![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
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Quartz Sand (Beach Sand)
Silicon Dioxide (SiO2)
sedimentary
Serpentine
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)
metamorphic
Sandstone
Arenite (Quartz Sandstone)
sedimentary
Flint
SiO2 (Microcrystalline Quartz / Chert)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Actinolite
Ca2(Mg,Fe)5Si8O22(OH)2
mineral
Anthracite Coal
Low-grade metamorphic carbonaceous rock
metamorphic
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Crushed Limestone
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Polished tiger’s-eye
Tiger’s-eye, a chatoyant quartz variety; SiO₂ with fibrous pseudomorphic crocidolite/goethite inclusions
mineral
Bauxite (Concretionary)
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
mineral
Green glassy slag or manufactured glass bead
Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral
mineral
Milky Quartz with Dendritic Inclusions
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Diamond
Native Carbon (C)
gemstone
Schist
Mica Schist (Quartz-Muscovite-Biotite Schist)
metamorphic
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz with mica and feldspar (Pegmatite fragment)
Granitic Pegmatite (composed mainly of SiO2 with KAlSi3O8)
igneous
Agate
Agate (Silicon Dioxide, SiO2)
mineral
Efflorescence (on Clay Brick)
Crystalline salt deposits (typically Sodium Sulfate Na2SO4, Calcium Carbonate CaCO3, or Potassium Sulfate K2SO4)
Mineral precipitate (anthropogenic context)
Pegmatite
Granitic Pegmatite
igneous
Raw Diamond (Rough Uncut)
Diamond (C - pure carbon)
mineral
Graywacke (Sandstone)
Lithic Sandstone (Graywacke)
sedimentary
Bentonite Clay
Montmorillonite (Al,Mg)2Si4O10(OH)2·nH2O
sedimentary
Bentonite Clay
Montmorillonite silicate ((Na,Ca)0.33(Al,Mg)2Si4O10(OH)2·nH2O)
sedimentary
Graywacke (River Cobble)
Lithic Sandstone (Graywacke)
sedimentary
Anthracite Coal
Anthracite
sedimentary
Peridot (Olivine)
Olivine ((Mg, Fe)2SiO4)
mineral
Ruby (Faceted)
Corundum (Al2O3:Cr)
gemstone
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite / Lodestone
Magnetite (Fe3O4)
mineral
Slag (Industrial By-product)
Glassy silicate or metallic smelting residue
mineral-like (anthropogenic)
Ferruginous Slag (Iron Smelting Byproduct)
Anthropogenic Vitreous Silicate (often containing Fayalite: Fe2SiO4)
Mineraloid/Anthropogenic (Technofossil)
Tumbled chalcedony or quartz-rich stone
Microcrystalline quartz, SiO₂; possibly pale chert or chalcedony
mineral