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.

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with Fe2O3 cement)

sedimentary

Banded Gneiss

Gneiss (Metamorphic Rock)

metamorphic

Granite

Granite (Felsic Plutonic Rock)

igneous

Diorite

Diorite (Intermediate intrusive igneous rock)

igneous

Basalt

Extrusive mafic igneous rock

igneous

Coarse Sand Grain / Lithic Fragment

Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)

sedimentary

Banded Gneiss with Quartz Vein

Foliated Metamorphic Rock (Gneiss)

metamorphic

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Mineral

Sandstone

Arenite (predominantly SiO2)

sedimentary

Granite (Weathered/Oxidized)

Phaneritic Felsic Igneous Rock (composed of Quartz, Orthoclase Feldspar, and Mica)

igneous

Basalt (with Porphyritic/Vesicular texture)

Extrusive mafic igneous rock

igneous

Granite

Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)

igneous

Sandstone

Arenite (SiO2 based)

sedimentary

Diorite (Dalmatian Stone variant)

Phaneritic Plutonic Igneous Rock (Medium to Fine-grained Diorite)

igneous

Fluorite

Calcium Fluoride (CaF2)

mineral

Gneiss (with Quartz and Mica)

Gneiss

metamorphic

Pumice

Vesicular volcanic glass

igneous

Black Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

igneous

Serpentine with Quartz Vein

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4 with SiO2 veins

metamorphic

Gneiss with Quartz Vein

Gneiss containing Quartz (SiO2) filler

metamorphic

Granite

Granite (Phaneritic intrusive igneous rock)

igneous

Amethyst

Quartz variety; chemical formula: SiO₂ (silicon dioxide) with Fe³⁺ impurities

Mineral

Sandstone (Quartzite Pebble)

Arenite (SiO2)

sedimentary

Quartz (Milky Quartz/Citrine Type)

Silicon Dioxide (SiO2)

mineral

Mica Group Minerals

There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).

Mineral