Sphalerite in Matrix (Polished Point)
Zinc sulfide (Zn,Fe)S
mineral
Category
Mineral, Jewelry
Browse mineral, jewelry specimens identified by the Rock Identifier community.
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Quartz (Druzy / Crystalline)
Silicon Dioxide (SiO2)
mineral
Tumbled opalite (likely man-made glass)
Opalite, a trade name for opalescent glass; not natural opal
mineral
Mother of Pearl and Onyx
Aragonite (Mother of Pearl) and Chalcedony (Onyx)
mineral
Blue Zircon
Zircon (Zirconium Silicate - ZrSiO4)
gemstone
Botryoidal chalcedony (likely common opal)
Silica, SiO₂; chalcedony is microcrystalline quartz, while opal is hydrated amorphous silica (SiO₂·nH₂O)
mineral
Amazonite
K(AlSi3O8), Microcline
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Translucent amber-colored gemstone, likely citrine or amber
Most plausibly quartz (SiO₂), specifically citrine; amber would be fossilized resin (organic polymer)
gemstone
Diamond (in a jewelry setting)
Carbon (C)
mineral
Hematite Nodule
Hematite (Alpha Fe2O3)
mineral
Rose quartz cabochon
Quartz, SiO₂ (rose quartz; trigonal crystal system)
gemstone
Amethyst (rough purple quartz)
Quartz, SiO₂; purple color from trace iron and natural irradiation
mineral
Amethyst cluster
Amethyst, purple quartz (SiO₂)
mineral
Amethyst (likely tumbled or polished)
Quartz, SiO₂; purple color commonly caused by trace iron and natural irradiation
gemstone
Amethyst-bearing geode fragment
Quartz (SiO₂), with purple amethyst crystals; exact identification is uncertain from the image
mineral
Weathered concrete or cementitious slab (not natural rock)
Artificial calcium-silicate cement composite; likely Portland cement concrete
sedimentary
Raw Topaz (or Smoky Quartz)
Al2SiO4(F,OH)2 / Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Septarian Nodule (Dragon Stone)
Septarian Concretion (CaCO3 + MgCO3 + Clay)
sedimentary
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
gemstone
Imperial Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Quartz (Herkimer Diamond variant)
Silicon Dioxide (SiO2)
mineral
Tektite (Indochinite)
Tektite (Terrestrial Impact Glass)
meteorite
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst (Faceted)
Silicon Dioxide with iron impurities (SiO2)
gemstone
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
SiO2 (Silicon Dioxide)
gemstone
Prehnite with Epidote
Prehnite (Ca2Al(AlSi3O10)(OH)2) with Epidote inclusions (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Tiger's Eye
Silicon dioxide (SiO2) with inclusions of Limonite
metamorphic
Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace Manganese, Titanium, or Iron
mineral
Amazonite
Microcline (KAlSi3O8)
mineral
Azurite and Malachite
Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2CO3(OH)2)
mineral
Amethyst on Basalt
Silicon dioxide (SiO2) with trace Iron
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Green Moss Agate
Agate (Silicon Dioxide, SiO2) with inclusions
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Azurite and Malachite
Copper Carbonates: Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)
mineral