Ironstone concretion / Limonitic Sandstone
Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)
sedimentary
Category
Organic Gemstone (Often Associated With Sedimentary Sequences)
Browse organic gemstone (often associated with sedimentary sequences) specimens identified by the Rock Identifier community.
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline silica (SiO2) with trace Iron oxide (Fe2O3)
sedimentary
Chrysocolla in Matrix
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variations include Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Drill Core Sample
Cylindrical Rock Core (Specific mineralogy varies by extraction site)
Metamorphic (Likely Gneiss or Schist based on texture)
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Peach Moonstone
Orthoclase (Potassium Aluminum Silicate), KAlSi3O8
mineral
Yellow Jade (often Serpentine or Dolomite)
Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.
Mineral, often a rock given its aggregate nature
Peach Moonstone (Orange/Peach Feldspar)
Potassium aluminum silicate (KAlSi3O8)
mineral
Chert / Flint
Silicon Dioxide (SiO₂)
sedimentary
Amber
Succinite (fossilized resin)
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
metamorphic
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Black Sapphire (Basaltic Blue Sapphire)
Corundum (Al2O3)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Unakite
Epidotized Granite
metamorphic
Jasper
Silicon Dioxide (SiO2) with iron and magnesium inclusions
sedimentary
Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
![Chrysocolla (with Quartz and Azurite) (Hydrated copper phyllosilicate mineral [Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)]) — mineral](https://media.rockidentification.com/201b7890-f15a-45aa-9603-fb073bb0435d-thumbnail.jpg)
Chrysocolla (with Quartz and Azurite)
Hydrated copper phyllosilicate mineral [Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)]
mineral
Chert (Brown variety / Common Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Graphite
Graphite (Carbon, C)
Mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Carnelian
Carnelian (a variety of Chalcedony, SiO ₂)
Mineral (specifically a variety of Chalcedony, which is a cryptocrystalline quartz)
Beryl (likely Aquamarine or Green Beryl)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Aragonite (variety 'Flos Ferri')
Aragonite (CaCO3)
Mineral
Amber
Succinite (C10H16O)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Bloodstone (Heliotrope)
Cryptocrystalline Quartz (SiO2) with inclusions of Hematite or Chlorite
mineral
Kyanite in Quartz
Kyanite (Al2SiO5) with Quartz (SiO2)
metamorphic
Amazonite (or Amazon Stone)
Potassium Feldspar (Microcline), K(AlSi3O8)
mineral
Beryl (var. Heliodor or Aquamarine)
Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Amber (Rough Baltics/Beach Specimen)
Succinicum (Organic Gemstone - Fossilized Resin)
mineral
Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic