![Arfvedsonite (often mistakenly sold as Astrophyllite) (Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]) — mineral](https://media.rockidentification.com/6e8b521a-e0bc-4cec-8657-2fd2e3051a43-thumbnail.jpg)
Arfvedsonite (often mistakenly sold as Astrophyllite)
Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]
mineral
Category
Mineral Like Byproduct
Browse mineral like byproduct specimens identified by the Rock Identifier community.
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Metal Alloy (Jewelry)
Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.
Man-made Material (jewelry, metal alloy)
Moss Agate
Chalcedony (SiO2 with inclusions)
mineral
Sandstone (with banding)
Arenite (primarily SiO2)
sedimentary
Limonite (Gozzany Iron)
Limonite (FeO(OH)·nH2O)
mineral
Pegmatite
Igneous Pegmatite (felsic intrusive rock)
igneous
Gneiss
Gneiss
metamorphic
Chrysocolla (Copper Ore matrix)
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Sandstone or Mudstone with Iron Staining
Ferruginous Sandstone/Mudstone
Sedimentary
Native Sulfur
Sulfur (S)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Epidosite (Unakite-related)
Epidosite (composed primarily of Epidote and Quartz)
metamorphic
Strawberry Quartz (Red Aventurine)
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Septarian Nodule (Dragon Stone)
Septarian Concretion (CaCO3 + MgCO3 + Clay)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Hematite)
mineral
Sandstone River Cobble
Arenite (predominantly SiO2)
sedimentary
Celestine
Celestine (Strontium Sulfate, SrSO4)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Ironstone concretion
Siderite or Limonite concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Quartz with Mica inclusions (likely Iron-stained)
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Weathered quartz-rich rock fragment
Likely quartz-bearing sandstone or granitic rock; exact identification is uncertain from the image
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Amber
Succinate (Succinite for Baltic varieties)
Organic Mineraloid
Yellow Quartz (Chalcedony or Agate)
Silicon Dioxide (SiO2)
mineral
Fulonite (Fulgurite-like)
Fulgurite (SiO2 fused silica/lechatelierite)
Metamorphic (Pseudo-igneous)
Corundum (Pink Sapphire / Ruby)
Al2O3 (Aluminum Oxide)
mineral
Quartz (Beach Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Iron-Stained)
Crystalline Silicon Dioxide (SiO2)
mineral
Amber
Succinite (specifically for Baltic amber); approximate formula C10H16O
Mineraloid
Dendritic Agate
Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix
igneous
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Jasper Marble
Silicon Dioxide (SiO2) with Impurities
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcedony replacement)
Mineral / Fossil
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Greenstone
Greenschist (metamorphosed mafic igneous rock)
metamorphic
Sandstone (Wonderstone)
Silicified Sandstone / Orthoquartzite with Liesegang rings
sedimentary