Black Pearl (Tahitian Pearl)
Aragonite / Calcite (CaCO3) with Conchiolin
mineral
Category
Organic Gemstone (Often Associated With Sedimentary Sequences)
Browse organic gemstone (often associated with sedimentary sequences) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Often Associated With Sedimentary Sequences) in the encyclopedia
View all →
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
mineral
Chert (specifically Red Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Dendritic Opal
Hydrated amorphous silica with manganese or iron oxide dendrites (SiO2·nH2O)
gemstone
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Alabaster
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
sedimentary
Conglomerate
Polymictic Conglomerate
sedimentary
Chert (and its variety Flint)
Silicon dioxide (SiO2) / Microcrystalline quartz
sedimentary
Glauconitic Sandstone (or Greensand)
Glauconitic Siliciclastic Rock (Containing (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Amber
Succinicum (Formula: C10H16O)
Mineraloid
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Red Jasper
Jasper (Silicon Dioxide) - SiO2
sedimentary/mineral
Chert (Black Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (Fossilized Tree Resin, C10H16O)
gemstone
Amazonite
Microcline (KAlSi3O8) with lead impurities
mineral
Flint
Chert (a form of cryptocrystalline quartz, chemical formula SiO₂)
Mineral
Jasper (specifically Fancy or Polychrome Jasper)
Silicon Dioxide (SiO2) - Chalcedony
Sedimentary
Tumbled carnelian (orange chalcedony)
Carnelian, a microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides
gemstone
Pink Opal
Hydrated Silica (SiO2·nH2O) with Palygorskite/Sepiolite inclusions
gemstone
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Chert (Quartz Variety)
Microcrystalline Silica (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Chert (Blue-Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Chert (var. Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
SiO2
Mineral
Amazonite
Microcline Feldspar (KAlSi3O8)
mineral
Jasper
Silicon dioxide (SiO2) with iron inclusions
sedimentary
Jasper
Jasper (Silicon Dioxide) - SiO2
sedimentary
Chert (specifically Red Chert / Jasper)
Silicon Dioxide (SiO2)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Yellow Topaz
Aluminum silicate fluorohydroxide, Al2SiO4(F,OH)2
gemstone
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Dearest Jewelry (Multigemstone)
Combination of Diamond (C), Emerald (Be3Al2Si6O18), Amethyst/Rock Crystal (SiO2), Ruby (Al2O3), Emerald (Be3Al2Si6O18), Sapphire (Al2O3), and Topaz (Al2SiO4(F,OH)2)
Mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)
sedimentary
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary