Chert (specifically Yellow Jasper variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Category
Organic (Biological Specimen)
Browse organic (biological specimen) specimens identified by the Rock Identifier community.
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Green variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Green Jasper with Agate Banding
Silicon Dioxide (SiO2) with impurities of ferrous silicate or chlorite
sedimentary (chemical/biological origin)
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Chert (Grey-Green Var.)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
mineral (silicate-replaced organic material)
Chert (Iron-stained River Cobble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Chert (Chert Nodule with Cortex)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Iron-stained)
Chert (primarily Microcrystalline Quartz, SiO2)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Jasper with Quartz Vein
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Glauconitic Sandstone (Greensand pebble)
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Shale with Plant Fossils / Carbonaceous Shale
Laminated Mudrock (Siliciclastic)
sedimentary
Chert (Green variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Carved Mottled Greenish-Yellow Crystal/Glass Object
Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.
Man-made Object/Uncertain Mineral
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood / Chalcedony (SiO2)
sedimentary
Blue Agate (Tumbled and Dyed)
Silicon Dioxide (SiO2) with likely organic dyes
mineral
Fossilized Wood (with Coal and Limonite)
Petrified Wood (Silicified or Carbonized Flora)
sedimentary
Chert (also known as Flint or Common Chalcedony)
Cryptocrystalline Silica (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Banded Agate (specifically Moss Agate or Plume Agate variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Graphite-veined Quartzite
Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)
metamorphic
Moss Agate
Chalcedony (Silicon Dioxide with inclusions) - SiO2
mineral
Arid Sandy Loam
Arenosols / Regosols
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Arrowhead or Projectile Point)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
metamorphic
Septarian Nodule (Septarian Dragon Stone)
Septarian Concretion (Composition: Calcite, Aragonite, and Limestone/Clay)
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2 + impurities)
mineral
Amber and Citrine Quartz
Succinite (Amber) and Silicon Dioxide (SiO2 / Citrine)
mineral
Black Pearl (Tahitian Pearl)
Aragonite / Calcite (CaCO3) with Conchiolin
mineral
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)
metamorphic
Amber
Succinite (C10H16O)
mineraloid
Amber
Succinite (fossilized resin, C10H16O)
mineral
Pearl (Imitation or Cultured)
Calcium Carbonate (Aragonite/Calcite) - CaCO3
Mineraloid (Organic)
Shale with Vein Infillings
Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.
Sedimentary Rock
Amber
Succinite (C10H16O)
mineral
Jasper (Wonderstone/Banded Jasper)
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary (chemical/biological origin) or volcanic-related metamorphic
Amber
Succinite (formula varies, primarily C10H16O)
Mineraloid (Organic)