Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Category
Organic Gemstone (Not A Mineral)
Browse organic gemstone (not a mineral) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Not A Mineral) in the encyclopedia
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Chert (Septarian or Nodular variety)
Microcrystalline Quartz (SiO2)
sedimentary
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Organic Gemstone (Sedimentary classification)
Amber
Amber (Amorphous Organic Hydrocarbon)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))
mineral
Limonite (Iron Ore)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Shale
Fissile Mudstone (Shale)
sedimentary
Amazonite
K(AlSi3O8) - Microcline
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Jasper
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Glauconitic Sandstone (Greensand)
Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Petrified Wood
Silicon Dioxide (SiO2) - Calcified / Silicified Wood
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Black Jasper (Etched)
Silicon Dioxide (SiO2) with impurities
mineral
Chalcedony (Agatized Coral / Rough Chalcedony Node)
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
Sedimentary/Mineral
Chert (specifically Flint or Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
Mineral
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Blue Topaz
Aluminum Silicate Fluoride Hydroxide Al2SiO4(F,OH)2
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Almandine Garnet in Matrix
Almandine (Fe3Al2(SiO4)3)
metamorphic
Moss Agate
Chalcedony (Silicon Dioxide with inclusions) - SiO2
mineral
Jasper or Agate (Chalcedony)
Silicon Dioxide (SiO2) with impurities
sedimentary
Mixed Gemstone and Mineral Collection
Mixed Silica and Carbonate minerals (SiO2, CaSO4·2H2O, etc.)
mineral
Petrified Wood
Silicified Wood (primarily SiO₂)
sedimentary
Chrysocolla
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Hydrated Copper Phyllosilicate)
mineral
Septarian Nodule
Septarian Concretion
sedimentary
Green Moss Agate
Agate (Silicon Dioxide - SiO2 with inclusions of Manganese/Iron oxides)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Agatized Fossil (Druzy Agate)
Silicon Dioxide (SiO2) replacing organic matter
sedimentary
Sandstone
Arenite (primarily composed of SiO2)
sedimentary
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Petrified Wood
Silicified Wood (SiO2)
sedimentary
White Topaz
Al2SiO4(F,OH)2
mineral
Zebra Marble
Metamorphosed Alabaster/Limestone (CaCO3)
metamorphic
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcedony replacement)
Mineral / Fossil
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Garnet in Matrix (Schist or Quartz)
Almandine Garnet, Fe3Al2(SiO4)3
metamorphic