Pink Granite (with Potassic Feldspar and Quartz)
Felsic Intrusive Igneous Rock (Granite)
igneous
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
Druzy Quartz on Limestone
Silicon Dioxide (SiO2)
mineral
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)
Igneous
Desert Varnish on Sandstone
Ferromanganese coating on Quartz Arenite
sedimentary
Pink Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Quartz composition)
metamorphic
Amygdaloidal Basalt with Epidote/Chlorite
Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))
igneous
Mica Schist
Muscovite/Biotite Schist
metamorphic
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Slag
Metallurgical by-product
Anthropogenic (Man-made material)
Basalt River Cobble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Biotite (Mica)
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Sandstone
Arenite (primarily composed of SiO2)
sedimentary
Granite
Phaneritic plutonic felsic rock (primarily Quartz, Feldspar, and Mica)
igneous
Scoria (Lava Rock)
Mafic extrusive volcanic rock (Scientific formula varies based on mineral content: primarily SiO2, MgO, and FeO)
igneous
Basalt with vesicles/amygdules
Basalt (containing volcanic glass and plagioclase)
igneous
Basalt with vesicles (Amygdaloidal Basalt)
Amygdaloidal Basalt (predominantly Plagioclase and Pyroxene)
igneous
Tree Agate
Silica (SiO2) with Chlorite inclusions
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Dyed Aura Quartz
Silicon Dioxide (SiO2) with metallic coating
mineral
Schist
Schist (primarily mica-schist)
metamorphic
Schist
Mica Schist (predominantly Muscovite/Biotite)
metamorphic
Sandstone
Arenite (SiO2 principal)
sedimentary
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Schist
Mica Schist (primarily Muscovite and Biotite)
metamorphic
Potassium-Rich Silicate Clay (inferred from biological context)
Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)
mineral
Mosasaur Tooth Fossil
Mosasaurid vertebrate fossil (Hydroxyapatite)
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Mica Schist
Crystalline Schist (often containing Muscovite, Biotite, and Quartz)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
Igneous
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Sandstone (primarily SiO2 with Iron Oxide cement)
sedimentary
Fuchsite (Chrome Mica)
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Titanium Aura Quartz
Titanium bonded Silicon Dioxide (SiO2 + Ti)
mineral
Quartz-veined Sedimentary Rock
Hydrothermally veined Clastic Sedimentary Rock (SiO2 veins in Matrix)
sedimentary
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)
igneous
Schist (Biotite/Mica Schist)
Medium-grade regional metamorphic rock (rich in Phyllosilicates)
metamorphic