Obsidian
Volcanic glass (mainly SiO2 with inclusions)
igneous
Category
Organic Gem Material (Botanical)
Browse organic gem material (botanical) specimens identified by the Rock Identifier community.
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Prehnite
Prehnite, Ca2Al(AlSi3O10)(OH)2
mineral
Ruby
Corundum (Al2O3)
mineral
Precious Opal
Hydrated silica (SiO2·nH2O)
mineraloid
Amethyst (Rough)
Silicon Dioxide with iron impurities (SiO2)
mineral
Kyanite
Kyanite (Al2SiO5)
mineral
Rose Quartz
Quartz (Silicon Dioxide) - SiO2
mineral
Sunstone
Oligoclase (Plagioclase Feldspar) - (Na,Ca)(Si,Al)4O8 with Hematite or Copper inclusions
mineral
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Goldstone
Aventurine Glass (Man-made)
mineral
Ferruginous Sandstone (Ironstone Conglomerate fragments)
Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)
sedimentary
Zebra Jasper
Tetragonal Silicon Dioxide (Quartz) with impurities
sedimentary
Mother of Pearl (Nacre)
Nacre (Aragonite/Conchiolin), CaCO3 + Organic Polymers
mineral
Apatite
Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))
mineral
Emerald
Beryl (Be3Al2Si6O18), specifically the green variety colored by chromium or vanadium
Mineral (Gemstone variety of Beryl)
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Amber
Succinite (Fossilized Tree Resin), C10H16O
Organic Mineraloid
Amber (Rough Baltics/Beach Specimen)
Succinicum (Organic Gemstone - Fossilized Resin)
mineral
Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (varieties: Flint, Jasper)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Chert (often called Flint)
Chert (SiO2)
sedimentary
Chert with Quartz Vein
Silicon dioxide (SiO2)
sedimentary
Fairy Stone (Menilite Concretion)
Carbonate-rich concretion (often Siderite or Calcite in Clay)
sedimentary
Glauconitic Sandstone
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper variant)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Field Stone)
Chert (Silicon Dioxide, SiO2)
sedimentary
Dragon Blood Jasper
Epidote with Red Piedmontite (Chalcedony/Quartz variant)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Shungite
Non-crystalline carbon (Fullerene-bearing)
mineral
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (with Limestone/Marble traces)
Silicon Dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Chert / Flint
Silicon dioxide (SiO2)
sedimentary
Fossiliferous Limestone
Biomicrite / Limestone with fossils
sedimentary