Gabbro (River Cobble)
Gabbro (mafic intrusive rock)
Category
Browse igneous or sedimentary specimens identified by the Rock Identifier community.
Gabbro (River Cobble)
Gabbro (mafic intrusive rock)
Rough Citrine Quartz
Citrine (Silicon Dioxide, SiO2 with iron impurities)
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
Quartz (on matrix)
Quartz (Silicon Dioxide, SiO₂)
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Quartz (Float/Abraded)
Quartz (SiO₂)
Pyrite
Iron Pyrite (FeS2)
Fluorite Bracelet (light green beads) and possibly Lavender Jadeite (purple bead)
Fluorite: CaF₂ (Calcium Fluoride); Jadeite: NaAlSi₂O₆ (Sodium Aluminum Silicate)
Granite
Granite (Phaneritic Igneous Rock)
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
Amygdaloidal Basalt
Vesicular-Amygdaloidal Basalt (Mafic Extrusive)
Olivine in Basalt matrix
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
Milky Quartz
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Granite (River Cobble)
Granite (rich in feldspar, quartz, and biotite)
Milky Quartz
Silicon Dioxide (SiO2)
Diorite
Diorite (Intermediate intrusive igneous rock)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Granite
Felsic intrusive igneous rock
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
Granite
Granite (Phaneritic Quartz-Feldspar rock)
Granite Pebble
Granite
Granite
Granite
Dalmatian Jasper
Peralkaline rhyolite with Arfvedsonite inclusions
Pink Granite
Phaneritic Plutonic Igneous Rock (high K-feldspar)
Granite
Phaneritic Plutonic Felsic Rock
Granite
Phaneritic Felsic Igneous Rock (Granite)
Granite
Intrusive igneous felsic rock
Sandstone
Arenite (predominantly SiO2 with iron oxides)
Quartz with Muscovite Mica
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride (KAl2(AlSi3O10)(F,OH)2)
Yellow Agate
Silicon Dioxide (SiO2)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
Hypersthene
Hypersthene (Magnesium Iron Silicate - (Mg,Fe)SiO3)
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
Sodalite
Na8(Al6Si6O24)Cl2
Sandstone
Arenite
Sandstone
Clastic Sedimentary Rock (composed mostly of SiO2)
Sodalite
Sodalite (Na4Al3Si3O12Cl)
Granite
Granite (Phaneritic Igneous Rock)
Shale
Argillite / Shale