Biotite Mica
K(Mg,Fe)3AlSi3O10(OH)2
Mineral in a matrix (likely quartz or feldspar)
Category
Mineral In A Matrix (Likely Quartz Or Feldspar)
Browse mineral in a matrix (likely quartz or feldspar) specimens identified by the Rock Identifier community.
Granitic Quartz with Feldspar
Granite (composed primarily of SiO2 and KAlSi3O8)
igneous
Sandstone (likely Quartz Sandstone)
Arenite (SiO2 based)
sedimentary
Granitic Quartz (with Feldspar inclusions)
Quartz (SiO2) with Potassium Feldspar (KAlSi3O8)
igneous
Granitic Gneiss
Gneiss (containing Potassium Feldspar and Quartz)
metamorphic
Basalt with Quartz/Calcite Vein
Basalt (Mafic Volcanic Rock with secondary mineralization)
igneous
Pegmatite (Granitic) with Tourmaline
Granitic Pegmatite (containing Schorl and Quartz)
igneous
Basalt with Quartz/Feldspar Inclusions
Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining
igneous
Prase Quartz on Feldspar
Quartz (Silicon Dioxide, SiO2) with Hedenbergite inclusions on Potassium Feldspar (KAlSi3O8)
mineral
Amazonite
Triklinic Potassium Feldspar (KAlSi3O8)
mineral
Smoky Quartz in Matrix (Pegmatite)
Silicon Dioxide (SiO2) with Potassium Feldspar and Biotite mica
igneous
Granitic Pegmatite with Schorl
Granitic Pegmatite (Schorl: NaFe3Al6(Si6O18)(BO3)3(OH)3OH)
igneous
Granite Cobble
Felsic intrusive igneous rock
igneous
Smoky Quartz on Feldspar (Granite Pegmatite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
igneous
Pyrite in Matrix (likely Quartz or Schist matrix)
Iron Sulfide (FeS2)
mineral
Amazonite in Pegmatite Matrix with Smoky Quartz
K(AlSi3O8) - Microcline (var. Amazonite) with SiO2 (Quartz)
Mineral
Osumilite in Granite Matrix
(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30
mineral
Muscovite Mica (likely on Quartz/Feldspar)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Quartz (in matrix)
Quartz (SiO₂)
mineral
Basalt (with Plagioclase Phenocrysts)
Porphyritic Basalt
igneous
Amazonite
Potassium Feldspar (Microcline) - K(AlSi3O8)
mineral
Granite Pebble
Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)
igneous
Rhyolite
Rhyolite
igneous
Graphic Granite
Graphic Pegmatite
igneous
Quartz Vein in Sedimentary Rock
Silicon Dioxide (SiO2) with host Chert or Limestone
mineral
Pyrite in Matrix (likely Quartz or Coal)
Iron Sulfide (FeS2)
mineral
Epidote in Matrix (likely Amphibolite or Gneiss)
Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) in Metamorphic Matrix
metamorphic
Dalmatian Stone (Dalmatian Jasper)
Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite
igneous
Granite
Granite (a common term for a felsic intrusive igneous rock)
igneous
Feldspar-rich Quartzite
Feldspathic Quartzite (Metamorphosed Sandstone)
Metamorphic
Porphyritic Basalt (with Lath-like Phenocrysts)
Porphyritic Basalt
igneous
Graphic Granite
Graphic Granite (Quartz/Feldspar intergrowth)
igneous
Porphyritic Basalt or Andesite
Porphyritic Basalt / Andesite
Igneous
Garnet in Matrix (likely Almandine in Quartz/Mica Schist)
Almandine Garnet (Fe3Al2(SiO4)3) in Quartz-Feldspar host rock
metamorphic
Ocean Jasper (Orbicular Jasper)
Spherulitic Chalcedony/Rhyolite (SiO2)
mineral
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Garnetiferous Pegmatite
Pegmatite with Almandine Garnet and Muscovite
igneous
Granite with Mafic Inclusions
Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)
igneous
Dalmatian Jasper
Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)
igneous
Sandstone (Ferruginous)
Arenite with Iron Oxide (Fe2O3) cement
sedimentary
Porphyritic Basalt (River Rock)
Porphyritic Basalt
igneous