Milk Quartz (Common White Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Mineral Composite
Browse mineral composite specimens identified by the Rock Identifier community.
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Garden Quartz (Lodalite)
Silicon Dioxide (SiO2) with various inclusions
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Amethyst (Chevron or Banded variety)
Silicon Dioxide with Iron impurities (SiO2)
mineral
Rough Diamond
Diamond (pure carbon / C)
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss (River Cobble)
Gneiss (Foliated Metamorphic Rock)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Prehnite
Calcium aluminum silicate hydroxide - Ca2Al(AlSi3O10)(OH)2
mineral
Cloudy Quartz (or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Black Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Sapphire (Corundum)
Corundum (Al2O3)
mineral
Pegmatite (Granitic) with Tourmaline
Granitic Pegmatite (containing Schorl and Quartz)
igneous
Granitic Pegmatite
Pegmatite (composed primarily of Quartz, Feldspar, and Muscovite mica)
igneous
Schist
Lepidoblastic Mica Schist
metamorphic
Porphyry (likely Porphyritic Andesite or Basalt)
Porphyritic Igneous Rock
igneous
Quartz in Basalt (Xenocryst)
Silicon Dioxide (SiO2) in Mafic Igneous Volcanic Rock
Igneous
Goldstone (Brown/Gold variety)
Aventurine Glass (SiO2 with Copper inclusions)
Synthetic/Man-made glass (often mistaken for a mineral)
Basalt with Amygdaloidal Inclusions
Aphanitic Mafic Volcanic Rock (Basalt)
igneous
Banded Iron Formation (BIF) / Tiger Iron variety
Banded Iron Formation (predominantly Hematite, Magnetite, and Chert/Quartz - SiO2 + Fe2O3)
sedimentary
Red Granite
Phaneritic Felsic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Mineraloid / Industrial Byproduct
Giallo Ornamental Granite
Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Granite
Phaneritic Plutonic Felsic Rock (KAlSi3O8 - SiO2 - NaAlSi3O8)
igneous
Granite (Alkali-feldspar rich)
Phaneritic Felsic Igneous Rock (Major components: KAlSi3O8, SiO2)
igneous
Biotite Gneiss
Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)
metamorphic
Blue Aventurine
Quartzite with Dumortierite inclusions (SiO2)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Green Aventurine
Quartzite (variety Aventurine) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Chert / Flint
Cryptocrystalline quartz (SiO2)
Sedimentary
Greenschist
Chlorite schist
metamorphic
Diorite (Salt and Pepper Rock)
Phaneritic Plutonic Diorite; chemical composition roughly 52-63% silica (SiO2)
igneous
Septarian Nodule (Septarian Dragon Stone)
Septarian concretion (composition: Calcite CaCO3, Aragonite CaCO3, and Limestone/Clay)
sedimentary
Granite
Phaneritic Intrusive Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Sandstone (Quartzite-rich Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Rutilated Quartz (beads)
SiO2 with TiO2 inclusions (Titanium Dioxide inclusions within Quartz)
Mineral
Fossilized Shark Tooth
Fossil Chondrichthyes (various genera such as Carcharias or Odontaspis)
sedimentary