Sunstone (Feldspar)
(Ca,Na)((Al,Si)2Si2O8) with inclusions of Hematite or Goethite
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.
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Basalt
Basalt
igneous
Serpentinite
Serpentinite (composed primarily of serpentine group minerals like lizardite, chrysotile, or antigorite; Mg3Si2O5(OH)4)
metamorphic
Green Aventurine
Silicon dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Basalt
Mafic volcanic rock (primarily plagioclase, pyroxene, and olivine)
Igneous
Schist
Metamorphic Rock (Schist)
metamorphic
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt
Extrusive Igneous Rock
igneous
Lapis Lazuli
(Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2 (Complex silicate rock)
metamorphic
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Gray Granite / Rhyolite
Felsic Igneous Rock (Granitoid)
igneous
Basalt
Basalt
igneous
Magnetite
Magnetite (Fe3O4)
mineral
Basalt
Mafic extrusive igneous rock
igneous
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Porphyritic Rhyolite (Birdseye Rhyolite)
Rhyolite (Porphyritic texture)
igneous
Wonderstone (Banded Rhyolite)
Rhyolite (Silicon Dioxide with Iron Oxide impurities)
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Garnet (likely Almandine or Pyrope)
Garnet (Group Name), Fe3Al2(SiO4)3 or Mg3Al2(SiO4)3
mineral
Red Garnet Gemstone
Pyrope-Almandine Garnet (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)
gemstone
Orange Sapphire
Corundum (Al2O3 with trace elements)
gemstone
Scoria
Extrusive Mafic Volcanic Rock
igneous
Basalt with vesicles/amygdules
Basalt (containing volcanic glass and plagioclase)
igneous
Pumice
Pumice (Amorphous volcanic glass)
igneous
Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary or igneous host
sedimentary
Fluorite Bracelet
Calcium Fluoride (CaF2)
mineral
Dalmatian Stone
Peralkaline rhyolite with arfvedsonite (formerly incorrectly called Dalmatian Jasper)
igneous
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Granite
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Granite Cobble
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
igneous
Quartz Geode
Silicon Dioxide (SiO2) in Geodic Cavity
sedimentary
Olivine (likely Peridot variety)
Olivine Mineral Group (specifically Forsterite-Fayalite solid solution series); Chemical formula: (Mg,Fe)2SiO4
Mineral
Tektite (Indochinite)
Tektite (Lechatelierite-rich silica glass)
Mineral-like (Natural Glass)
Gossan (with Limonite/Hematite coating)
Ferruginous Gossan (Fe2O3·nH2O / Fe2O3)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic glass containing Spherulitic Cristobalite (SiO2)
igneous
Quartz
Silicon dioxide (SiO2)
mineral
Siltstone
Siltstone (primarily SiO2, Al2O3)
sedimentary
Milky Quartz Pebble (Iron-Stained)
Silicon Dioxide (SiO2)
mineral