Petrified Wood
Silicified Wood (SiO2)
sedimentary
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
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Jasper (specifically Brecciated or Agated Jasper)
Silicon Dioxide (SiO2) - Chalcedony with impurities
Mineral / Sedimentary
Chert Arrowhead
Cryptocrystalline microcrystalline Quartz (SiO2)
sedimentary
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Hematite/Limonite)
mineral
Druzy Quartz on Agate/Chert
Silicon Dioxide (SiO2)
mineral
Clear Quartz (or Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Ferruginous Sandstone
Clastic Sedimentary Rock (Iron-rich)
sedimentary
Synthetic Ruby (Jewel Bearings)
Synthetic Corundum (Al2O3 doped with Chromium)
mineral
Quartz (with probable host rock)
Silicon Dioxide (SiO2)
mineral
Blue-dyed Quartz Druzy
Silicon Dioxide (SiO2) with artificial pigment
mineral
Limestone (specifically Marl or Chalk)
Calcium Carbonate (CaCO3)
sedimentary
Halite
Sodium Chloride (NaCl)
Mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Note: Item is not a geological specimen
Polyester mesh and Ethylene-vinyl acetate (EVA) polymer
Synthetic / Anthropogenic Material
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Red Jasper (with Chert/Quartz)
Silicon Dioxide (SiO2)
sedimentary
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Yellow Quartz Pebble
SiO2 (Silicon Dioxide) with Iron Impurities
mineral
Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)
Mixed Silicates and Sulfides (SiO2, FeS2)
mineral
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
River Pebbles (White Quartz and Basalt mix)
Mixed Clastic Sedimentary Assemblage (SiO2 and Mafic Volcanics)
sedimentary
Desert Varnish (on Sandstone)
Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion (FeCO3 or Fe2O3)
sedimentary
Fossil Crab
Decapoda (likely Avitelmessus or Raninidae family)
sedimentary
Quartz (Milky Quartz)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Porphyritic Basalt
Porphyritic Basalt with Olivine phenocrysts
igneous
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Agate (Dyed High-Grade Polished Slice)
Silicon dioxide (SiO2), Chalcedony crystal variety
mineral
Garden Pebble (Quartzite or Limestone fragment)
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) fragment
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Olivine in Basalt (Peridotite Xenolith)
Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt
igneous
Beaded Jewelry (Assorted Gemstones)
Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ
Mineral, Jewelry
Cardstock (Paper)
Cellulose (C6H10O5)n
sedimentary (man-made)
Brachiopod Fossil
Phylum Brachiopoda (replaced by Calcite or Silica)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
River Pebble (Quartz/Sandstone)
Silicon Dioxide (SiO2) Mix
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic
Pink Tourmaline in Quartz Matrix
Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) with Quartz (SiO2)
mineral