Schist
Lepidoblastic Mica Schist
metamorphic
Category
Mineral (Specifically A Gemstone Variety)
Browse mineral (specifically a gemstone variety) specimens identified by the Rock Identifier community.
Peridot
Olivine (specific variety: gem-quality forsterite), (Mg,Fe)2SiO4
Mineral
Chert (with Lichen)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Quartz (SiO2)
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate) - a variety of Microcline Feldspar
mineral
Chert (Jasper variety)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Chert (specifically Green Chert/Jasper)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende, chlorite, or manganese/iron oxides
mineral
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite (SiO2 + Fe2O3)
igneous
Chert (Black Chert/Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Quartz (pebble)
Quartz (SiO₂)
Mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Pink Granite / Gneiss
Felsic Plutonic Rock (Granite) with Gneissic banding
igneous / metamorphic
Chert (specifically Gray Chert)
Chert (SiO2)
sedimentary
Feldspar-rich Granite (Pink Granite)
Phaneritic Felsic Igneous Rock
igneous
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Chert (often called Flint)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Fossil Coral
Coral Limestone (a type of biogenic sedimentary rock)
Sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Massive Quartz (Yellow/Citrine variety)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Granite (Alkali-feldspar Granite)
Felsic Plutonic Rock (Primary minerals: Quartz SiO2, Orthoclase KAlSi3O8, Plagioclase (Na,Ca)AlSi3O8)
igneous
Rose Quartz
SiO2 (Silicon Dioxide with trace inclusions)
mineral
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with impurities of Iron Oxide
sedimentary
Jade (Nephrite or Jadeite)
Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2 (amphibole mineral); Jadeite: NaAlSi2O6 (pyroxene mineral)
Metamorphic Rock / Mineral
Jasper
Jasper / Silicon Dioxide (SiO₂)
sedimentary
Aventurine (specifically Green Aventurine)
Silicon Dioxide (Quartz) with inclusions of Fuchsite; SiO2 + K(Al,Cr)2AlSi3O10(OH)2
metamorphic
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (mica)
Mineral (variety of Quartz)
Black Onyx
Silicon Dioxide (SiO2) with cryptocrystalline structure
mineral
Chert (specifically Red Chert / Jasper nodule)
Silicon dioxide (SiO2)
sedimentary
Amethyst
SiO2 (Silicon Dioxide) - Purple variety of Quartz
mineral
Garnet (Red Garnet)
Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).
Mineral (specifically, a variety of the mineral species Pyrope-Almandine Garnet)
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
Mineral (Variety of Chalcedony)