Porphyry (Flower Stone)
Porphyry (Andesite or Basalt matrix)
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.
Libyan Desert Glass
Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)
mineral (Tektite/Impactite)
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Basalt with Granite Inclusions (Xenoliths)
Mafic igneous rock (Basalt) with Sialic minerals
igneous
Garnet
Almandine formula: Fe3Al2(SiO4)3
mineral
Quartz (Water-worn pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Peridot
Olivine (specific variety: gem-quality forsterite), (Mg,Fe)2SiO4
Mineral
River Cobble (Basaltic/Andesitic)
Mafic Igneous Porphyritic Rock
igneous
Quartz / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite (specifically Pink or Alkali Feldspar Granite)
Felsic Plutonic Rock (primarily SiO2 with KAlSi3O8)
igneous
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Aqua Aura Quartz
Silicon Dioxide (SiO2) bonded with Gold (Au)
mineral (treated)
Amphibolite (specifically Hornblende Schist/Gneiss)
Amphibole-rich Metamorphic Rock
metamorphic
Diorite (River Cobble)
Intermediate plutonic igneous rock
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Green Apophyllite and Stilbite on Quartz Cluster
Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)
Mineral
Snowflake Obsidian
Spherulitic Volcanic Glass (SiO2 + impurities)
igneous
Granitic Gneiss
Gneiss (Metamorphic rock of granitic composition)
metamorphic
Agate (specifically Carnelian or Honey Agate)
Silicon Dioxide (SiO2)
Mineral
Granite
Granite (Felsic intrusive igneous rock)
igneous
Granitic Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)
Igneous
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Silver (Sterling Silver Jewelry)
Argentum (Ag) mixed with Copper (Cu)
mineral
Quartz / Vein Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Vein with Iron Staining
Silicon Dioxide (SiO2)
mineral
Milky Quartz/Clear Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Rough Corundum (likely Sapphire/Zircon-bearing)
Aluminium Oxide (Al2O3)
mineral
Basalt with Calcite Veins
Basalt (containing CaCO3 inclusions)
igneous
Gneiss (specifically a Granitic Gneiss)
Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)
metamorphic
Gneiss
Gneissic Metamorphic Rock
metamorphic
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Ferruginous Quartzite (Red Chert/Jasper-like)
Metamorphosed Quartzite with Hematite inclusions (SiO2 + Fe2O3)
metamorphic
K2 Jasper (Beads)
Granodiorite with Azurite and Malachite
igneous
Opalite
Synthetic Glass (Simulated Opal)
mineral
Epidote
Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Chert (with Manganese Dendrites)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Biotite Schist
Biotite-rich Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous