Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)
Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)
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.
Peridot in Basalt
Olivine ((Mg, Fe)2SiO4) in Basalt
mineral
Sandstone Concretion
Septarian or Carbonate-cemented Sandstone Concretion
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
![Arfvedsonite in Quartz (Arfvedsonite [Na3(Fe2+4Fe3+)Si8O22(OH)2] often hosted in Quartz or Feldspar) — igneous](https://media.rockidentification.com/5af4c6b0-6733-4f77-a6ae-987848327128-thumbnail.jpg)
Arfvedsonite in Quartz
Arfvedsonite [Na3(Fe2+4Fe3+)Si8O22(OH)2] often hosted in Quartz or Feldspar
igneous
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Olivine in Basalt (Peridotite Xenolith)
Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt
igneous
Garnet (Pyrope-Almandine series)
Garnet Group, (Mg,Fe)3Al2Si3O12
mineral
Quartzite River Rock with Dendrites
Metamorphosed Quartz-rich Sandstone with Manganese Oxide (MnO2) inclusions
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chondrite Meteorite
Ordinary Chondrite (OC)
igneous
Sandstone (with manganese staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Olivine (Peridot)
Olivine Group (Mg,Fe)2SiO4
mineral
Scoria with Calcite Infills
Vesicular Basalt with secondary Calcification (CaCO3)
igneous
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Sandstone Concretion
Sandstone (Sedimentary Rock) with silica or calcite cement
sedimentary
Dendritic Opal
Opalized Chalcedony with Manganese Inclusions (SiO2 · nH2O)
mineral
Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Mineraloid / Industrial Byproduct
Dendritic Agate (Tree Agate)
Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (mica)
Mineral (variety of Quartz)
Iron Meteorite
Siderite (Iron-Nickel Meteorite)
mineral
Dendritic Agate (Tumbled)
Silicon Dioxide (SiO2) with inclusions
mineral
Green Glass Slag
Amorphous Silicon Dioxide (SiO2) with metal oxide impurities
mineraloid (man-made)
Olivine (Peridotite/Dunite)
Olivine (Mg,Fe)2SiO4 within Peridotite
igneous
Tektite (Indochinite)
Tektite (High-silica natural glass)
igneous
Iron Meteorite
Iron-Nickel Meteorite (primarily composed of kamacite and taenite alloys)
Mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Iron Meteorite
Siderite (Iron-Nickel Alloy), predominantly Kamacite and Taenite (Fe, Ni)
mineral
Lunar Meteorite (Feldspathic Breccia)
Lunar Achondrite (Regolith Breccia)
igneous
Sandstone (Banded)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Concretion
Septarian concretion (likely containing Calcite or Siderite)
sedimentary
Olivine (Peridot when gem-quality)
Magnesium Iron Silicate, (Mg,Fe)2SiO4
Mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Ferruginous Quartz (Iron-Stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Diorite
Phaneritic Intermediate Igneous Rock
igneous
Dalmatian Stone
Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock
igneous
Chondrite Meteorite
L or H type Ordinary Chondrite
igneous
Iron Meteorite
Iron-nickel alloy (primarily kamacite and taenite)
Meteorite (extraterrestrial material)