Porphyritic Basalt
Porphyritic Mafic Extrusive Rock
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-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
mineral
Sandstone
Arenite (SiO2 based typically)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Sandstone and Mixed Rock Assemblage
Clastic Sedimentary Rock / Quartz Arenite
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Pumice
Vesicular Rhyolite or Trachyte (High-silica volcanic glass)
igneous
Polished Hematite Tower
Hematite (Fe2O3)
mineral
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Granitoid (River Pebble)
Granite (primarily Quartz, Feldspar, and Mica)
igneous
Garnet
Almandine/Pyrope Garnet (Silicate Mineral Group)
mineral
Schist with Quartz/Mica
Mica Schist (primarily Muscovite and Quartz)
Metamorphic
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Blue Sapphire (Raw/Tumbled Corundum)
Corundum (Aluminum Oxide, Al2O3 with Fe/Ti traces)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Limonite (Ironstone)
Hydrated Iron(III) Oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Feldspar (Orthoclase / Microcline) with Quartz
KAlSi3O8 (Potassium Feldspar / Orthoclase)
mineral
Greenstone (Epidosite or Serpentinite)
Metabasalt / Epidote-Chlorite Schist
metamorphic
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Gneiss
Gneiss
metamorphic
Basalt with Quartz Veining
Mafic Volcanic Rock with Silicate Micro-veins
igneous
Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Epidosite
Epidosite (consisting primarily of Epidote Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Yellow Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Snowflake Obsidian
Hydrated Volcanic Glass with Cristobalite inclusions
igneous
Amethyst and Calcite collection
Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)
mineral
Sandstone or Mudstone
Sedimentary Rock
sedimentary
Blue Apatite
Calcium Fluorophosphate (Ca5(PO4)3F)
mineral
Milky Quartz with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous