Orthoclase (Potassium) Feldspar in Quartz
KAlSi3O8 (Potassium Aluminum Silicate)
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.
Granite
Phaneritic Plutonic Felsic Rock (major components: SiO2 and Al2O3)
igneous
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
igneous
Quartzite
Quartzite (SiO2-dominant rock)
metamorphic
Granite
Phaneritic plutonic felsic rock (primarily Quartz, Feldspar, and Mica)
igneous
Diabase (Greenstone)
Diabase (also known as Dolerite)
igneous
Prehnite
Prehnite Ca2Al2Si3O10(OH)2
mineral
Fluorite in Matrix
Fluorite (CaF2) within a host rock matrix
Mineral
Porphyritic Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Hypersthene (or Enstatite/Ferrosilite)
Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)
Mineral
Granite featuring Quartz Vein
Granite with hydrothermal silica (SiO2) intrusion
igneous
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
![Granite with Quartz Vein (Phaneritic Felsic Igneous Rock (composed of Quartz [SiO2], Feldspar, and Mica)) — igneous](https://media.rockidentification.com/50ebadd6-ed66-4e73-abce-e70c662464c5-thumbnail.jpg)
Granite with Quartz Vein
Phaneritic Felsic Igneous Rock (composed of Quartz [SiO2], Feldspar, and Mica)
igneous
Wild Horse Magnesite
Magnesite with Hematite inclusions (MgCO3)
mineral
Peridot (Olivine)
Olivine, (Mg, Fe)2SiO4
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Lava Stone and Chakra Beads
Basalt (with various mineral/synthetic beads)
igneous
Granite
Granitic intrusive igneous rock
igneous
Banded Agate (Onyx type)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Iron-stained Quartz
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Cloud Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Gold Ore in Matrix
Native Gold (Au) in Quartz/Host Rock
mineral
Gneiss (Metamorphic Rock)
Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Quartz Pebble (Citrine-colored or Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt
Vesicular Basalt (Aphanitic Mafic Rock)
igneous
Greenstone (Amygdaloidal Basalt)
Amygdaloidal Basalt (frequently composed of Plagioclase Feldspar, Pyroxene, and Olivine with Chlorite inclusions)
igneous
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe)
mineral
Biotite Mica
K(Mg,Fe)3AlSi3O10(OH)2
Mineral in a matrix (likely quartz or feldspar)
Pyrite (on Quartz/Host Rock)
Iron Sulfide (FeS₂)
mineral
Vesicular Basalt
Vesicular Basalt (Aphanitic Mafic Igneous Rock)
igneous
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary