Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Category
Organic Gemstone (Often Associated With Sedimentary Sequences)
Browse organic gemstone (often associated with sedimentary sequences) specimens identified by the Rock Identifier community.
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Chert (variant Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Chrysocolla
Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Yellow Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Sapphirine in Magnesian Schist
Sapphirine: (Mg,Al)8(Al,Si)6O20
metamorphic
Chert (Flint)
SiO2 (Microcrystalline Quartz)
sedimentary
Chert (Jasper/Chaldcedony)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chalcedony/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fluorite in Matrix
Fluorite (CaF2) within a host rock matrix
Mineral
Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Rough Ruby (Corundum) in Zoisite Matrix
Al2O3 (Aluminum Oxide) with Ca2Al3(SiO4)3(OH)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Amber
Succinite (amorphous organic polymer)
mineral
Fuchsite Gneiss or Schist
Muscovite (variety Fuchsite) within Metamorphic Host Rock
metamorphic
Carnelian
Carnelian (Silicon Dioxide - SiO2 with iron oxide impurities)
mineral
Chert (and Fossilized Brachiopod shell)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Chert Concretion (Flint)
Silicon Dioxide (SiO2)
sedimentary
Green Quartz (Prasiolite/Adventurine/Jasper)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Jasper
Chalcedony (SiO2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Gneiss
Foliated Metamorphic Gneiss
metamorphic
Red Jasper
Jasper (SiO2) with Hematite (Fe2O3) inclusions
sedimentary (microcrystalline quartz)
Agate (specifically a small Chalcedony nodule)
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Red Jasper
Quartz (Silicon Dioxide) with Hematite inclusions, SiO2 + Fe2O3
mineral
Psilomelane (Black Hematite varietal)
Barium Manganese Oxide (Ba,H2O)2Mn5O10
mineral
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Fossiliferous Flint
Microcrystalline Quartz (SiO2) with Echinoid Fossil
sedimentary
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Blue-green turquoise-like tumbled stone
Turquoise, hydrous copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Sodalite
Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary