Citrine Quartz
Silicon Dioxide (SiO2) with ferric iron impurities
mineral
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
Learn about Mineral Based Composite in the encyclopedia
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Fossiliferous Sandstone / Quartzite Pebble
Sedimentary rock with skeletal fragments (e.g., Paleozoic crinoid/brachiopod fossils)
fossil
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheets with Quartz)
metamorphic
Basalt with Quartz Veining
Basalt (Mafic Volcanic Rock) with Silicon Dioxide (SiO2) inclusions
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Greenstone / Greenschist
Chlorite schist / Epidiorite / Metabasalt
metamorphic
Basalt with Calcite Veins
Basalt (containing CaCO3 inclusions)
igneous
Diorite (Salt and Pepper Rock)
Diorite
igneous
Granite Pebble
Granite (Phaneritic Igneous Rock)
igneous
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Gray Granite / Rhyolite
Felsic Igneous Rock (Granitoid)
igneous
Granodiorite
Granodiorite (containing Quartz, Plagioclase Feldspar, Biotite, and Hornblende)
igneous
Lepidolite
Lepidolite (K(Li,Al)3(Si,Al)4O10(F,OH)2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Petoskey Stone
Hexagonaria percarinata
fossil
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Greenschist
Greenschist facies metamorphic rock
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Basalt
Basalt (Mafic Extrusive)
igneous
Vesicular Basalt with Calcification
Vesicular Basalt (Aphanitic extrusive igneous rock)
igneous
Pink Granite
Phaneritic Plutonic Intrusive Rock (Granite)
igneous
Diorite (River Cobble)
Intermediate plutonic igneous rock
igneous
Basalt
Extrusive Mafic Igneous Rock
igneous
Mica (Biotite and Muscovite) in Matrix
Potassium aluminum silicate with iron/magnesium (KAl2(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(F,OH)2)
igneous
Botryoidal Hematite (included in Quartz/Limonite matrix)
Fe2O3 (Hematite) on Quartz (SiO2) / Limonite
mineral
Green Slate Pebble (Serpentine / Greenschist Pebble)
Greenschist / Low-grade Metamorphic Rock
metamorphic
Ironstone Concretion (Moqui Marble Type)
Goethite/Hematite-cemented Sandstone Concretion
sedimentary
Diorite (Salt and Pepper Rock)
Phaneritic Plutonic Diorite (Plagioclase Feldspar + Amphibole/Biotite)
igneous
Gabbro
Gabbro
igneous
Biotite-rich mica schist
Mica schist, dominated by biotite mica (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂), with probable quartz and feldspar
metamorphic
Weathered basaltic rock (probable basalt)
Basalt; fine-grained mafic silicate rock, commonly plagioclase + pyroxene ± olivine
igneous
Schist
Mica Schist
metamorphic
Ferruginous Siltstone or Mudstone
Ferruginous Siltstone / Goethitic Sandstone
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Basalt with Quartz Veins
Basalt (SiO2 range 45-52%)
igneous
Sandstone (likely Graywacke or Arkose)
Clastic Sedimentary Rock (primarily SiO2 with various lithic fragments)
sedimentary
Sandstone (Greywacke)
Arenite / Lithic Wacke (SiO2 predominant)
sedimentary
Sandstone (likely Graywacke or Lithic Sandstone)
Clastic Sedimentary Rock
sedimentary
Quartz Conglomerate
Quartz Conglomerate (clastic sedimentary rock)
sedimentary
Likely basalt
Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine
igneous
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary