Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Category
Mineral
Browse mineral specimens identified by the Rock Identifier community.
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Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Green Aventurine
Quartz containing Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Chalcedony on Ironstone
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3/FeOOH)
sedimentary
Granite
Phaneritic Intrusive Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Stromatolite
Stromatolite (Cyanobacteria-formed Organo-sedimentary structure)
sedimentary
Sedimentary Outcrop (Sandstone/Shale)
Sedimentary bedrock formation (variable composition)
sedimentary
Gneiss (Granitic Gneiss)
Gneiss
metamorphic
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Basalt
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
igneous
Granite
Granite
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Slag (Industrial Glass Slag)
Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)
Mineraloid (Industrial byproduct)
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Vesicular Basalt
Vesicular Basalt
igneous
Basalt (Vesicular)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
Glaucophane Schist (Blueschist)
Blueschist (Glaucophane-bearing schist)
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Basalt
Extrusive mafic igneous rock
igneous
Gneiss
Gneiss
metamorphic
Basalt with Quartz/Calcite matrix
Basalt (SiO2 with Ca/Mg/Fe silicates) on a Mineral Matrix
igneous
Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)
Chalcedony (SiO2), Jasper (SiO2 with impurities)
Mineral (specifically a cryptocrystalline variety of Quartz)
Rutilated Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2 with Epidote/Tourmaline inclusions
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Limonite and Goethite (Ironstone)
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gneiss
Foliated Metamorphic Rock
metamorphic
Blue Quartzite
Quartzite (mostly SiO2 with mineral inclusions)
metamorphic
Quartz (Smoky/Milky)
Silicon Dioxide (SiO2)
mineral
Prehnite
Ca2Al(AlSi3O10)(OH)2 (Calcium Aluminum Silicate hydroxide)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Arsenopyrite with Quartz
Arsenopyrite (FeAsS)
mineral
Granite
Granitoid (dominated by Quartz and Feldspar)
igneous
Yellow Ocher (Limonite)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Chalcopyrite in Quartz (Gold Ore Matrix)
CuFeS2 (Chalcopyrite) with SiO2 (Quartz)
mineral
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)
Sandstone Pebble
Arenite (SiO2 with minor mineral cements)
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Conglomerate
Clastic Sedimentary Conglomerate (SiO2 primarily)
sedimentary