Schorl (Black Tourmaline)
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Category
Mineral (Synthetic Paper And Ink Polymorph)
Browse mineral (synthetic paper and ink polymorph) specimens identified by the Rock Identifier community.
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Black Tourmaline (Schorl)
Schorl (NaFe2+3Al6(BO3)3Si6O18(OH)4)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Schorl (Black Tourmaline)
Sodium Iron Aluminum Borosilicate Hydroxide - NaFe2+3Al6Si6O18(BO3)3(OH)3OH
mineral
K2 Jasper (K2 Granite)
Granite with Azurite inclusions (SiO2 + Cu3(CO3)2(OH)2)
igneous
Diamond
Natural Diamond (Carbon, C)
gemstone
Diamond (in a jewelry setting)
Carbon (C)
mineral
Diamond (Round Brilliant Cut)
Diamond (Pure Carbon, C)
mineral
Marcasite on Agate / Sphalerite-Pyrite Agate Geode Slice
Marcasite (FeS2) / Pyrite on Quartz (SiO2)
mineral
Dyed Agate Geode Slice
Silicon Dioxide (SiO2)
mineral
Amber (and Cubic Zirconia)
Fossilized Tree Resin
mineraloid
Porphyritic Andesite (often called Chinese Writing Stone)
Porphyritic Basaltic Andesite with Feldspar Phenocrysts
igneous
![Kaolin (China Clay) (Kaolinite [Al2Si2O5(OH)4]) — sedimentary](https://media.rock.id/kaolin-china-clay-2ca1699d-eb93-45f9-afe0-bc6ad740effa-thumbnail.jpg)
Kaolin (China Clay)
Kaolinite [Al2Si2O5(OH)4]
sedimentary
Dyed Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Seashell (Cone Snail Shell)
Conus sp. (Calcium Carbonate, CaCO3)
fossil
Thunder Egg (Agate Core)
Cryptocrystalline Quartz (SiO2) in Rhyolite/Perlite Matrix
mineral
Opalite (Synthetic Moonstone/Opal)
Synthetic Silica Glass
mineraloid (synthetic)
Pet Rock (Quartzite/Sandstone River Rock)
Silicon Dioxide (SiO2) mixture
sedimentary
Carved Sea Turtle Figurine (Aventurine / Quartz / Jasper)
Quartz variety (SiO2) / Polycrystalline Quartz Aggregate
mineral
Opalite
Man-made opalescent glass
gemstone
Grey Banded Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Purple Agate (Dyed Chalcedony)
SiO2 (Silicon Dioxide) with organic dyes
mineral
Agate (Geode nodule)
Cryptocrystalline Quartz (SiO2)
mineral
Sea Shell Fragment (Calcium Carbonate)
Aragonite / Calcite (CaCO3)
fossil
Agate Bookend / Quartz Geode
Silicon Dioxide (SiO2)
mineral
Cubic Zirconia (simulant) or Diamond
ZrO2 (Cubic Zirconia) or C (Diamond)
gemstone
Tumbled greenstone/chlorite-rich pebble
Likely chlorite-rich greenschist or altered basalt; exact identification requires testing
metamorphic
Opalite
Synthetic Glass (Silica-based)
gemstone
Cream Marble (Speckled)
Metamorphosed Limestone (mainly CaCO3)
metamorphic
Fossil Coral
Cnidaria Anthozoa (Fossilized)
sedimentary
Fossil Coral (Petoskey Stone / Hexagonaria)
Hexagonaria percarinata (Silicified/Calcite Replacement Coral)
fossil
Banded Agate (with Quartz Geode Center)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Banded Agate (Dyed / Polished)
Microcrystalline Quartz (SiO2)
mineral
Dyed Agate Geode
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2 / Quartz pseudomorph after wood)
fossil
Opalite
Synthetic Opalised Glass
mineraloid (synthetic)
Fossilized Coral (Petoskey Stone or Rugose Coral)
Antophyllum (Hexagonaria) or Scleractinia (CaCO3)
sedimentary
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Opalite
Man-made Glass (Synthetic Opalized Glass)
gemstone