Ferruginous Quartz (Iron-stained Quartzite)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
metamorphic
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Dyed Howlite (simulating Lavender/Purple Jade or Charoite)
Howlite: Ca2B5SiO9(OH)5 (when natural)
Mineral
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene minerals)
Igneous
African Turquoise
Teal Jasper (Macro-crystalline Quartz/Sio2 + Inclusions of Copper, Iron, and Manganese)
sedimentary
Chert
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Basalt with Vesicular Texture (Beach Cobble)
Vesicular Basalt (Aphanitic Igneous Rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Basalt Pebble with Epidote/Olivine
Vitreous Basalt (SiO2 with Ca/Mg/Fe silicates)
igneous
Pink Granite (Potassium-rich Granite)
Phaneritic Felsic Igneous Rock (primarily SiO2, Al2O3, K2O)
Igneous
Granite (Weathered)
Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)
igneous
Granitic Pegmatite
Phaneritic Granite with Potassium Feldspar (KAlSi3O8), Quartz (SiO2), and Plagioclase
igneous
Seraphinite
Clinochlore (a variety of the chlorite group)
mineral
Crackle Quartz (Dyed)
SiO2 (Silicon Dioxide) - Treated
mineral
Ruby in Fuchsite
Corundum (Al2O3) in Fuchsite (K(Al,Cr)3Si3O10(OH)2)
Mineral
Basalt (Weathered/River worn)
Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Puddingstone (specifically Gowganda Tillite or St. Joseph Island Puddingstone)
Jasper Conglomerate
sedimentary
Basalt
Basalt
igneous
Amygdaloidal Basalt
Vesicular Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)
igneous
Sandstone (Greywacke/Lithic Sandstone)
Arenite / Lithic Sandstone
sedimentary
Lepidolite (likely)
K(Li,Al)3(Al,Si)4O10(F,OH)2 (Phyllosilicate mineral, part of the mica group)
Mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Chert (specifically Flint or Gray Chert)
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Basalt
Extrusive mafic igneous rock
igneous
Basalt
Basalt
igneous
Red Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Vesicular Basalt
Vesicular Basalt (Aphanitic Mafic Rock)
igneous
Quartz Vein in Mica Schist
Quartz (SiO2) with Muscovite/Biotite Schist
metamorphic
Schist (Graphite or Mica rich)
Crystalline Schist (often containing Muscovite, Biotite, or Graphite)
metamorphic
Chert Breccia (with Iron Staining)
Microcrystalline Quartz (SiO2) with iron oxides (Limonite/Goethite)
sedimentary
Sea Glass (Teal/Turquoise)
Amorphous Silica (SiO2) with trace metal oxides
Anthropogenic (Man-made material processed by nature)
Ferruginous Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Sandstone Concretion
Clastic Sedimentary Rock - Quartz Arenite / Sandstone
sedimentary
Basalt
Extrusive Mafic Igneous Rock
igneous
Granite Cobble
Felsic intrusive igneous rock (composition: SiO₂ with KAlSi₃O₈, NaAlSi₃O₈, and CaAl₂Si₂O₈)
igneous
Granitic Gneiss
Gneiss (Polymetamorphic Granitic Gneiss)
metamorphic
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral