Dyed Pink Agate Slice
Cryptocrystalline variety of Quartz (SiO2)
mineral
Category
Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)
Browse industrial byproduct (often confused with igneous rocks or meteorites) specimens identified by the Rock Identifier community.
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Barite Rose on Marcasite
Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)
mineral
Red Granite
Felsic Intrusive Igneous Rock
igneous
Porphyritic Basalt (with Augite Crystals)
Porphyritic Mafic Volcanic Rock (Fe-Mg Silicates)
igneous
Feldspar-rich Pegmatite
Granitic Pegmatite (principally KAlSi3O8)
igneous
Greenschist (Greenstone)
Greenschist (Metamorphic rock containing chlorite, actinolite, and epidote)
metamorphic
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)
igneous
Granite (Weathered)
Grano-diorite / Granite (SiO2 rich intrusive rock)
igneous
Scoria (Lava Rock)
Scoria
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Scoria (Lava Rock)
Scoria (Mafic volcanic rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Amethyst (Chevron or Banded Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Amazonite
Potassium aluminum silicate (KAlSi3O8)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Greenschist
Greenschist (Actinolite-Chlorite Schist)
metamorphic
Amethyst and Ruby in Zoisite
Silicon Dioxide (SiO2) and Anyolite (Zoisite-Hornblende-Ruby mix)
mineral and metamorphic rock
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Quartz (likely milky/gray variety)
Quartz (SiO₂)
Mineral
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Agate Slices and Clear Quartz Points
Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Citrine (likely Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Granite (tumbled pebble)
Granite (Plutonic Igneous Rock)
Igneous Rock
Marble
Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)
Metamorphic Rock
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Basalt
Basalt (principally Plagioclase and Pyroxene)
igneous
Vesicular Basalt (Scoria)
Vesicular Basalt
igneous
Pink Granite
Phaneritic plutonic rock (dominated by Alkali Feldspar)
igneous
Granite
Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).
igneous
Sugilite
KNa2(Fe,Mn,Al)2Li3Si12O30 (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)
mineral
Arsenopyrite in Quartz Matrix
Arsenopyrite (FeAsS) with Quartz (SiO2)
Mineral in a Metamorphic/Hydrothermal rock
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide with trace Iron (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz Vein (Iron-stained)
Silicon Dioxide (SiO2) with limonite/hematite staining
mineral
Granodiorite (or Granite) Pebble
Phaneritic Felsic Igneous Pebble
igneous