Chert Pebble
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
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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Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Aquamarine with Sunstone
Aquamarine (Be3Al2Si6O18), Sunstone (Na,Ca)Al(Si,Al)Si2O8
Mineral
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Chalcedony (Botryoidal Agate)
Silicon Dioxide (SiO2)
mineral
Carnelian
Carnelian (SiO2)
mineral
Chert (Quartz Variety)
Microcrystalline Silica (SiO2)
sedimentary
Amber
Succinite (C10H16O)
mineral
Arsenopyrite in Quartz Matrix
Arsenopyrite (FeAsS) with Quartz (SiO2)
Mineral in a Metamorphic/Hydrothermal rock
Citrine Quartz
Citrine (Silicon Dioxide - SiO2)
Mineral
Chert (often called Flint or River Stone)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Unakite
Epidotized Granite
metamorphic
Diamond in Kimberlite
Kimberlite host rock with C (Carbon) inclusion
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Yellow Jasper variant)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Brecciated jasper (likely red-and-cream jasper)
Jasper, an opaque microcrystalline variety of quartz; primarily cryptocrystalline SiO₂ with iron-oxide staining and possible chalcedony/quartz veining
gemstone
Petrified Wood
Silicified Wood (primarily SiO₂ / Silicon Dioxide)
mineral
Red Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (White Chert/Flint)
Chert (SiO2)
sedimentary
Carnelian
SiO2 (Quartz variety)
gemstone
Larimar
Pectolite (NaCa2Si3O8(OH))
mineral
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Carnelian
Chalcedony (SiO2)
gemstone
Glauconite (Green Sandstone)
Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Coral Fossil (Agatized Coral or Petoskey Stone)
Hexagonaria percarinata (if Petoskey) or generally Scleractinia (Agatized Coral)
Sedimentary/Fossil
Chert (Yellow or Tan Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Charoite
Charoite (K(Ca,Na)2Si4O10(OH,F)·nH2O)
metamorphic
Kunzite (Spodumene)
Spodumene (LiAlSi2O6)
mineral
Tumbled Agate (Dyed Blue)
Silicon Dioxide (Chalcedony variety)
gemstone
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Chert (Field Stone)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a secondary sedimentary structure
sedimentary