Quartzite Pebble
Metamorphic Quartz-rich Rock (SiO2)
metamorphic
Category
Sedimentary (Secondary Mineral) Within Igneous
Browse sedimentary (secondary mineral) within igneous specimens identified by the Rock Identifier community.
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Vesicular Basalt (Scoria)
Basalt (Extrusive Igneous Rock)
igneous
Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)
Calcite
Mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Basalt with Quartz/Calcite matrix
Basalt (SiO2 with Ca/Mg/Fe silicates) on a Mineral Matrix
igneous
Breciated Chert
Brecciated Chert (Microcrystalline Quartz, SiO2)
sedimentary
Pink Granite
Phaneritic Plutonic Felsic Igneous Rock (Granite)
igneous
Amethyst
Quartz (Silicon Dioxide with Iron impurities), SiO2
mineral
Gneiss (High-grade Metamorphic Rock)
Gneiss
metamorphic
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Limonite (Yellow Ochre)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Basalt with Amygdaloidal Inclusions
Aphanitic Mafic Volcanic Rock (Basalt)
igneous
Jasper with Quartz Vein
Silicon Dioxide (SiO2)
sedimentary
Black Sapphire (Basaltic Blue Sapphire)
Corundum (Al2O3)
mineral
Amygdaloidal Basalt
Vesicular and Amygdaloidal Basalt
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive volcanic rock)
igneous
Yellow Quartz (Citrine appearance)
Silicon Dioxide (SiO2)
mineral
Blue Sapphire (Tumbled/Polished)
Corundum (Al2O3)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pink Sapphire
Corundum (Al2O3) with Chromium/Iron/Titanium trace impurities
mineral
Dalmatian Jasper
Peralkaline Quartz-feldspathic Rock (Arfvedsonite-bearing)
igneous
Gneiss
Gneiss
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Pyrite on Quartz matrix
Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Turquoise (Dyed Howlite/Magnesite imitation)
CuAl6(PO4)4(OH)8·4H2O (Target mineral) / MgCO3 (Magnesite substrate)
mineral
Hematite (Nodular or Botryoidal)
Iron(III) oxide (Fe2O3)
mineral
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Basaltic Igneous Rock
igneous
Sunstone (Feldspar variety)
Plagioclase Feldspar (Na,Ca)(Si,Al)3O8 with Hematite/Goethite inclusions
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Basalt with Quartz/Calcite Veining
Basalt (principally Plagioclase and Pyroxene)
igneous
Limonite (Ironstone)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Heulandite with Stilbite
Heulandite-Ca ((Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O) and Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (containing secondary minerals like Quartz, Zeolites, or Calcite)
igneous
Gneiss
Gneiss
metamorphic
Orange Quartz
Silicon Dioxide (SiO2) with iron inclusions
mineral