Si₂O₅(OH)₄) or nephrite jade (interlocking amphibole fibers)
mineral
Amethyst quartz cluster
Quartz, SiO₂; purple variety colored mainly by iron impurities and irradiation
mineral
Mica (Muscovite)
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Spinosaurus fossil (permineralized bone)
Spinosaurus aegyptiacus (Calcium phosphate mineralized with silica/sediment)
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Echinoidea (Fossil Sea Urchin)
Echinodermata Echinoidea
sedimentary
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Almandine Garnet in Schist Matrix
Almandine - Fe3Al2(SiO4)3
metamorphic
Serpentinite (likely)
Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and minor chlorite/talc
metamorphic
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Fossil bivalve or brachiopod in sedimentary rock
Unidentified fossil shell impression; likely a ribbed bivalve or brachiopod preserved in shale/siltstone
fossil