Iron Slag
Anthropogenic Vitreous Silicate (Byproduct of Smelting)
Mineral-like byproduct
Category
Mineral (Silicate Replaced Organic Material)
Browse mineral (silicate replaced organic material) specimens identified by the Rock Identifier community.
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Slag (Industrial By-product)
Glassy silicate or metallic smelting residue
mineral-like (anthropogenic)
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Moss Agate
Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide
mineral
Unakite
Epidotized Granite
metamorphic
Olivine (Peridotite)
Magnesium iron silicate ((Mg, Fe)2SiO4)
igneous
Fossilized Gastropod in Chert/Limestone
Internal mold of Gastropoda (Class) with CaCO3 or SiO2 mineral formula
sedimentary
Emerald in Matrix
Emerald (Beryllium Aluminum Silicate - Be3Al2(SiO3)6)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Serpentinite
Serpentinite (complex silicate minerals including Lizardite, Antigorite, and Chrysotile)
metamorphic
Fossiliferous Chert (with Brachiopod or Mollusk fragments)
Silicon dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions
sedimentary
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Sandstone Clast
Arenite (primarily SiO2)
sedimentary
Blue Apatite
Apatite, Ca5(PO4)3(F,Cl,OH)
mineral
Green Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
igneous
Fuchsite in Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 in SiO2
Metamorphic Rock / Mineral Association
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
metamorphic
Fossil Coral (Petoskey Stone or similar)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Blue Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Note: This is a Man-Made Object (Costume/Prop Patch)
Synthetic fiber and pigments (Cellulose/Plastic-based composite)
Non-geological
Amber
Succinite (Fossilized Tree Resin, C10H16O)
mineral
Green Moss Agate / Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions
sedimentary
Amber
Organic gemstone (Succinite is common if from the Baltic)
mineral
Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
Moss Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Beads (likely glass or man-made material)
N/A (artificial material)
Man-made material, not a natural rock or mineral specimen
Tiger's Eye (Unpolished)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)
igneous
Chert / Flint
Chert (SiO2)
sedimentary
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (Mineral composition: Bio-apatite/Calcium Phosphate replaced by various minerals)
sedimentary (fossil)
Sandstone
Arenite
sedimentary
Slag (Industrial Glass Slag)
Amorphous Silica / Ferro-silicate Slag
mineraloid / anthropogenic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Serpentine, likely a variety of Chrysoprase (green chalcedony) or a similar translucent green mineral.
Serpentine Group Minerals (e.g., Antigorite, Lizardite) or Chalcedony (SiO2) with nickel impurities for Chrysoprase green.
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Chert (Iron-stained)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary