Quartz with Mica inclusions (Gold-colored Mica)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (Phlogopite/Muscovite) inclusions
Mineral
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
Banded Agate (specifically Moss Agate or Plume Agate variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Mica (Muscovite)
Muscovite, KAl2(AlSi3O10)(OH)2
Mineral
Ferro-silicate Slag
Industrial Vitrified Slag (High-silica amorphous glass)
Mineral byproduct (Anthropogenic)
Dalmatian Stone
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Limonite-stained Granite
Felsic Plutonic Rock with Hydrated Iron Oxides
igneous
Basalt with Vesicular Texture (Beach Cobble)
Vesicular Basalt (Aphanitic Igneous Rock)
igneous
Schist with Quartz/Mica
Mica Schist (primarily Muscovite and Quartz)
Metamorphic
Amethyst
Amethyst (SiO2 - Silicon Dioxide with Iron impurities)
mineral
Bloodstone (Heliotrope)
Chalcedony (SiO2) with inclusions of Iron Oxide or Red Jasper
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
mineral
Diorite (Salt and Pepper Rock)
Diorite
igneous
Ferruginous Sandstone (Grit)
Clastic Sedimentary (Ironstone-rich Sandstone)
sedimentary
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Pink Granite
Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)
Igneous
Quartz with Muscovite Mica
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Chrysocolla on Quartz/Rhyolite matrix
Hydrated copper phyllosilicate mineral: (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Basalt (Weathered/River worn)
Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)
igneous
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
Schist
Mica Schist (contains muscovite/biotite and quartz)
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Dragon Vein Agate
Chalcedony (Quartz) - SiO2
mineral
Metal Alloy (Likely Pewter or Sterling Silver)
Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).
Man-made material (metal)
Diorite (Salt and Pepper Rock)
Diorite
igneous
Ferruginous Quartz (Iron-stained Quartzite)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
metamorphic
Kyanite (within Quartz)
Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)
metamorphic
Granodiorite
Granodiorite (phaneritic intrusive igneous rock)
igneous
Bismuth
Bismuth (Bi)
mineral
Muscovite Mica in Quartz Matrix
Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz (SiO2)
mineral
Basalt with Iron Oxidation
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Basalt with Vesicles
Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)
igneous
Sandstone (Greywacke/Lithic Sandstone)
Arenite / Lithic Sandstone
sedimentary
Granite (Weathered)
Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)
igneous
Granitic Pegmatite
Phaneritic Granite with Potassium Feldspar (KAlSi3O8), Quartz (SiO2), and Plagioclase
igneous
Green Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Biotite Schist
Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Citrine (likely Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Sandstone (Micaceous Sandstone)
Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)
sedimentary