Libyan Desert Glass
Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)
mineral (Tektite/Impactite)
Category
Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite)
Browse mineral like byproduct (often mistaken for igneous rock or meteorite) specimens identified by the Rock Identifier community.
Learn about Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite) in the encyclopedia
View all →
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Amazonite
Microcline Feldspar (KAlSi3O8)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Dalmatian Stone (often misnamed Dalmatian Jasper)
Aplite (with hornblende/arfvedsonite inclusions)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Cloud Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Quartzite (Blue Aventurine / Dumortierite Quartz)
Quartzite with inclusions (SiO2 with AlAl4BSi3O18)
metamorphic
Vesicular Basalt
Vesicular Basalt (Aphanitic Mafic Igneous Rock)
igneous
Goldstone (Brown)
Aventurine glass
mineraloid (man-made)
Red Granite
Felsic Intrusive Igneous Rock
igneous
Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Hypersthene (or Enstatite/Ferrosilite)
Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)
Mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Amygdaloidal Rhyolite
Rhyolite (felsic volcanic rock) with amygdules
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (with Epidote and Feldspar/Zeolite infill)
igneous
Epidote-bearing Rock
Epidote / Silicate mineral aggregate
metamorphic
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe)
mineral
Scoria (Vesicular Basalt)
Scoria (Extrusive Igneous Rock)
igneous
Basalt Outcropping
Aphanitic Mafic Igneous Rock
igneous
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Chinese Writing Stone
Porphyritic Basalt or Porphyritic Andesite
igneous
Basalt
Extrusive igneous rock
igneous
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Gravel Pebble (Likely Quartzite or Basalt)
Quartzite (or Macrocrystalline Quartz)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Greenschist (Greenstone)
Greenschist (Metamorphic rock containing chlorite, actinolite, and epidote)
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))
metamorphic
Granite Pegmatite
Pegmatite (Fulgite / Felsic Intrusive Rock)
igneous
Amygdaloidal Basalt
Basalt (with filled vesicles/amygdules)
igneous
Greenstone
Metabasalt (composed of chlorite, epidote, and actinolite)
metamorphic
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Siltstone
Siltstone (primarily SiO2 with various silicates)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Gold Ore in Matrix
Native Gold (Au) in Quartz/Limonite host rock
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Queen Conch Shell (Biogenic Calcium Carbonate)
Aliger gigas (synonym Strombus gigas); Composition: Aragonite (CaCO3)
mineral
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary