Rhinestone
Artificial Glass/Crystal
gemstone
Category
Crystal
Browse crystal specimens identified by the Rock Identifier community.
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Green cut gemstone, likely synthetic emerald or glass imitation
Undetermined; natural emerald is beryl (Be₃Al₂Si₆O₁₈), while the vivid, very uniform appearance may indicate imitation material
gemstone
Clear quartz (rock crystal)
Quartz, SiO₂; trigonal crystal system
mineral
Septarian Nodule with Calcite
Septarian Concretion (CaCO3 with internal calcite crystals)
sedimentary
Druzy quartz on matrix
Quartz (SiO₂), microcrystalline crystal coating
mineral
Clear quartz crystal
Quartz (SiO₂), likely a natural crystal point
mineral
Amethyst crystal
Quartz (SiO₂), purple variety colored by trace iron and irradiation
mineral
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) with Quartz crystals
sedimentary
Milky quartz crystal
Quartz (SiO₂), likely a naturally terminated crystal
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18 with Chromium/Vanadium traces)
gemstone
Likely citrine (yellow quartz) crystal
Quartz, SiO₂; identification is tentative from the photo
mineral
Rainbow fluorite crystal point
Fluorite (calcium fluoride, CaF₂)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Milky quartz crystal
Quartz, silicon dioxide (SiO₂), likely a small prismatic crystal or crystal fragment
mineral
Natural Diamond (Faceted)
Diamond (pure carbon crystal, C)
mineral
Quartz geode
Microcrystalline quartz (chalcedony) with drusy quartz crystals; SiO₂
mineral
Amethyst crystal
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
mineral
Tumbled milky quartz
Quartz, SiO₂; trigonal crystal system
mineral
Green fluorite crystal
Fluorite (calcium fluoride, CaF₂)
mineral
Citrine Quartz (Carved Point)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst crystal
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz crystal
Quartz (SiO₂), likely milky or iron-stained quartz
mineral
Likely garnet crystal (rough fragment)
Garnet group; possibly almandine, Fe₃Al₂(SiO₄)₃
mineral
Clear quartz crystal
Quartz, silicon dioxide (SiO₂)
mineral
Green fluorite crystal
Fluorite (calcium fluoride, CaF₂)
mineral
Smoky quartz crystal point
Quartz (SiO₂), likely smoky quartz
mineral
Likely raw emerald or green beryl
Beryl, Be₃Al₂Si₆O₁₈; green color typically from chromium or vanadium
gemstone
Rose quartz (rough specimen)
Quartz, SiO₂; trigonal crystal system
mineral
Rose quartz (rough)
Quartz, SiO₂; trigonal crystal system
mineral
Diamond (Macled/Crystal fragment)
Carbon (C), isometric crystal system
mineral
Clear quartz (rock crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Clear quartz crystal
Quartz (silicon dioxide, SiO₂)
mineral
Rock crystal (clear quartz), possibly cloudy quartz
Quartz, silicon dioxide (SiO₂)
mineral
Quartz vein in foliated metamorphic rock
Likely quartz-bearing schist or gneiss; visible crystal is quartz (SiO₂)
metamorphic
Clear quartz crystal
Quartz (silicon dioxide, SiO₂)
mineral
Cut quartz crystal (likely rock crystal)
Quartz, silicon dioxide (SiO₂), trigonal crystal system
gemstone
Amethyst (rough crystal)
Quartz, SiO₂; purple coloration from trace iron and natural irradiation
mineral
Amethyst (rough crystal)
Quartz, SiO₂; purple color commonly caused by iron impurities and natural irradiation
mineral
Amethyst crystal fragment
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron and irradiation
gemstone
White drusy quartz
Quartz, silicon dioxide (SiO₂), with a drusy coating of tiny crystals
mineral
Black tourmaline (schorl) crystal fragment
Schorl, a sodium–iron tourmaline; approximate formula NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
mineral