Garnet Schist
Almandine-Muscovite Schist
metamorphic
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
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Gabbro
Phaneritic Mafic Igneous Rock
igneous
Biotite Mica
Biotite, K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Granite Cobble
Granite (Phaneritic intrusive igneous rock)
igneous
Aquamarine and clear quartz
Aquamarine (Be3Al2Si6O18), Quartz (SiO2)
Mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
metamorphic
Basalt with Quartz Veining
Mafic Volcanic Rock with Silicate Micro-veins
igneous
Basalt with Quartz/Epidote Vein
Mafic volcanic rock (formula primarily (Mg, Fe)2SiO4 and CaAl2Si2O8)
igneous
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral (man-enhanced)
Basalt
Basalt
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Moss Agate
SiO2 (Silicon Dioxide) with dendritic inclusions
Mineral
Porphyry
Porphyritic Igneous Rock
igneous
Granite
Granite (Felsic Intrusive)
igneous
Weathered basalt or mafic volcanic rock
Basalt; typically plagioclase feldspar, clinopyroxene, and often olivine or iron oxides
igneous
Basalt with Quartz/Calcite Vein
Aphanitic Mafic Volcanic Rock with Quartz (SiO2) or Calcite (CaCO3) Vein
igneous
Slag (Industrial Byproduct)
Artificial silicate/iron byproduct
Mineral description (Anthropogenic material)
Weathered iron-rich basalt or volcanic breccia
Mafic volcanic rock, likely basalt; composition dominated by plagioclase and pyroxene with iron oxides
igneous
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite (Milky Quartz Cobble)
Silicon Dioxide (SiO2)
Metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Biotite phyllosilicates)
metamorphic
Basalt with Quartz Vein
Basalt (Mafic Extrusive Igneous Rock)
igneous
Amygdaloidal Basalt
Vesicular Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)
igneous
Basalt River Pebble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Granite
Felsic Plutonic Rock (primarily SiO2, Al2O3, K2O, Na2O)
igneous
Weathered Basalt with Iron Staining
Aphanitic Mafic Volcanic Rock
igneous
Mica Schist
Mica Schist (composed mainly of Muscovite / Biotite, Quartz, and Feldspar)
metamorphic
Fuchsite
Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Quartz-veined Basalt
Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein
igneous
Moss Agate
Silicon Dioxide with inclusions (SiO2 + impurities)
mineral
Granitic Gneiss
Gneiss (Polymetamorphic Granitic Gneiss)
metamorphic
Graphite
Graphite (C)
mineral
Goldstone and Aura Quartz
Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)
Mineral/Glass Specimen
Basalt
Basalt
igneous
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene minerals)
Igneous
Mica Schist with Garnet
Garnetiferous Mica Schist
metamorphic
Basalt pebble
Basalt; primarily plagioclase feldspar, pyroxene, and often olivine
igneous
Pyrite in Gossan
Iron Sulfide (FeS2) in Ferruginous Rock
mineral
Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Iron-Stained Quartzite
Recrystallized Meta-Quartzite (primarily SiO2)
metamorphic