Emerald
Beryl (Be₃Al₂(SiO₃)‑₆) with Chromium/Vanadium impurities
mineral
Category
Mineraloid (Man Made Origin)
Browse mineraloid (man made origin) specimens identified by the Rock Identifier community.
Learn about Mineraloid (Man Made Origin) in the encyclopedia
View all →
Green beryl (likely emerald)
Beryl, Be₃Al₂Si₆O₁₈; green gem-quality beryl is called emerald when its color is caused mainly by chromium and/or vanadium.
gemstone
Tourmaline-bearing pegmatite, likely schorl
Black tourmaline (schorl), NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄, in quartz-rich pegmatite
igneous
Cut colorless gemstone, likely diamond
Diamond (crystalline carbon, C)
gemstone
Coral Skeleton (Scleractinia)
Aragonite (CaCO3) biomineralisation within Anthozoa
fossil
Amber
Fossilized Tree Resin
gemstone
Obsidian (volcanic glass), likely black obsidian
Rhyolitic volcanic glass; predominantly amorphous SiO₂
igneous
Tumbled black stone, likely black obsidian
Obsidian — natural volcanic glass, primarily SiO₂
igneous
Ruby
Corundum (Al2O3 with Chromium trace)
gemstone
Ruby (in a ring setting)
Corundum (Al2O3:Cr)
gemstone
Chalk
Micrite (primarily Calcium Carbonate, CaCO3)
sedimentary
Fluorite
Calcium fluoride (CaF2)
mineral
Fluorite on Matrix
Calcium Fluoride (CaF2)
mineral
Fluorite Cleavage Octahedron
Fluorite (Calcium Fluoride, CaF2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite on Matrix
Calcium Fluoride (CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Pearl (Biogenic Mineral)
Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3
mineral
Diamond (in Jewelry Setting)
Carbon (C)
gemstone
Dark gray-green pebble, likely basalt
Fine-grained basalt (tentative; image alone cannot confirm composition)
igneous
Polished mahogany obsidian
Volcanic glass; primarily silica-rich rhyolitic composition (approximately 70–75% SiO₂)
igneous
Bumblebee Jasper
Calcite with Arsenic and Sulfur inclusions
sedimentary
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian (Gold Sheen)
Obsidian (SiO2 + impurities)
igneous
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Snowflake Obsidian
Volcanic Glass (SiO2) with Cristobalite inclusions
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Mixed rock and mineral collection
Unidentified assortment of geological specimens; individual species cannot be determined from the image
mineral
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Blue Slag Glass
Amorphous Silica (Byproduct of smelting)
Antropogenic (Man-made)
Cardstock (Paper)
Cellulose (C6H10O5)n
sedimentary (man-made)
Blue Goldstone
Aventurine Glass (SiO2 with Cobalt/Copper inclusions)
man-made glass
Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Anthropogenic (Man-made)
Slag (Anthropogenic Glass/Iron byproduct)
Ferro-silicate Slag
Anthropogenic (Man-made)
Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)
Silicon Dioxide (SiO2) with metallic inclusions
man-made material
Turquoise and coral bead necklace
Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O; coral: chiefly CaCO₃ (aragonite or calcite)
gemstone