Yellow faceted gemstone, likely citrine or yellow sapphire
Uncertain from image; citrine is quartz (SiO₂), while yellow sapphire is corundum (Al₂O₃)
gemstone
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
Browse igneous or metamorphic (base stone); anthropogenic (decoration) specimens identified by the Rock Identifier community.
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Greenschist
Greenschist (Chlorite Schist)
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Rounded river pebble (likely weathered granite or metamorphic rock)
Indeterminate; possible granitic or quartz-rich lithology
igneous
Schist
Mica Schist (Metamorphic rock)
metamorphic
Biotite (Black Mica)
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Polished serpentine (likely bowenite)
Serpentine-group minerals, chiefly antigorite; bowenite is a nickel-rich translucent variety
metamorphic
Quartzite (Quartz Vein)
SiO2 (Silicon Dioxide)
metamorphic
Citrine
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Amethyst and Rose Quartz Beads
Crystalline Quartz (SiO2) with trace elements
gemstone
Mixed gemstone jewelry collection
Various gemstone minerals, including likely amethyst (quartz), sapphire or iolite, garnet, pearl, turquoise, and colored beryl or tourmaline
gemstone
Bull Quartz (White Quartz)
Silicon Dioxide (SiO2)
mineral
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Chert (specifically Jasper/Carnelian Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Likely basalt or mafic metamorphic rock
Fine-grained basalt, possibly altered; chiefly plagioclase feldspar and pyroxene, with minor iron-titanium oxides
igneous
Polished pink granite pebble
Granite; primarily quartz, potassium feldspar, plagioclase, and minor biotite/hornblende
igneous
Yellow Quartz (Citrine or Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Nutting Stone / Cupstone (Sandstone or Quartzite)
Sedimentary rock with anthropogenic modification (cupule)
sedimentary
Labradorite
(Ca,Na)(Al,Si)4O8 (Plagioclase Feldspar)
mineral
Labradorite
(Ca,Na)(Al,Si)4O8 (Plagioclase Feldspar)
mineral
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Chert (specifically a Lithic Flake)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Granite pebble
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Small rounded pebble, likely basalt
Fine-grained mafic volcanic rock (likely basalt); image alone cannot confirm composition
igneous
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Amethyst crystal
Silicon Dioxide (SiO2) with iron impurities
mineral
Mica (Muscovite or Biotite)
Sheet silicate mineral group (e.g., KAl2(AlSi3O10)(F,OH)2)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Blue Quartz (Dumortierite Quartz / Celestite)
Silicon Dioxide (SiO2) with inclusions
mineral
Quartz Vein Pebble
Silicon dioxide (SiO2)
metamorphic
Petrified Wood
Silicified wood (primarily SiO2)
metamorphic
Epidote
Calcium aluminum iron silicate (Ca2(Al, Fe)3(SiO4)3(OH))
mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Basalt (Porphyritic)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Banded Iron Formation (Metamorphosed Jasper/Siltstone)
Ferruginous Quartzite or Jasperoid Siltstone
metamorphic
Quartzite with Hematite staining
Quartzite (SiO2) with iron oxide inclusions (Fe2O3)
metamorphic
Ceramic or Polished Stone Heart (Anthropogenic Material)
Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)
Synthetic/Anthropogenic Mineraloid
River Pebble (Quartzite/Chert)
Quartzite with inclusions (SiO2)
metamorphic