Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
sedimentary
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.
Aquamarine on Feldspar Matrix
Beryl (Be3Al2Si6O18) with Potassium Feldspar (KAlSi3O8)
mineral
Quartz (on matrix)
Quartz (Silicon Dioxide, SiO₂)
Mineral
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)
igneous
Sandstone (Pebble)
Arenite / Clastic Sedimentary Rock
sedimentary
Andesite Porphyry
Porphyritic Andesite (Intermediate volcanic rock)
igneous
Greywacke with Quartz Veins
Lithic Sandstone (Greywacke) with SiO2 inclusions
sedimentary
Aquamarine with Quartz
Beryl (Be3Al2Si6O18) with Quartz (SiO2)
mineral
Orbicular Jasper (Ocean Jasper tendency)
Silicon Dioxide (SiO2) with impurities
sedimentary
Rhyolite
Rhyolite
igneous
Pegmatite with Smoky Quartz and Feldspar
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8)
igneous
Graphic Granite
Graphic Granite (variety of Pegmatite)
igneous
Basalt with Quartz/Calcite Inclusions
Mafic Volcanic Rock (Fe-Mg silicate rich)
igneous
Quartz-veined Mudstone or Argillite
SiO2 (Quartz) in Siltstone/Mudstone matrix
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt with Secondary Infilling (e.g., Agate, Quartz, or Zeolite)
igneous
Granitic Pegmatite with Schorl Tourmaline
Granitic Pegmatite (Schorl: NaFe3Al6(BO3)3Si6O18(OH)4)
igneous
Basalt with Jasper Veining
Basaltic Rock with Cryptocrystalline Quartz (SiO2)
igneous
Porphyritic Basalt (likely Chinese Writing Stone)
Porphyritic Basalt / Plagioclase Feldspar in Basal Matrix
igneous
Greywacke (likely)
Greywacke (a type of sandstone)
Sedimentary
Unknown Rock Specimen
igneous
Quartz
Silicon dioxide (SiO2)
mineral
Basalt with Quartz Vein
Basalt (SiO2 vein inclusion)
igneous
Fluorite in Matrix
Fluorite (CaF2) within a host rock matrix
Mineral
Orbicular Jasper (Ocean Jasper or Poppy Jasper variant)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
K2 Jasper (Beads)
Granodiorite with Azurite and Malachite
igneous
Quartz (Crystal/Druzy Quartz)
Quartz (SiO₂)
Mineral
Granitic Pegmatite (Muscovite and Quartz)
Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)
igneous
Pegmatite (Granitic)
Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)
igneous
Quartz Vein in Host Rock (clastic sediment)
Silicon Dioxide (SiO2) in matrix
sedimentary
Granite
Granite
Igneous
Pegmatite with Schorl (Black Tourmaline) and Mica
Pegmatite (complex association of NaAlSi3O8, NaFe3Al6(BO3)3Si6O18(OH)4, and KAl2(AlSi3O10)(OH,F)2)
igneous
Sandstone (Quartzose Pebble)
Clastic Sedimentary Rock (Litharenite/Quartz arenite)
sedimentary
Porphyritic Basalt (with Quartz or Calcite inclusion)
Porphyritic Basalt (Matrix: SiO2/MgO/FeO, Phenocryst: likely Quartz or Calcite)
igneous
Dalmatian Stone
Dalmatian Jasper (Aplitic Rock)
igneous
Graphic Granite
Graphic Granite (Granite Pegmatite)
igneous
Amygdaloidal Basalt
Basalt with secondary amygdule minerals (likely Epidote or Chlorite)
igneous
Sandstone with Magnetite and Iron Staining
Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)
sedimentary
Sandstone (likely Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Granite
Granite
igneous
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Dalmatian Stone (often misnamed Dalmatian Jasper)
Aplite (with hornblende/arfvedsonite inclusions)
igneous
Schist with Biotite and Quartz
Biotite-Quartz Schist (Fe,Mg,Al silicate mix)
metamorphic