Blue Sapphire Crystal (Rough)
Corundum (Aluminum Oxide, Al2O3)
mineral
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
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Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Amazonite
Amazonite (KAlSi3O8); a green variety of Microcline feldspar
mineral
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite-bearing Rock
Iron Sulfide (FeS2)
mineral
Granite (specifically Pink or Alkali Feldspar Granite)
Felsic Plutonic Rock (primarily SiO2 with KAlSi3O8)
igneous
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Vesicular Basalt
Extrusive mafic igneous rock (Basalt with vesicular texture)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
mineral
Ferruginous Quartzite (Red Chert/Jasper-like)
Metamorphosed Quartzite with Hematite inclusions (SiO2 + Fe2O3)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Chert (with Manganese Dendrites)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Pyrite (on Shale/Matrix)
Iron Disulfide (FeS2)
mineral
Greenshist / Chlorite Schist
Chlorite schist (contains (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
metamorphic
Tektite (likely indochinite)
Natural silica-rich impact glass; predominantly amorphous SiO₂ with aluminum, iron, magnesium, calcium, and sodium
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Schorl (Black Tourmaline) in Granite
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
igneous
Diorite
Plutonic Igneous Rock (Intermediate Composition)
Igneous
Milky Quartz/Clear Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granitic Gneiss
Gneiss (Complex silicate composition)
metamorphic
Glacial Cobble with Granite Inclusion
Porphyritic Basalt or Andesite containing Granitic Xenolith
igneous
Quartzite (River Pebble)
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Basalt with Quartz Vein
Basalt (extrusive igneous rock with SiO2 vein inclusion)
igneous
Amphibolite / Hornblende Schist
Amphibolite
metamorphic
Basalt with Quartz Vein
Aphanitic Mafic Igneous Rock with Silicon Dioxide (SiO2) intrusion
igneous
Gneiss
Gneiss
metamorphic
Geode
Quartz / Chalcedony nodule
sedimentary
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Quartz Vein with Iron Staining
Silicon Dioxide (SiO2)
mineral
Jasper with Manganese Dendrites
Silicon Dioxide (SiO2) with Oxide Mineral Inclusions
sedimentary
Vesicular Basalt
Vesicular Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt with Calcite Veins
Basalt (containing CaCO3 inclusions)
igneous
Basalt
Mafic Igneous Rock
igneous
Quartz (Milky or Smoky variant)
Silicon Dioxide (SiO2)
mineral
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Greenstone / Greenschist
Greenschist (metamorphosed mafic rock)
metamorphic