Greenstone Porphyry
Altered Porphyritic Andesite/Basalt
igneous
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
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Greenstone (Greenstone River Pebble)
Greenschist (metamorphosed mafic igneous rock)
metamorphic
Scoria
Scoriaceous Basalt
igneous
Sandstone
Arenite
sedimentary
Fluorite on Matrix
Calcium Fluoride (CaF2)
mineral
Peridot gemstone pendant
Olivine, gem-quality forsteritic olivine (approximately (Mg,Fe)₂SiO₄)
gemstone
Porphyritic Basalt
Amygdaloidal Porphyritic Basalt
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Quartz-veined Basalt
Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein
igneous
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Diorite (Salt and Pepper Rock)
Phaneritic Plutonic Diorite; chemical composition roughly 52-63% silica (SiO2)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (lithic wacke/conglomerate mix)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Clear Quartz (Faceted)
Silicon Dioxide (SiO2)
gemstone
Schorl (Black Tourmaline) in Pegmatite
Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Extrusive Igneous Rock
igneous
Amygdaloidal Basalt with Agate/Quartz Infill
Basalt with Secondary Silicate Mineralization (SiO2)
igneous
Milky Quartz with Garnet/Hematite and Basalt
Silicon Dioxide (SiO2) with Almandine (Fe3Al2Si3O12) and Basalt
mineral
Scoria
Scoria (Vesicular Basaltic Rock)
igneous
Diorite
Intermediate intrusive igneous rock
igneous
Sandstone (Quartzite Pebble)
Arenite (primarily SiO2)
sedimentary
Blue Sapphire
Corundum (Al2O3) with iron and titanium impurities
mineral
Red Sandstone
Arenite (Iron-rich)
sedimentary
Greenstone / Greenschist
Greenschist (metamorphosed mafic rock)
metamorphic
Banded Sedimentary Rock
Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Intrusive Igneous Rock
igneous
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt or Porphyritic Andesite
igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)
igneous
Sandstone Pebble
Arenite (SiO2 complex)
sedimentary
Pumice
Vesicular volcanic glass
igneous
Peridot (Olivine)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Granite Sand (Decomposed Granite)
Grus / Quartz-Feldspar Detritus
sedimentary
Felsic Igneous Rock (likely Rhyolite or weathered Granite)
Felsic Volcanic/Plutonic Rock
igneous
Granite
Granite (Felsic intrusive igneous rock)
igneous